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Monogenetic volcanic field
Monogenetic volcanic field
Monogenetic volcanic field
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A monogenetic volcanic field is a type of volcanic field consisting of a group of small monogenetic volcanoes, each of which erupts only once, as opposed to polygenetic volcanoes, which erupt repeatedly over a period of time. The small monogenetic volcanoes of these fields are the most common subaerial volcanic landform.[1]

Many monogenetic volcanoes are cinder cones, often with lava flows, such as Parícutin in the Michoacán-Guanajuato volcanic field, which erupted from 1943 to 1952. Some monogenetic volcanoes are small lava shields, such as Rangitoto Island in the Auckland volcanic field. Other monogenetic volcanoes are tuff rings or maars. A monogenetic field typically contains between ten and a hundred volcanoes. The Michoacán-Guanajuato field in Mexico contains more than a thousand volcanoes and is exceptionally large.[2]

Monogenetic fields occur only where the magma supply to the volcano is low or where vents are not close enough or large enough to develop plumbing systems for continuous feeding of magma. Monogenetic volcanic fields can provide snapshots of the underlying region beneath the surface, and may be useful in studying the generation of magma and the composition of the mantle since the single eruption produced would match that of the chamber from which it erupted.[3] The magma supplying such fields is thought to have rapidly ascended from its source region, with only short resident times (decades or less) in shallow magma chambers.[1]

Examples

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References

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Monogenetic volcanic field

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A monogenetic volcanic field is a dispersed cluster of small volcanoes, each erupting only once over a short duration of weeks to decades, producing limited volumes typically less than 1 km³ and forming diverse landforms such as cinder cones, maars, and lava flows. These fields develop over long timescales spanning thousands to millions of years, with individual vents scattered across broad areas and erupting to intermediate magmas in various tectonic environments, including intraplate, extensional, and zones. Unlike polygenetic volcanoes that build large edifices through repeated eruptions, monogenetic fields exhibit unpredictable vent locations and eruption styles ranging from effusive to explosive, influenced by magma composition, ascent rates, and interactions with or the surface environment. The origin of monogenetic volcanic fields traces to episodic batches of mantle-derived that rise rapidly through the crust via dikes and sills, often bypassing extensive storage and , leading to compositional variations reflecting source heterogeneity or minor crustal . Fields contribute significantly to regional by filling sedimentary basins with over geological time, influencing patterns and paleoenvironmental records, and sometimes sharing sources with nearby polygenetic centers despite their smaller scale. Volcanic activity in these fields is inherently , with spatial and temporal patterns allowing but complicating hazard assessment due to the potential for new vents to open in populated areas. Notable examples include the in , covering 1,800 square miles with over 600 monogenetic vents active over 6 million years, the most recent being around 1085 CE. The in features about 50 basaltic volcanoes within an urban area, posing ongoing risks despite its young age of less than 0.5 million years. In the American Southwest, over 40 such fields with approximately 1,400 vents have erupted in the past 2.5 million years, often in extensional settings like the , highlighting their prevalence and hazard potential in continental interiors.

Overview

Definition

A monogenetic volcanic field consists of a cluster of small, individual volcanic vents or edifices, each of which experiences only a single eruptive episode during its lifetime, typically involving low-volume output over a relatively brief geological timeframe spanning from hours to a few years. In contrast to polygenetic volcanoes, which feature repeated eruptions from a persistent central conduit over thousands to millions of years, these fields represent dispersed, episodic where each vent operates independently without shared systems. This type of is characterized by the formation of small constructs such as cinder cones, maars, or fissures, driven by isolated batches rising through the crust. Fundamental to understanding monogenetic volcanic fields is the concept of a volcanic vent, defined as a fissure or opening in the Earth's surface through which magma, gases, and pyroclastic material are expelled during an eruption, leading to the construction of volcanic landforms. These vents in monogenetic settings are typically short-lived and do not develop into long-term magmatic reservoirs, reflecting limited magma supply rates often associated with intraplate or extensional tectonic environments. The terminology "monogenetic" underscores the single-eruptive nature of these features and was formalized in modern volcanological classifications, notably through the work of G. P. L. Walker, who categorized basaltic volcanic systems based on their eruptive behavior and plumbing dynamics. Monogenetic volcanic fields typically span diameters of 1 to 100 km, encompassing areas from tens to over 1,000 km², and contain dozens to hundreds of individual vents, though some larger fields may include thousands. Each vent produces eruptive volumes ranging from 0.001 to 1 km³ of , with most commonly under 0.1 km³, resulting in modest cumulative field volumes that accumulate over extended periods of between eruptions, often spanning millions of years. These metrics highlight the scattered, low-flux nature of monogenetic activity compared to more centralized volcanic provinces.

Characteristics

Monogenetic volcanic fields exhibit distinct temporal characteristics, with overall activity spanning approximately 10410^4 to 10710^7 years or more, during which individual vents erupt only once in short-lived episodes lasting from weeks to decades, without any at the same site. Eruption recurrence across the field is episodic and infrequent, typically occurring at rates of one event every 1,000 to 10,000 years, reflecting limited supply and contributing to the fields' long-term dormancy between outbursts. Spatially, vents in these fields are clustered over areas ranging from tens to more than 1,000 km², often showing alignments along fissures or random scattering, particularly in intraplate tectonic settings. Inter-vent distances commonly range from about 0.3 km to several kilometers, with mean nearest-neighbor distances varying by field but emphasizing localized clustering rather than widespread dispersion. In terms of volume and scale, the total erupted material for an entire field can range from a few km³ to hundreds or more, such as ~500 km³ in the , though individual eruptions are even smaller, typically less than 1 km³, contrasting with the larger centralized edifices of polygenetic shield or stratovolcanoes (often >1,000 km³). This modest scale per eruption underscores the low eruption rates and small magma batches involved, preventing the development of persistent plumbing systems. Compositions in monogenetic fields are predominantly to intermediate, dominated by basaltic to andesitic magmas, though rare exceptions occur; the frequent entrainment of mantle or crustal xenoliths serves as evidence for rapid magma ascent from depth with minimal differentiation. Morphologically, these fields feature small, uniform edifices such as cones or maars with heights of 10–500 m, which erode quickly due to their loose pyroclastic materials and exposure to , often leaving behind subtle topographic expressions like low-relief mounds or lava remnants.

Formation Processes

Magma Sources

Magma in monogenetic volcanic fields primarily originates from of , generating small batches of melts that ascend directly to the surface with minimal crustal interaction. These melts derive from the or lithospheric , often involving low degrees of (typically 1-15%) of spinel-bearing sources, which produce basaltic compositions characteristic of these fields. Such melting events are discrete and localized, reflecting the small-volume nature of monogenetic eruptions. Partial melting is commonly triggered by dynamic processes such as mantle plumes, which provide thermal anomalies to initiate decompression melting, or edge-driven at lithospheric edges, where lateral temperature contrasts drive and in the . Lithospheric extension in continental settings further facilitates melting by thinning the and reducing pressure, allowing asthenospheric . generation typically occurs at depths of 50-150 km, with evidence from seismic and geochemical data indicating source regions around 70-90 km in many cases. Once generated, ascends rapidly—often in days to months—via dike propagation through the crust, which limits fractional crystallization and preserves primitive signatures. This swift transit is evidenced by isotopic ratios, such as elevated ³He/⁴He values (up to 7-8 R_A) in basalts, signaling derivation from relatively undegassed, primordial mantle reservoirs. Monogenetic volcanic fields commonly form in diverse tectonic contexts, including continental rift zones where extension promotes mantle upwelling, back-arc basins associated with subduction-induced flow, and even stable cratonic interiors influenced by distant plumes or convection. Source heterogeneity within these settings leads to compositional variability across a field, as melts tap variably enriched or depleted mantle domains, resulting in differences in trace element ratios even from nearby vents. Geophysical evidence, such as seismic tomography revealing low-velocity zones in the upper mantle beneath these fields, supports the presence of partial melt or hot upwelling material at depth. Complementary geochemical indicators, like Nb/Y ratios exceeding 0.6, further link magmas to deeper, lower-degree melting sources rather than shallow crustal contamination.

Eruption Mechanisms

Eruptions in monogenetic volcanic fields are typically characterized by a range of styles, predominantly effusive Hawaiian and mildly explosive Strombolian activity, though phreatomagmatic phases can occur when interacts with or . Hawaiian-style eruptions involve the gentle of basaltic lava from fissures or vents, forming extensive flows with low gas content, while Strombolian eruptions feature intermittent bursts of gas and pyroclasts driven by in the conduit, producing cones and blankets. Phreatomagmatic explosions arise from rapid steam generation upon -water contact, leading to fine ash dispersal and or ring formation, often as an initial or intermittent phase. Many eruptions progress from effusive to more explosive styles as the vent narrows and volatile exsolution intensifies. Eruptions are initiated by the propagation of dykes from shallow crustal reservoirs, where magma overpressure exceeds the minimum compressive stress, fracturing the host rock and allowing rapid ascent of small batches (typically <0.1 km³). This dyke-driven process is influenced by regional stress fields and pre-existing fractures, enabling magma to migrate laterally before surfacing. Individual eruptions last from weeks to several years per vent, with total volumes typically less than 1 km³, as seen in the historical eruption (1943–1952), which produced ~1.4 km³ of material over nine years. Pressure buildup from exsolved volatiles, primarily H₂O and CO₂, drives the explosivity, with occurring as magma decompresses during ascent. Dissolved volatiles play a critical role in magma fragmentation, particularly at shallow depths (<1 km), where rapid leads to bubble expansion and conduit blockage, escalating eruption intensity. The of these gases follows , expressed as P=K⋅CP = K \cdot C, where PP is the , CC is the gas concentration in the melt, and KK is the Henry's constant specific to the gas-melt system; this relationship predicts that decreasing during ascent reduces , promoting exsolution and fragmentation when bubble volume exceeds ~75–80% of the . In monogenetic settings, H₂O contents of 2–4 wt% and CO₂ of 0.1–0.5 wt% in basaltic s can generate overpressures sufficient for Strombolian bursts or phreatomagmatic enhancement if external water is present. Activity often migrates sequentially along fissures or alignments due to evolving stress fields, with each vent depleting after a single eruptive cycle as local stresses relax and inhibit further ascent. This results in linear or clustered vent patterns, such as those in the , where tectonic stresses guide dyke propagation and favor new vents nearby but not at the same site. Such migration reflects the transient nature of monogenetic systems, with fields spanning thousands to millions of years but individual events remaining localized and non-repeating.

Morphological Features

Vent Types

In monogenetic volcanic fields, vents represent the surface manifestations of ascent and eruption, typically forming small, short-lived structures due to the limited supply. The primary vent types include cinder cones, spatter cones, lava domes, and fissure vents, each distinguished by their morphology, formation processes, and association with specific compositions and eruption styles. These vents often cluster in alignments that reflect underlying tectonic controls, and their diagnostic features aid in reconstructing paleostress fields and eruption dynamics. Cinder cones, also known as scoria cones, are the most common vent type in basaltic monogenetic fields, forming steep-sided edifices through Strombolian-style eruptions where gas-rich magma fragments into pyroclastic debris. These cones build up as ballistic , primarily basaltic , accumulate around the vent, reaching heights of 30 to 300 meters with slopes often exceeding 30 degrees. Their internal structure consists of layered deposits of loose lapilli and bombs, with coarser material near the base transitioning to finer layers upward, reflecting episodic explosive pulses. Examples include the cones of the in , where such features dominate due to their resistance to compared to surrounding softer . Spatter cones and lava domes represent smaller, more localized vent structures, often associated with effusive or mildly explosive activity in monogenetic settings. Spatter cones form from low-viscosity basaltic to andesitic s during localized fire-fountaining, where molten spatter welds into steep-sided agglutinate piles typically less than 10 meters high and aligned along fissures. In contrast, lava domes emerge from viscous, silica-rich s that extrude slowly, creating bulbous, steep-sided mounds through endogenous growth and exogenous flow lobes, though they are less prevalent in purely basaltic fields and more common where differentiation occurs. Both types exhibit high erosion resistance due to their welded or crystalline textures, distinguishing them from friable cinder deposits; for instance, spatter cones in the Craters of the Moon field illustrate this through their clustered, linear arrangements. Fissure vents initiate as linear cracks in the crust, facilitating broad, low-relief eruptions of fluid basaltic magmas that produce extensive flood lavas before concentrating into point vents as the eruption progresses. These vents evolve rapidly, often within hours to days, from kilometer-long s to localized cones due to dyke propagation and pressure equalization, resulting in en echelon patterns of aligned vents that reflect shear stresses. In monogenetic fields, such as the Wells Gray-Clearwater field in , initial fissure eruptions cover large areas before narrowing, leaving behind elongated depressions or chains of small cones. Diagnostic criteria for identifying and classifying vents in monogenetic fields emphasize spatial patterns and morphological indicators, including alignments of three or more vents in en echelon or linear arrays that signal crustal stress directions, and comparative resistance where cinder and spatter structures persist as topographic highs amid eroded surroundings. Vents are mapped systematically by assessing elongation (e.g., elliptical craters indicating origins) and clustering, with reliability enhanced by integrating geophysical data to confirm magmatic rather than erosional features; these criteria have been applied in fields like La Garrotxa to delineate tectonic influences on vent distribution.

Associated Landforms

Monogenetic volcanic fields feature a variety of secondary landforms resulting from effusive and explosive eruptive phases, primarily surrounding the central vents such as cinder cones or fissures. Lava flows, often basaltic in composition, emanate from these vents during effusive stages and form extensive sheet-like deposits. These flows typically exhibit pahoehoe or aa morphologies, with pahoehoe characterized by smooth, ropy surfaces and by rough, blocky textures due to varying flow rates and cooling dynamics. In many fields, such as those in the , individual flows extend 1-10 km from the vent, with thicknesses ranging from 1-20 m, influenced by topographic relief and viscosity. Surface features include cooling cracks forming polygonal patterns and tumuli—inflated mounds created by buildup beneath the crust—enhancing the rugged terrain. Pyroclastic deposits blanket the surrounding landscape from explosive events, contrasting with the coherent lava flows. Tephra falls produce widespread layers of ash, lapilli, and bombs, often forming where coarser particles settle first near the vent, fining outward to create blanket-like covers extending kilometers. Ballistics—large blocks and bombs ejected ballistically—litter the proximal zone within 1 km of the vent, while pyroclastic surges generate cross-bedded, dune-like deposits from ground-hugging currents, typically confined to within 2-5 km. These features, common in fields like the , record the intensity of Strombolian or phreatomagmatic explosions. Maars and tuff rings represent crateriform landforms from phreatomagmatic interactions, where contacts or , driving explosions. Maars are broad, shallow s (100-1,000 m in diameter, up to 200 m deep) floored by diatreme breccias—fragmented and volcanics churned upward in a funnel-shaped pipe—while tuff rings form slightly elevated rims of unconsolidated , 50-100 m high, encircling the . These structures, rimmed by loosely consolidated pyroclastic aprons of and accretionary lapilli, are prevalent in monogenetic fields with aquifers, such as the . Diameters rarely exceed 2 km, with ejecta blankets thinning radially. Post-eruptive modifications reshape these landforms through tectonic, erosional, and depositional processes, often preserving features in arid settings. Faulting along pre-existing structures displaces vents and flows, as seen in the Lunar Crater Volcanic Field where N30°E-trending faults align clusters and cause ongoing seismic activity. Fluvial carves rills and gullies into cones and flows, forming debris aprons, while eolian processes develop desert pavements on older surfaces ( rates ~0.03 mm/yr in basins). Burial by or younger sediments obscures up to 15 m of deposits in subsiding basins, though arid climates in regions like southern and maintain pristine morphologies for tens of thousands of years, as at .

Distribution and Examples

Global Patterns

Monogenetic volcanic fields occur predominantly in intraplate and extensional tectonic settings, such as continental interiors and , with a smaller proportion associated with zones. According to analyses of global volcanic databases, approximately 50% of volcanic fields, including monogenetic ones, are linked to rift and intraplate environments, while fewer than 50% occur in -related contexts. This distribution correlates with plate boundary dynamics, as documented in the Smithsonian Institution's (GVP), which catalogs volcanic features and highlights their concentration away from major convergent margins. Representative examples include intraplate fields in eastern and extensional settings in the of the . Age distributions of monogenetic volcanic fields are skewed toward the period (the last 2.6 million years), reflecting ongoing or recent activity in many regions. Radiometric dating techniques, such as potassium-argon (K-Ar) and argon-argon (⁴⁰Ar/³⁹Ar) methods, reveal clustering of eruptions, with recurrent episodes in hotspots like the East African Rift System, where volcanism has persisted over millions of years with intermittent pulses. These methods allow precise determination of eruption timelines, showing that while some fields span several million years, the majority exhibit dominantly young, post-Pliocene activity. In terms of density and scale, monogenetic volcanic fields show higher concentrations in regions like , exemplified by the extensive Newer Volcanics Province, and the western United States, where dozens of fields host thousands of vents. Global inventories, drawing from databases like the GVP, estimate hundreds of such fields worldwide, collectively covering less than 1% of Earth's surface due to their typically small areal extent (often tens to hundreds of square kilometers per field). Variations in lithospheric thickness significantly influence the frequency and distribution of these fields, with thinner lithosphere (e.g., 70-100 km in extensional zones) promoting greater and more frequent eruptions compared to thicker cratonic regions. This factor contributes to the observed clustering in tectonically active intraplate and areas, where reduced mantle rigidity facilitates magma ascent.

Notable Fields

The in , USA, encompasses over 600 monogenetic vents spread across approximately 4,800 km², with volcanic activity spanning from about 6 million years ago to the present. Most vents are cinder cones formed by single eruptions, illustrating the field's intraplate setting typical of monogenetic provinces. The youngest eruption occurred at around 1085 CE, producing a 300-m-high and extensive lava flows that blanketed over 8 km², an event witnessed and documented in oral traditions, underscoring its cultural significance to indigenous communities. This historical eruption exemplifies the sudden, localized hazards of monogenetic fields while preserving ancestral landscapes revered by the . The in features about 53 vents within a compact 360 km² urban area, making it one of the most densely populated monogenetic fields globally. Eruptions have occurred sporadically over the past 200,000 years, with the most recent at approximately 600 years ago, forming New Zealand's largest monogenetic as a shield-like structure rising 260 m above sea level and covering 5.5 km² with basaltic lava flows. This field demonstrates the challenges of monogenetic in modern settings, where vents emerge unpredictably amid , yet its basanitic and alkali basaltic compositions reflect deep mantle sources. The Chaîne des Puys in central aligns about 80 volcanic cones and domes along a 45 km northeast-southwest line, recognized as a for its intact representation of rift-related monogenetic volcanism. The field exhibits a full spectrum of features, including maars, scoria cones, and lava domes, with activity dating back to around 95,000 years ago but concentrated in the last 15,000 years. stands as the iconic 1,465-m-high trachytic dome, formed approximately 11,000 years ago through viscous lava , offering a classic example of dome-building in monogenetic settings with minimal erosion preserving its original morphology. Parícutin in , , exemplifies rapid monogenetic cone formation during its from February 1943 to March 1952, emerging from a cornfield fissure and growing into a 424-m-high scoria cone within nine years. In the first year alone, the cone reached nearly 400 m through intense Strombolian activity, ejecting and lava that buried the village of Paricutín and parts of nearby San Juan, displacing thousands and providing unprecedented real-time observations of volcanic birth. This event highlighted the field's andesitic to basaltic compositions and the transformative impact of short-lived eruptions on local landscapes and communities.

Geological Significance

Research Applications

Monogenetic volcanic fields provide valuable insights into mantle processes by acting as natural sampling sites for deep through erupted xenoliths and geochemical signatures of magmas. Mantle xenoliths entrained in basaltic lavas from these fields, often sourced from the lithospheric and asthenospheric mantle, reveal information on mantle composition, , and thermal structure. For instance, xenoliths from alkaline monogenetic eruptions exhibit and CO₂ indicative of primordial mantle reservoirs. These xenoliths, typically 5–25 cm in size but up to 80 cm, are transported rapidly during eruptions, preserving primary mantle conditions despite potential alteration during ascent. Geochemical analyses of host magmas and xenoliths further constrain melting depths and source heterogeneities, as seen in intraplate settings where variations highlight lithospheric mantle influences. In regions like , monogenetic fields associated with plume illustrate plume-ridge interactions, where excessive occurs due to the overlap of plume upwelling and spreading. Primitive melts from monogenetic table mountains, such as Kistufell, directly sample the Iceland plume, showing geochemical signatures of high-temperature influenced by ridge dynamics. These interactions produce V-shaped ridges and episodic volcanism, with numerical models linking plume pulsing to crustal thickness variations along the Reykjanes Ridge. Eruption dating in monogenetic fields contributes to paleoclimate reconstruction by correlating layers with records, enabling precise synchronization of volcanic events with climatic shifts. Tephrochronology identifies distal from monogenetic eruptions, such as those in the , which influenced regional ecosystems and climate through sulfur emissions preserved in lake sediments. For example, AMS ¹⁴C dating of plant macrofossils in layers links eruptions to climate events, providing eruption catalogs that reveal recurrence patterns. Geodetic monitoring using GPS and InSAR techniques in active monogenetic fields elucidates tectonic controls on , capturing surface deformation linked to dyke intrusion and stress fields. In the , wide-area InSAR surveys detect mm-scale displacements across monogenetic clusters, revealing time lags between deformation and seismicity during unrest episodes. These methods, complemented by continuous GPS networks, quantify strain accumulation in extensional settings, informing models of magma-tectonic interactions. Numerical modeling of dyke in monogenetic systems employs finite element analysis to simulate stress fields and ascent pathways. Such models demonstrate how mechanical layering in host rocks influences dyke arrest or eruption, with boundary element approaches quantifying in layered crust. For global synthesis, databases compiled by the IAVCEI Commission on Monogenetic Volcanism aggregate vent locations, ages, and from fields worldwide, facilitating statistical analyses of spatial patterns and eruption triggers. Recent post-2020 advances in drone-based mapping and AI enhance vent identification in monogenetic fields, addressing gaps in traditional surveys. Unmanned aerial systems (UAS) with multi-sensor payloads produce high-resolution digital elevation models for morphological classification of vents, as applied in lakes and basaltic fields. frameworks, trained on aeromagnetic and geospatial data, predict vent locations with high accuracy, enabling probabilistic forecasting in underexplored regions. By 2025, integrated drone-sonar surveys have further refined morphological analysis of structures, while advanced models using geophysical data have improved vent prediction accuracy.

Hazard Implications

Monogenetic volcanic fields present unique challenges for hazard prediction due to extended quiescence periods, often lasting thousands of years between eruptions, which obscures patterns and hinders short-term forecasting. Recurrence intervals are commonly modeled using Poisson statistics, with the rate parameter λ defined as the inverse of the mean inter-eruption interval, assuming temporally random events. For instance, in the basaltic fields of the American Southwest, rates indicate approximately one new every 1,000 to 2,600 years, though clustering can shorten effective repose times. Despite their typically small erupted volumes, monogenetic eruptions generate severe local hazards, including ballistic that can travel up to 1 km from the vent, damaging buildings and endangering lives within proximal zones. Lahars, triggered by phreatomagmatic interactions or rainfall on unconsolidated , pose flooding risks downstream, while ash fallout burdens by blanketing crops and reducing over tens of square kilometers. In urbanized fields such as , New Zealand, these effects amplify vulnerabilities, with modeled scenarios projecting evacuations of 1.4 million people, electricity outages exceeding one year, and widespread disruption to and water supplies during a hypothetical month-long event. Effective monitoring relies on geophysical networks to detect precursors like and ground deformation, which indicate ascent and can provide warnings from weeks to months prior. Probabilistic hazard maps, generated through simulations of vent locations and flow inundation (e.g., using and lava flow models), delineate risk zones for planning and evacuation. These tools incorporate historical data to estimate probabilities, such as 0.01–7.79% inundation risks in remote fields like Bolaven, . The eruption (1943–1952) in Mexico's Michoacán-Guanajuato field exemplifies rapid hazard evolution, transitioning from explosive vent opening with seismic swarms to prolonged effusive phases that buried villages and altered landscapes over nine years. Similarly, the 2021–present (as of 2025) eruptions on Iceland's Peninsula, including and nearby sites in a monogenetic-style system, underscore persistent activity with cumulative lava flows covering over 10 km² since 2021, while deglaciation-linked mantle unloading may elevate eruption frequencies in such settings.

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