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Wilson Cycle
Wilson Cycle
Wilson Cycle
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Phases of Wilson cycle: From ten o'clock position clockwise: (10) initial pre-drift extension, (12) rift-to-drift phase, initial opening of an oceanic basin, (2 and 4) seafloor spreading, widening of the basin, (6) subduction of oceanic lithosphere, closure of the basin, (8) continent-continent collision

The Wilson Cycle is a model that describes the opening and closing of ocean basins and the subduction and divergence of tectonic plates during the assembly and disassembly of supercontinents. A classic example of the Wilson Cycle is the opening and closing of the Atlantic Ocean. It has been suggested that Wilson cycles on Earth started about 3 Ga in the Archean Eon.[1] The Wilson Cycle model was a key development in the theory of plate tectonics during the Plate Tectonics Revolution.

History

[edit]

The model is named after John Tuzo Wilson in recognition of his iconic observation that the present-day Atlantic Ocean appears along a former suture zone[2] and his development in a classic 1968 paper[3] of what was later named the "Wilson cycle" in 1975 by Kevin C. A. Burke, a colleague and friend of Wilson.[4]

Theory

[edit]

The Wilson cycle theory is based upon the idea of an ongoing cycle of ocean closure, continental collision, and a formation of new ocean on the former suture zone. The Wilson Cycle can be described in six phases of tectonic plate motion: the separation of a continent (continental rift), formation of a young ocean at the seafloor, formation of ocean basins during continental drift, initiation of subduction, closure of ocean basins due to oceanic lithospheric subduction, and finally, collision of two continents and closure of the ocean basins.[4] The first three stages (Embryonic, Young, Mature) describe the widening of the ocean and the last three stages (Declining, Terminal, and Relic Scar/Geosuture) describe the closing of the ocean and creation of mountain ranges like the Himalayas.[3]

In the 21st century, insights from seismic imaging and other techniques have led to updates to the Wilson Cycle to include relationships between activation of rifting and mantle plumes.[4] Plume-induced rifting and rifting-induced mantle upwelling can explain the high correlation of ages of large igneous provinces and the break-up age for these margins.

Atlantic Ocean Example

[edit]
A depiction of the Wilson Cycle in action. The continents are drifting apart and coming together in a cyclical fashion as shown. The Atlantic Ocean is shown to be formed from the separation of Pangaea. It was preceded, however, by the Iapetus Ocean.

A case study of the Wilson Cycle can be seen with the development of the Atlantic Ocean. Various parts of the modern day Atlantic Ocean opened at different times over the Mesozoic to Cenozoic periods following the Wilson Cycle. Seafloor spreading in the central Atlantic Ocean likely occurred around 134-126 Ma on Pan-African Orogenic and Rheic sutures. South Atlantic Ocean seafloor spreading began along the Congo-Sao Francisco Craton around 112 Ma. Following the North Atlantic Igneous Province eruptions around 55 Ma, the northern Atlantic passive margins rifted to their present state.

From the case of the Atlantic Ocean, Wilson Cycle plate margins can broadly be described as having the following attributes:

  1. Former collision zones, young, and old sutures are where continental break-up can most readily occur;
  2. Oceanic transfer faults, which can reactivate young and old sutures;
  3. Large igneous provinces, which do not always lead to continental break-up.

Supercontinent cycle

[edit]

A Wilson cycle is distinct from the supercontinent cycle, which is the break-up of one supercontinent and the development of another and takes place on a global scale. The Wilson cycle rarely synchronizes with the timing of a supercontinent cycle.[5] However, both supercontinent cycles and Wilson cycles were involved in the formation of Pangaea and of Rodinia.

The 50-year retrospective in the Geological Society of London Special Paper 470[4] provides an excellent nuanced view of how these concepts fit together. They conclude, "Whether it is termed the Wilson Cycle, or the more encompassing Supercontinent Cycle, the tectonic episodicity identified by Tuzo Wilson in his 1966 paper defines a fundamental aspect of Earth's tectonic, climatic and biogeochemical evolution over much of its history."

References

[edit]
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Wilson Cycle

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The Wilson Cycle is a fundamental concept in that describes the long-term, cyclical process of ocean basin formation through continental rifting and , followed by basin narrowing, , and eventual closure via and , repeating over intervals that have varied over Earth's history, typically 200–500 million years, with recent evidence indicating acceleration to shorter periods in more recent geological eras. This model, proposed by Canadian geophysicist J. Tuzo Wilson in 1966, provides a unifying framework for understanding Earth's crustal evolution, integrating , , and the rock cycle. The cycle begins with an embryonic stage (Stage A), featuring a stable continental craton that experiences rifting initiated by hotspots or mantle plumes, leading to an juvenile stage (Stage B) of initial divergence and faulting. As rifting progresses, a narrow basin forms in the proto-oceanic stage (Stage C), evolving into a mature divergent margin (Stage D) where creates and widens the basin, exemplified by the current . Convergence then dominates in the declining stage (Stage E), with initiating volcanic arcs and transform faults, transitioning to collision phases: island arc-continent interaction (Stage F), cordilleran-style mountain building (Stage G), and full continent-continent collision (Stage H) that sutures the basin and forms major orogenic belts like the Appalachians. The cycle culminates in a terminal stage (Stage I), restoring a stable until renewed rifting restarts the process. Wilson's original insight, questioning whether ancient oceans like a precursor to the Atlantic had closed during the Caledonian orogeny around 400 million years ago before reopening, laid the groundwork for recognizing these cycles as drivers of supercontinent assembly and dispersal. The supercontinent cycle, closely intertwined with the Wilson Cycle, involves the periodic coalescence of continents into massive landmasses such as (formed ~325 million years ago and broken up ~200 million years ago), (~950–800 million years ago), and earlier configurations like (~1.6–1.4 billion years ago), punctuated by activity, slab , and large igneous provinces. Recent studies, using detrital Hf isotope records, suggest an acceleration in Wilson cycle durations over time due to mantle cooling. These processes not only shape continental margins and mountain ranges but also influence global sea levels, atmospheric CO₂ levels, and long-term climate patterns through phases of continental insulation during assembly (promoting cooling) and dispersal (enhancing warming via increased ). Evidence from , isotopic dating, and geological records worldwide supports the model's validity, making it a cornerstone of modern .

Historical Development

Origin of the Concept

The concept of repeated opening and closing of ocean basins originated with the work of Canadian geophysicist in the mid-1960s, predating the widespread acceptance of theory later in the decade. In his seminal 1966 paper published in , Wilson proposed that the modern had formed along the remnants of an earlier, closed ocean basin known as the proto-Atlantic or , based on the alignment of major suture zones in the Appalachian and Caledonian mountain belts. These orogenic belts, formed during the Paleozoic Era, suggested a prior episode of followed by subsequent rifting, challenging the prevailing geosynclinal theory that viewed mountain building as a one-way process. Wilson supported his hypothesis with early geological evidence, including the proximity of these suture zones to ancient faunal divides—boundaries in fossil distributions that indicated past geographic separations of continents during the and periods. Paleomagnetic data from the , particularly the identification of magnetic stripe anomalies on the seafloor by and Matthews, provided corroborating support by demonstrating episodic consistent with multiple generations of ocean basins over hundreds of millions of years. These lines of evidence implied that ocean basins were not permanent features but underwent cyclic destruction and reformation, a radical departure from fixed-continent models dominant before the . In 1968, Wilson elaborated on this idea in a presentation and subsequent publication, outlining a comprehensive cyclic process that integrated rifting to initiate basin formation, to widen it, to narrow it, and to close it, ultimately leaving behind suture zones as relics. This framework emphasized the dynamic interplay of these mechanisms over geological timescales, laying the groundwork for understanding tectonic evolution. The process, later termed the Wilson Cycle in 1974, marked a pivotal shift in sciences by linking disparate observations into a unified model.

Key Milestones and Contributors

The formal naming of the Wilson Cycle took place in 1974, when John F. Dewey and Kevin C. A. Burke introduced the term in their analysis of hot spots and continental break-up, explicitly linking it to J. Tuzo Wilson's earlier proposals for the cyclic opening and closing of ocean basins outlined in his 1966 and 1968 publications. This naming encapsulated the sequence of rifting, spreading, , and collision as a fundamental aspect of Earth's tectonic evolution. Burke, in particular, continued to refine the concept through subsequent works, emphasizing its application to geology and global suture mapping. In the 1970s, the Wilson Cycle was integrated into the broader framework, with pivotal contributions from Xavier Le Pichon, whose 1968 study delineated six to seven major lithospheric plates and quantified their relative motions, providing the structural basis for understanding basin cycles. Dan McKenzie advanced this integration through his 1967 speculations on plate motion consequences and 1974 numerical models of , which demonstrated how convective flows could drive the long-term opening and closure of ocean basins over hundreds of millions of years. W. Jason Morgan's 1968 identification of transform faults as offsets along mid-ocean ridges and his 1971 proposal of deep mantle plumes as fixed hotspots further illuminated initiation mechanisms, explaining how rifting begins and how hotspots influence cycle asymmetry. Refinements in the and incorporated emerging geophysical technologies, as (GPS) networks measured present-day plate spreading rates—such as 2-10 cm/year along major ridges—validating the dynamic rates predicted by the cycle. Satellite altimetry missions, like TOPEX/Poseidon launched in 1992, mapped sea surface heights and revealed gravity anomalies over zones and ridges, confirming topographic signatures of basin evolution and cycle timings spanning 200-500 million years. These advancements solidified the Wilson Cycle's role in unifying tectonic observations. A key milestone came in 2019 with the Geological Society of London's special publication marking 50 years since Wilson's foundational ideas, which synthesized historical progress and empirical validations across disciplines.

Theoretical Framework

Phases of the Wilson Cycle

The Wilson Cycle delineates the lifecycle of ocean basins through nine sequential stages driven by plate tectonic processes, from continental rifting to closure and collision. These stages exhibit distinct geological signatures preserved in the rock record, including ophiolites (fragments of obducted onto continents), blueschists (high-pressure, low-temperature metamorphic rocks indicative of ), and reactivated faults (evidence of inherited tectonic weaknesses). The full cycle typically spans 250 to 500 million years, reflecting the timescales of and plate motion at rates of several centimeters per year. Stage A: Embryonic rift stage begins with extensional forces, often initiated by mantle plumes, causing continental to thin through normal faulting and the development of basins. accompanies this extension, producing intrusions and volcanic rocks as the crust stretches and thins. Diagnostic features include grabens filled with immature sediments and alkali basalts, as seen in the ongoing , where fault-block mountains and volcanic activity mark the early separation of continental blocks. Reactivated ancient faults may guide the rifting along zones of weakness. Stage B: Juvenile ocean stage follows as rifting progresses to initial divergence and faulting, with the continent beginning to separate and a juvenile ocean forming. Stage C: Proto-oceanic stage features a narrow basin as the rift evolves into early , where the continent fully ruptures and a narrow emerges between diverging plates. Transform faults offset the spreading ridges, and initial forms via decompression melting in . Geological signatures comprise pillow basalts, sheeted dike complexes, and thin sedimentary layers on the newly formed floor, with passive margins accumulating continental-derived sediments; ophiolite sequences often preserve this oceanic crust if later obducted. The basin remains juvenile, with limited widening and possible restricted circulation leading to evaporites. Stage D: Mature ocean basin develops as steady seafloor spreading widens the ocean, with a prominent system dominating the central axis. The ridge experiences continuous and hydrothermal activity, while abyssal plains form from accumulating pelagic s and turbidites. Key signatures include symmetric magnetic stripes in the recording polarity reversals, thick sediment piles on passive margins, and well-preserved ophiolites representing sections of the ridge and flank; no older than about 200 million years persists due to ongoing . The basin reaches maximum width, with stable divergent margins. Stage E: Declining ocean basin marks the onset of contraction, where initiates at one or both margins, often along former passive edges transformed into convergent zones. The ocean narrows as the subducting slab pulls plates together, fostering back-arc basins and initial arc volcanism. Diagnostic features encompass from cold of , accretionary prisms of scraped-off sediments, and reactivated transform faults becoming boundaries; the seafloor age gradient steepens toward the . This phase lasts approximately 200 million years before full closure accelerates. Stage F: Island arc-continent interaction involves advanced consuming oceanic lithosphere, leading to the collision of island arcs with continental margins. Convergent margin processes intensify, with deep trenches and explosive volcanism characterizing the setting. Geological signatures include obduction onto arcs, widespread blueschists and eclogites from high-pressure , and basins filled with ; reactivated faults within the arcs accommodate deformation as the ocean remnant shrinks. Stage G: Cordilleran-style mountain building features continued convergence with arc-continent interactions forming cordilleran orogens, involving and along the margin. Stage H: Continent-continent collision culminates the cycle as the ocean is fully consumed, forcing buoyant continental crusts to collide and form orogenic belts. Thrust faulting and crustal thickening dominate, with sutures marking the former ocean's trace. Diagnostic features comprise folded and thrust sedimentary sequences, high-grade in the collision zone, and reactivated continental faults propagating deformation inland; mountain belts like the Appalachians preserve these sutures, remnants, and mélanges as evidence of prior . The resulting sets the stage for the next cycle's rifting. Stage I: Terminal stage involves erosion of the to form a stable until renewed rifting.

Driving Mechanisms

The driving mechanisms of the Wilson Cycle are primarily powered by thermal convection in , which generates the forces responsible for plate motions and the cyclic opening and closing of basins. Mantle convection arises from internal heating due to and residual heat from Earth's formation, creating upwellings and downwellings that drive divergent and convergent , respectively. This process links to the stages of the cycle by facilitating rifting, spreading, , and collision through dynamic interactions between the and . A dominant force in subduction initiation and ocean basin closure is slab pull, where the negative buoyancy of cold, dense oceanic causes it to sink into , pulling the overlying plate toward the subduction zone. This mechanism sustains once initiated, often at transform faults or weakened zones, and contributes significantly to global plate velocities, with rates typically ranging from 3 to 10 cm/year. enhances slab pull by organizing downwellings around subducting slabs, as evidenced by imaging deep slab remnants. In contrast, ridge-push forces and gravitational instabilities drive and continental rifting. At mid-ocean ridges, the elevated topography due to hot, buoyant mantle upwelling creates a that pushes plates apart, while lithospheric cooling and thickening away from the ridge amplifies this effect. These forces initiate rifting during breakup, with spreading rates generally between 2 and 10 cm/year, as observed along ridges like the at approximately 2.5 cm/year. Gravitational instability further promotes divergence by destabilizing thickened continental roots during extension. Mantle plumes play a crucial role in continental breakup by impinging on the base of the , causing localized heating and weakening that promotes rifting and the formation of large igneous provinces (). These plumes, often forming 50–100 million years after assembly due to beneath assembled continents, generate voluminous that thins the lithosphere and facilitates initial separation. For instance, the is linked to a plume that aided the breakup of . Lithospheric thinning during rifting occurs through asthenospheric , where hot mantle material rises passively in response to extension or actively via plumes, reducing the mechanical strength of the overriding plate. This upwelling elevates temperatures by up to 150 K in the during dispersal phases, enabling extensional faulting and intrusion that propagate rifts. Feedback loops in the system arise from collision-induced , where thickened continental roots become gravitationally unstable post-collision, detaching and sinking into to trigger new upwellings and rifting elsewhere. This process restarts the cycle by redistributing heat and stress, linking closure in one basin to opening in another, and is dynamically coupled with ongoing . velocities, tied to overall plate motions of 1–10 cm/year, reflect this interconnectedness.

Geological Examples

Atlantic Ocean Basin

The Atlantic Ocean basin exemplifies an active Wilson Cycle, currently progressing through its rift-to-mature ocean phases following the breakup of the supercontinent Pangea. Rifting initiated in the Central Atlantic around 201 Ma, coinciding with the emplacement of the (CAMP), a that facilitated continental separation through extensive basaltic and intrusive activity across , , , and . This event marked the onset of divergence between the Americas and Eurasia-Africa, with syn-rift sedimentation and magmatism recorded in associated basins. Subsequent rifting progressed southward and northward in distinct segments. The South Atlantic began opening around 132 Ma, driven by lithospheric and MORB-like that transitioned from the earlier Paraná-Etendeka , leading to between 132 and 126 Ma in the southern segment. In the North Atlantic, divergence accelerated around 60 Ma, influenced by the —a deep that caused significant uplift and volcanism, particularly beneath eastern Greenland, and contributed to the separation of Greenland from . These phased openings reflect the progressive unzipping of Pangea along inherited weaknesses. The basin is now in a mature phase, characterized by symmetric along the at an average rate of approximately 2.5 cm per year, which continues to widen the ocean. Key evidence for this cycle includes linear magnetic anomalies symmetric about the ridge, recording reversals of Earth's geomagnetic field and confirming steady spreading since the . Transform faults, such as the Azores-Gibraltar fault zone, offset the ridge and accommodate lateral motion between plate segments, while reactivated sutures like the Appalachians influenced initial rifting by localizing extension within weakened orogenic belts. Hints of an impending decline phase include potential initiation via invasion from the arc, where a dormant subduction zone may propagate westward into the Atlantic within the next 20 million years, eventually leading to basin closure over approximately 200 million years. This process aligns with the Wilson Cycle's terminal stages, transforming the passive margins into convergent boundaries.

Tethys Ocean and Other Cases

The closure of the Tethys Ocean exemplifies a completed Wilson Cycle, involving progressive subduction that spanned from the Permian to the Miocene, ultimately leading to the formation of the Alpine-Himalayan orogenic belt around 50 million years ago (Ma). This process began with the subduction of the Paleo-Tethys branch in the Late Permian to Early Triassic, followed by the opening and subsequent closure of its successor, the Neo-Tethys, which marked a multi-phase oceanic evolution driven by plate convergence. Key events include the rifting of the Neo-Tethys around 200 Ma during the Late Triassic breakup of northern Gondwana, which separated continental fragments like Greater India from Eurasia, and the final India-Eurasia collision at approximately 50 Ma, which sutured the northern Neo-Tethys margin and initiated continental collision. These sutures, such as the Indus-Yarlung Tsangpo zone, preserve remnants of the oceanic lithosphere obducted during subduction. Geological evidence for the Tethys closure includes well-preserved ophiolite suites, such as the Semail Ophiolite in , which represent obducted Neo-Tethyan oceanic crust formed in the and emplaced during the early . High-pressure metamorphic rocks, including eclogites and blueschists in the Hellenides and Zagros ranges, indicate deep of continental margins prior to collision, with peak dated to the Eocene. Paleogeographic reconstructions, derived from paleomagnetic data and stratigraphic correlations, confirm the northward drift of Gondwanan blocks across the widening Neo-Tethys before its , aligning with the timing of arc magmatism and sediment provenance shifts. Other notable examples of completed Wilson Cycles include the , which opened in the late to early and closed during the mid- (approximately 450–390 Ma), resulting in the Appalachian-Caledonian orogenic belts through the collision of , , and . Similarly, the Proto-Tethys Ocean, an early basin separating East Asian cratons like and Tarim from , underwent closure between 500 and 420 Ma via northward , leading to the early orogenies in . These cases highlight how ancient ocean basins followed the full sequence of rifting, , , and continental suturing, producing linear mountain belts akin to those of the Tethys. Variations in these cycles are evident in asynchronous closures, particularly in multi-arm rift systems like the Tethys, where the Paleo-Tethys closed by the while the Neo-Tethys persisted until the Eocene, reflecting differential rates and the influence of intra-oceanic arcs. Such diachroneity allowed for the sequential accretion of terranes, altering the pace of orogenic buildup compared to more synchronous closures in simpler basins.

Broader Geological Context

Relation to Supercontinent Cycles

The supercontinent cycle refers to the episodic assembly and dispersal of nearly all of Earth's continental landmasses into a single large , occurring over long timescales with an approximate periodicity of 300-500 million years between major assemblies. Notable examples include , which formed approximately 1.1 billion years ago through the collision of older continental fragments, and Pangea, which assembled around 300 million years ago during the late via the convergence of , Laurussia, and other cratons. This cycle is driven by plate tectonic processes that lead to prolonged periods of continental aggregation followed by rifting and fragmentation. The is closely intertwined with the Wilson Cycle, as the breakup of a typically initiates several overlapping Wilson Cycles in the resulting ocean basins. For example, the rifting of Pangea beginning around 200 million years ago triggered the Wilson Cycle of the Atlantic Ocean through along the , while simultaneously initiating cycles in the Indian and Pacific regions through the separation of continental blocks. These individual Wilson Cycles contribute to the broader by facilitating the long-term redistribution of continents, where dispersed fragments eventually reconverge to form a new . A key distinction lies in their scales and focuses: the Wilson Cycle emphasizes the complete lifecycle of a single basin—from rifting and spreading to and closure—typically spanning 250 to 500 million years, whereas the addresses the global orchestration of multiple such basins to achieve continental clustering on a planetary scale over hundreds of millions to billions of years. This hierarchical relationship highlights how localized tectonic processes aggregate into global geodynamic patterns. Geological evidence supporting the supercontinent cycle includes matching sutures—linear zones of ancient oceanic crust remnants—from collisional orogenies that trace former continental connections, as seen in the Pan-African sutures linking the East African Orogen to fragments of such as and . Paleomagnetic reconstructions provide additional corroboration by aligning the apparent paths of separated cratons, demonstrating their proximity during assembly phases, such as the fit of and along the South Atlantic margins derived from Pangea's breakup. Not all Wilson Cycles synchronize perfectly, contributing to the extended duration of supercontinent formation; asynchronous basin closures around the globe allow continental fragments to amalgamate progressively rather than simultaneously, as evidenced by the staggered orogenic events in the assembly of between 650 and 500 million years ago. This asynchrony underscores the complex interplay of and plate motions in driving supercontinent cycles.

Modern Insights and Predictions

Recent advancements in have illuminated deep mantle structures associated with the Wilson Cycle, including remnants of subducted slabs and interactions between mantle plumes and mid-ocean ridges. A study from the analyzed these dynamics, revealing how pre-subduction crustal damage facilitates the initiation of new zones and influences plume-ridge interactions that drive ocean basin evolution. These findings underscore the role of inherited mantle heterogeneities in perpetuating cyclic beyond surface observations. In 2024, research on the Zagros fold-and-thrust belt demonstrated its formation through multiple overlapping Wilson Cycles, involving successive phases of rifting, ocean closure, and collision from the Neo-Tethys and earlier basins. This work highlights how polyphase tectonics in collisional orogens can record stacked cycles, complicating traditional single-cycle interpretations. Concurrently, modeling of the Atlantic Ocean predicts its decline beginning approximately 20 million years from now, as the Gibraltar subduction zone invades westward, initiating crustal recycling and reversing the basin's expansion. Projections for future Wilson Cycles anticipate the formation of a new , such as Amasia or Ultima, within 200-250 million years, primarily driven by the closure of the through ongoing along its margins. These scenarios, derived from plate reconstruction models, suggest introversion or orthoversion assembly modes where the collide with or , respectively. The phases of the Wilson Cycle also exert long-term influences on Earth's by modulating atmospheric CO2 levels through enhanced during rifting and , contrasted with increased in collisional uplands that draws down CO2. assembly amplifies these effects, leading to cooler climates via expanded continental , while dispersal promotes warmer, conditions from widespread . Criticisms of the Wilson Cycle framework highlight its variability between the Archean and Phanerozoic eons, where early Earth tectonics may have involved different styles of subduction and plume activity due to hotter mantle conditions and thinner lithosphere. Recent assessments question the universality of a single, complete cycle model, emphasizing orogenic diversity and incomplete records in explaining all collisional systems. As of 2025, GPlates-based modeling has advanced integrations of Wilson Cycle dynamics into scenarios, testing mantle circulation feedbacks and plate motions to refine predictions of assembly timing and configurations. These simulations incorporate seismic and paleomagnetic data to evaluate how past cycles constrain future ones, revealing potential for hybrid introversion-extroversion paths in Pacific closure.

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