Collisional Processes and Links to Episodic Changes in Subduction Zones

Hunen, Jeroen van; Miller, Meghan

doi:10.2113/gselements.11.2.119

Cited by 35 publications

(10 citation statements)

References 31 publications

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“…While on modern‐day Earth such ongoing double‐subduction‐induced trench advance may be unique to the eastern boundary of the Philippine Sea Plate, similar double‐subduction geometries have been postulated to drive the ultrarapid northward advance of India in the Paleogene prior to collision with Eurasia [ Jagoutz et al , ], and more generally during prior intraoceanic subduction of regions of the Neotethys [ Agard et al , ; van Hinsbergen et al , ; Van Hunen and Miller , ]. In this section, we develop a concept on how we may use the geological observations from Central Anatolia to constrain the kinematic evolution of the now largely subducted plate of the Neotethys of which the Alihoca ophiolite is a relict.…”

Section: Discussionmentioning

confidence: 90%

Kinematics of a former oceanic plate of the Neotethys revealed by deformation in the Ulukışla basin (Turkey)

et al. 2016

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Kinematic reconstruction of modern ocean basins shows that since Pangea breakup a vast area in the Neotethyan realm was lost to subduction. Here we develop a first‐order methodology to reconstruct the kinematic history of the lost plates of the Neotethys, using records of subducted plates accreted to (former) overriding plates, combined with the kinematic analysis of overriding plate extension and shortening. In Cretaceous‐Paleogene times, most of Anatolia formed a separate tectonic plate—here termed “Anadolu Plate”—that floored part of the Neotethyan oceanic realm, separated from Eurasia and Africa by subduction zones. We study the sedimentary and structural history of the Ulukışla basin (Turkey); overlying relics of this plate to reconstruct the tectonic history of the oceanic plate and its surrounding trenches, relative to Africa and Eurasia. Our results show that Upper Cretaceous‐Oligocene sediments were deposited on the newly dated suprasubduction zone ophiolites (~92 Ma), which are underlain by mélanges, metamorphosed and nonmetamorphosed oceanic and continental rocks derived from the African Plate. The Ulukışla basin underwent latest Cretaceous‐Paleocene N‐S and E‐W extension until ~56 Ma. Following a short period of tectonic quiescence, Eo‐Oligocene N‐S contraction formed the folded structure of the Bolkar Mountains, as well as subordinate contractional structures within the basin. We conceptually explain the transition from extension, to quiescence, to shortening as slowdown of the Anadolu Plate relative to the northward advancing Africa‐Anadolu trench resulting from collision of continental rocks accreted to Anadolu with Eurasia, until the gradual demise of the Anadolu‐Eurasia subduction zone.

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Section: Discussionmentioning

confidence: 90%

Kinematics of a former oceanic plate of the Neotethys revealed by deformation in the Ulukışla basin (Turkey)

et al. 2016

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“…Hallmarks of continental collision include lithospheric thickening and shortening, uplift and exhumation of crust, slab breakoff, diffuse volcanism, and possible delamination (van Hunen and Miller, 2015). In southeastern Anatolia, subduction of oceanic lithosphere transitioned to that of buoyant attenuated continental lithosphere in the middle to late Eocene ("soft" collision), with arrival of more typical Arabian lithosphere at the trench in the early Miocene (Ballato et al, 2011;Darin et al, 2018, and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…20 Ma (Schleiffarth et al, 2018), possibly triggered by upwelling asthenosphere associated with rollback and breakoff of the subducted portion of the Arabian plate (e.g., Keskin, 2003) and/or asthenosphere heating of delaminated or otherwise thinned lithospheric mantle beneath the overriding Eurasian plate (e.g., Pearce et al, 1990). Upwelling asthenosphere could be dynamically supporting the Anatolian Plateau at >1 km elevation, since its thin lithosphere (≤60 km; Angus et al, 2006;Delph et al, 2017) should result in lower elevations if the lithosphere is in isostatic balance (Boschi et al, 2010;Uluocak et al, 2016). However, uplift of the Anatolian Plateau interior began no earlier than ca.…”

Section: Introductionmentioning

confidence: 99%

“…11 Ma (Meijers et al, 2018a, and references therein). These events should have been contemporaneous, since slab rollback and breakoff and/or delamination of mantle lithosphere are anticipated consequences of continental collision (van Hunen and Miller, 2015), and associated asthenospheric upwelling due to mantle reorganization could lead to mantle melting and isostatic-and possibly dynamic-support of a relatively high plateau (Keskin, 2003;Şengör et al, 2003;McNab et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Melt equilibration depths as sensors of lithospheric thickness during Eurasia-Arabia collision and the uplift of the Anatolian Plateau

Reid

Delph

Schleiffarth

et al. 2019

Geology

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A co-investigation of mantle melting conditions and seismic structure revealed an evolutionary record of mantle dynamics accompanying the transition from subduction to collision along the Africa-Eurasia margin and the >1 km uplift of the Anatolian Plateau. New 40Ar/39Ar dates of volcanic rocks from the Eastern Taurides (southeast Turkey) considerably expand the known spatial extent of Miocene-aged mafic volcanism following a magmatic lull over much of Anatolia that ended at ca. 20 Ma. Mantle equilibration depths for these chemically diverse basalts are interpreted to indicate that early to middle Miocene lithospheric thickness in the region varied from ∼50 km or less near the Bitlis suture zone to ∼80 km near the Inner Tauride suture zone. This southward-tapering lithospheric base could be a vestige of the former interface between the subducted (and now detached) portion of the Arabian plate and the overriding Eurasian plate, and/or a reflection of mantle weakening associated with greater mantle hydration trenchward prior to collision. Asthenospheric upwelling driven by slab tearing and foundering along this former interface, possibly accompanied by convective removal of the lithosphere, could have led to renewed volcanic activity after 20 Ma. Melt equilibration depths for late Miocene and Pliocene basalts together with seismic imaging of the present lithosphere indicate that relatively invariant lithospheric thicknesses of 60–70 km have persisted since the middle Miocene. Thus, no evidence is found for large-scale (tens of kilometers) Miocene delamination of the lower lithosphere from the overriding plate, which has been proposed elsewhere to account for late Miocene and younger uplift of Anatolia.

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“…We demonstrate that the Archean and Proterozoic magmatic thickening events can be correlated to stages of global crustal growth when juvenile magmas are interpreted to have assimilated crust of multiple ages and different compositions such as during the formation of the supercontinents. The identified Phanerozoic stages of crustal growth appear to be specific to the northwestern Cordilleran margin and may represent periods of magmatic thickening related to the following: (1) processes and cyclicity in Cordilleran arc systems (e.g., DeCelles et al, ; Ducea et al, ); (2) juvenile magmas assimilating oceanic crust, continental crust, and sedimentary strata that have been tectonically juxtaposed in the deeper levels of collisional zones (e.g., Bouilhol et al, ; van Hunen & Miller, ); and/or (3) other regional magma/crust interactions within an evolving accretionary convergent margin (e.g., Cecil et al, ).…”

Section: Introductionmentioning

confidence: 99%

Geology, U‐Pb Geochronology, and Hf Isotope Geochemistry Across the Mesozoic Alaska Range Suture Zone (South‐Central Alaska): Implications for Cordilleran Collisional Processes and Tectonic Growth of North America

2020

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The Mesozoic Alaska Range suture zone is defined by a transition from oceanic to continental terranes and is part of a 2000-km-long tectonic boundary throughout the northern Cordillera. Surface geologic mapping of the rock types across this suture zone provides critical information about the upper crustal configuration but provides little insight into the sedimentary, igneous, and metamorphic processes that occurred in deeper levels of the collisional zone. To better constrain the timing and mantle-crust sources of collision-related magmatism, we combine U-Pb ages and Hf isotope compositions of detrital zircons from the three main components of the suture zone. U-Pb/Hf data sets from inboard, continental margin samples have Precambrian-Paleozoic ages with epsilon Hf (t) values ranging between +10 and −20. U-Pb/Hf data sets from the outboard, oceanic terrane samples have Pennsylvanian-Permian detrital zircon ages with epsilon Hf (t) values between +16 and +10. The U-Pb/Hf data set of detrital zircons from Mesozoic strata that represent intervening sedimentary basin(s) that formed between the continental margin and oceanic terranes record Precambrian-Mesozoic detrital zircon ages with epsilon Hf (t) values between +14 and −20. Results of the study document four Archean and Proterozoic global crustal magmatic events that are correlated to the tectonic growth of Laurentia. Also, three Phanerozoic magmatic events have been identified that represent more regional tectonic events. This study demonstrates that the combination of U-Pb geochronology and Hf isotope geochemistry applied to detrital zircons is a powerful tool to define sediment provenance in collisional zones and delineate episodes of global and regional magmatism along convergent plate boundaries.

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Collisional Processes and Links to Episodic Changes in Subduction Zones

Cited by 35 publications

References 31 publications

Kinematics of a former oceanic plate of the Neotethys revealed by deformation in the Ulukışla basin (Turkey)

Kinematics of a former oceanic plate of the Neotethys revealed by deformation in the Ulukışla basin (Turkey)

Melt equilibration depths as sensors of lithospheric thickness during Eurasia-Arabia collision and the uplift of the Anatolian Plateau

Geology, U‐Pb Geochronology, and Hf Isotope Geochemistry Across the Mesozoic Alaska Range Suture Zone (South‐Central Alaska): Implications for Cordilleran Collisional Processes and Tectonic Growth of North America

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