Crustal stacking and expulsion tectonics during continental subduction: P-T deformation constraints from Oman

Agard, Philippe; Searle, Michael P.; Alsop, G. Ian; Dubacq, Benoît

doi:10.1029/2010tc002669

Cited by 84 publications

(88 citation statements)

References 93 publications

(244 reference statements)

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“…Four analyses of zircon fractions from sample UK25 show some scatter which points to the presence of older inherited components. The two youngest overlapping analyses yield an average 206 Amelin and Zaitsev, 2002). The ages obtained from both samples from the intrusion are the same within error.…”

Section: U/pb Geochronologymentioning

confidence: 55%

“…The presence of glaucophane-epidote bearing rocks within the Afyon Zone (Blumenthal, 1956) and the estimated P-T conditions of the carpholite-chloritoid bearing rocks of the rest of Afyon Zone (10 kbar/375 • C; Pourteau et al, 2014) suggest that not all exhumation of the Afyon Zone can be ascribed to the activity of the Ivriz Detachment. The first phase of exhumation brought these rocks from blueschist to lower blueschist-facies conditions, perhaps as a result of channelized exhumation along the subduction zone (e.g., Agard et al, 2010;Jolivet et al, 2003). The few top-SSW shear indicators that we obtained from the foot wall formed at temperatures indicative of greenschist or lower blueschist-facies conditions.…”

Section: Extensional Exhumation History Of the Afyon Zonementioning

confidence: 92%

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A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

Gürer

Plunder

Kirst

et al. 2018

Earth and Planetary Science Letters

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Central Anatolia exposes previously buried and metamorphosed, continent-derived rocks -the Kır¸sehir and Afyon zones -now covering an area of ∼300 × 400 km. So far, the exhumation history of these rocks has been poorly constrained. We show for the first time that the major, >120 km long, top-NE 'Ivriz' Detachment controlled the exhumation of the HP/LT metamorphic Afyon Zone in southern Central Anatolia. We date its activity at between the latest Cretaceous and early Eocene times. Combined with previously documented isolated extensional detachments found in the Kır¸sehir Block, our results suggest that a major province governed by extensional exhumation was active throughout Central Anatolia between ∼80 and ∼48 Ma. Although similar in dimension to the Aegean extensional province to the east, the Central Anatolian extensional province is considerably older and was controlled by a different extension direction. From this, we infer that the African slab(s) that subducted below Anatolia must have rolled back relative to the Aegean slab since at least the latest Cretaceous, suggesting that these regions were underlain by a segmented slab. Whether or not these early segments already corresponded to the modern Aegean, Antalya, and Cyprus slab segments remains open for debate, but slab segmentation must have occurred much earlier than previously thought.

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Section: U/pb Geochronologymentioning

confidence: 55%

Section: Extensional Exhumation History Of the Afyon Zonementioning

confidence: 92%

A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

Gürer

Plunder

Kirst

et al. 2018

Earth and Planetary Science Letters

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“…Zakariadze et al, 1990). More recent works along the Neotethys domain evidence processes which include Neotethyan oceanic crust obduction and the collision-accretion of microplates to the Eurasian margin before the final Arabia-Asia collision or IndiaAsia collision (Agard, Searle, Alsop, & Dubacq, 2010;Avagyan et al, 2010;De Sigoyer, Guillot, & Dick, 2004;Ding, Kapp, & Wan, 2005;Galoyan et al, 2009;Hacker, 1991;Hacker, Mosenfelder, & Gnos, 1996;Harper, Grady, & Coulton, 1996;Okay, Tansel, & Tüysüz, 2001;Rice, Robertson, & Ustaömer, 2009;Rolland et al, 2012;Rolland, Sosson, Adamia, & Sadradze, 2011;Searle & Cox, 1999;Sosson et al, 2010;Stampfli et al, 2001;Yılmaz, Yiğitbaş, & Can Genç, 1993). In these works, the presence of several geochemical suites in a given suture zone is interpreted as the tectonic collage of petrological slivers originating from various oceanic environments: volcanic arc, oceanic islands and seamounts, oceanic crust from mid oceanic ridge or from back-arcs.…”

Section: Lesser Caucasusmentioning

confidence: 99%

Linking the NE Anatolian and Lesser Caucasus ophiolites: evidence for large-scale obduction of oceanic crust and implications for the formation of the Lesser Caucasus-Pontides Arc

et al. 2013

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In the Lesser Caucasus and NE Anatolia, three domains are distinguished from south to north: (1) Gondwanian-derived continental terranes represented by the South Armenian Block (SAB) and the Tauride-Anatolide Platform (TAP), (2) scattered outcrops of Mesozoic ophiolites, obducted during the Upper Cretaceous times, marking the northern Neotethys suture, and (3) the Eurasian plate, represented by the Eastern Pontides and the Somkheto-Karabagh Arc. At several locations along the northern Neotethyan suture, slivers of preserved unmetamorphozed relics of now-disappeared Northern Neotethys oceanic domain (ophiolite bodies) are obducted over the northern edge of the passive SAB and TAP margins to the south. There is evidence for thrusting of the suture zone ophiolites towards the north; however, we ascribe this to retro-thrusting and accretion onto the active Eurasian margin during the latter stages of obduction. Geodynamic reconstructions of the Lesser Caucasus feature two north dipping subduction zones: (1) one under the Eurasian margin and (2) farther south, an intra-oceanic subduction leading to ophiolite emplacement above the northern margin of SAB. We extend our model for the Lesser Caucasus to NE Anatolia by proposing that the ophiolites of these zones originate from the same oceanic domain, emplaced during a common obduction event. This would correspond to the obduction of nonmetamorphic oceanic domain along a lateral distance of more than 500 km and overthrust up to 80 km of passive continental margin. We infer that the missing volcanic arc, formed above the intra-oceanic subduction, was dragged under the obducting ophiolite through scaling by faulting and tectonic erosion. In this scenario part of the blueschists of Stepanavan, the garnet amphibolites of Amasia and the metamorphic arc complex of Erzincan correspond to this missing volcanic arc. Distal outcrops of this exceptional object were preserved from latter collision, concentrated along the suture zones.

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“…The Sonoma orogeny occurrence is in agreement not only with the sediment deposition gap and the Permian formation erosion but also with the occurrence of reverse faults with opposite vergence, which we interpret as formed during tectonic lateral expulsion in an orogenic border system (e.g. Agard et al 2010;Domeier and Torsvik 2014 (Ingersoll and Schweicker 1986). During this period local continental conglomerates, of small lateral dimensions and unknown ages, overlay unconformably the Upper Plomosas Formation (Gonzalez Ramirez 2005).…”

Section: Regional Geodynamical Implicationmentioning

confidence: 56%

New geological and geochronological data of the Placer de Guadalupe uplift, Mexico: a new piece of the Late Triassic–Jurassic Nazas Arc?

Villarreal-Fuentes

Levresse

Nieto-Samaniego

et al. 2014

International Geology Review

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Crustal stacking and expulsion tectonics during continental subduction: P-T deformation constraints from Oman

Cited by 84 publications

References 93 publications

A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

Linking the NE Anatolian and Lesser Caucasus ophiolites: evidence for large-scale obduction of oceanic crust and implications for the formation of the Lesser Caucasus-Pontides Arc

New geological and geochronological data of the Placer de Guadalupe uplift, Mexico: a new piece of the Late Triassic–Jurassic Nazas Arc?

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