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Age and duration of intra-oceanic arc volcanism built on a suprasubduction zone type oceanic crust in southern Neotethys, SE Anatolia 预览

Age and duration of intra-oceanic arc volcanism built on a suprasubduction zone type oceanic crust in southern Neotethys, SE Anatolia
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摘要 东南的古称包括象变形山岳, ophiolites,暴烈的弧单位和 granitoid 岩石那样的 tectono-magmatic/stratigraphic 单位的数字。所有为南部的 Neotethys 的迟了的白垩纪进化他们起重要作用。这些单位的空间、时间的关系建议同时代的 magmatism 的进步发展并且向北方在迟了的白垩纪期间推进 subduction/accretion。我们从普遍的暴烈的弧单位表演的 rhyolitic 岩石的新 U-Pb 锆石数据变老(83.1 ? The southeastern Anatolia comprises numbers of tectono-magmatic]stratJgraphic units such as the metamorphic massifs, the ophiolites, the volcanic arc units and the granitoid rocks. All of them play important role for the late Cretaceous evolution of the southern Neotethys. The spatial and temporal relations of these units suggest the progressive development of coeval magmatism and thrusting during the late Cretaceous northward subduction/accretion. Our new U-Pb zircon data from the rhyolitic rocks of the wide-spread volcanic arc unit show ages of (83.1 ± 2.2)-(74.6 ± 4.4) Ma. Comparison of the ophiolites, the volcanic arc units and the granitoids suggest following late Cretaceous geological evolution. The ophiolites formed in a suprasubduction zone (SSZ) setting as a result of northward intra-oceanic subduction. A wide-spread island-arc tholeiitic volcanic unit developed on the top of the SSZ-type crust during 83 75 Ma. Related to regional plate convergence, northward under-thrusting of SSZ-type ophiolites and volcanic arc units was initiated beneath the Tauride platform (Malatya-Keban) and followed by the intrusion of I-type calc-alkaline volcanic arc granitoids during 84 82 Ma. New U-Pb ages from the arc-related volcanic-sedimentary unit and granitoids indicate that under-thrusting of ophiolites together with the arc-related units beneath the Malatya-Keban platform took place soon after the initiation of the volcanic arc on the top of the SSZ- type crust. Then the arc-related volcanic-sedimentary unit continued its development and lasted at - 75 Ma until the deposition of the late Campanian-Maastrichtian shallow marine limestone. The subduction trench eventually collided with the Bitlis-Pfitfirge massif giving rise to HP-LT meta- morphism of the Bitlis massif. Although the development of the volcanic arc units and the granitoids were coeval at the initial stage of the subduction/accretion both tectono-magmatic units were genetically different from each other.
作者 Fatih Karaoglan Osman Parlak Urs Klotzli Friedrich Koller Tamer Rizaoglu Fatih Karao?lana; Osman Parlaka; parlak@cukurova.edu.tr; Urs Kl?tzlib; Friedrich Kollerb; Tamer R?zao?luc
出处 《地学前缘:英文版》 CAS CSCD 2013年第4期399-408,共10页 Geoscience Frontiers
基金 a part of Ph.D study of Fatih Karaoglan Financial support from the TBITAK(Project No.106Y231) Cukurova University Research Foundation(Project No.MMF2009D11) International Research Fellowship Programme supported by TUBITAK-BIDEB
关键词 新特提斯洋 大洋地壳 火山弧 年龄数据 SSZ型蛇绿岩 变质地块 花岗岩类 沉积单元 Island-arcOphioliteGranitoidU-Pb geochronologySSZ settingSE Anatolia
作者简介 Corresponding author. Cukurova Universitesi, Miihendislik-Mimarhk Fak(iltesi, Jeoloji Mtih. Boeluemti, 01330 Balcah, Adana, Turkey. Tel.: 490 322 338 70 81; fax: Fgo 322 338 67 15. E-mail address: parlak@cukurova.edu.tr (O. Parlak).
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