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首页> 外文期刊>International Journal of Earth Sciences >Detrital zircon provenance analysis in the Zagros Orogen, SW Iran: implications for the amalgamation history of the Neo-Tethys
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Detrital zircon provenance analysis in the Zagros Orogen, SW Iran: implications for the amalgamation history of the Neo-Tethys

机译：伊朗西南部扎格罗斯造山带的碎屑锆石物源分析：对新特提斯人合并历史的影响

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摘要

The Zagros Orogen developed as a result of Arabia-Eurasia collision. New in situ detrital zircon U-Pb and Hf isotopic analyses from a Cenozoic sedimentary sequence in SW Iran are used to unravel the amalgamation history of Neo-Tethys. Data indicate that: (1) Paleocene and Eocene strata (58 and 45 Ma, respectively) were sourced from obducted ophiolite and Triassic volcanics, (2) Lower Miocene (similar to 18 Ma) strata indicate mixed provenance from obducted ophiolite and Iranian magmatic rocks, (3) Mid to Upper Miocene sediments (similar to 14 to 11.2 Ma) were mainly sourced from Sanandaj-Sirjan zone granitoids to the north, and (4) Lower Pliocene (similar to 5 Ma) sediments mainly show Arabian age characteristics, with a minor Eurasian affinity component. Two hypotheses are outlined to highlight the key events: Hypothesis A, previously published by several workers, suggests that the sequence studied lay on the Arabia passive margin and that initial collision occurred prior to 18 Ma; Hypothesis B, modified from the Makran model, which is here preferred, suggests that Paleogene to Upper Miocene sediments were sourced from the northern Neo-Tethyan accretionary complex or Eurasia, and carry no input from Arabia, whereas the Lower Pliocene sample shows a mixed provenance from both Arabia and Eurasia, suggesting that collision occurred between similar to 11.2 and 5 Ma.
机译：Zagros造山带是阿拉伯-欧亚大陆碰撞的结果。来自伊朗西南部新生代沉积序列的新的原位碎屑锆石U-Pb和Hf同位素分析用于揭示新特提斯的合并历史。数据表明：（1）古新世和始新世地层（分别为58 Ma和45 Ma）来自俯冲的蛇绿岩和三叠纪火山岩；（2）下中新世（类似于18 Ma）地层表明，俯冲的蛇绿岩和伊朗岩浆岩混合物源，（3）中新世至上中新世沉积（约14至11.2 Ma）主要来自北部的Sanandaj-Sirjan带花岗岩，（4）下新世（约5 Ma）沉积主要表现出阿拉伯时代特征，次要的欧亚亲和力成分。概述了两个假设以突出关键事件：先前由几位工人发表的假设A表明，所研究的序列位于阿拉伯被动边界上，初始碰撞发生在18 Ma之前；从Makran模型修改而来的假设B（这里是首选）表明，古近纪至上中新世的沉积物来自北部新特提斯增生复合体或欧亚大陆，没有来自阿拉伯的输入，而下新世的样本显示出混合的来源来自阿拉伯和欧亚大陆的研究表明碰撞发生在类似于11.2和5 Ma之间。

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  • 来源
    《International Journal of Earth Sciences》 |2017年第4期|1223-1238|共16页
  • 作者

    Zhang Zhiyong; Xiao Wenjiao; Majidifard Mahmoud Reza; Zhu Rixiang; Wan Bo; Ao Songjian; Chen Ling; Rezaeian Mahnaz; Esmaeili Rasoul;

  • 作者单位

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China|Univ Melbourne, Sch Earth Sci, Parkville, Vic 3010, Australia;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China|CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;

    Geol Survey Iran, Res Inst Earth Sci, Tehran, Iran;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China|CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China|CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;

    Inst Adv Studies Basic Sci, Zanjan, Iran;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Neo-Tethys; Zagros Orogen; Arabia-Eurasia collision; Detrital zircon U-Pb geochronology; Hf isotopes;

    机译：新特提斯;扎格罗斯造山带;阿拉伯-欧亚大陆碰撞;碎屑锆石U-Pb年代学;H同位素;

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