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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry and U-Pb zircon geochronology of the Alvand plutonic complex in Sanandaj-Sirjan Zone (Iran): New evidence for Jurassic magmatism
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Geochemistry and U-Pb zircon geochronology of the Alvand plutonic complex in Sanandaj-Sirjan Zone (Iran): New evidence for Jurassic magmatism

机译：Sanandaj-Sirjan地带（伊朗）Alvand岩体复杂的地球化学和U-Pb锆石年代学：侏罗纪岩浆作用的新证据

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摘要

This paper presents geochemical, Sr-Nd isotopic, and U-Pb zircon geochronological data on the Alvand plutonic complex in Sanandaj-Sirjan zone (SSZ), Western Iran. The gabbroic rocks show a trend of a calc-alkaline magma suite and are characterized by low initial ~(87)Sr/~(86S)r ratios (0.7023-0.7037) and positive ε:Nd(t) values (2.9-3.3), which suggest derivation from a moderately depleted mantle source. Geochemical features of the granites illustrate a high-K calc-alkaline magma series, whereas the leucocratic granitoids form part of a low-K series. Granites have intermediate ~(87)Sr/~(86)Sr ratios (0.707-0.719) and negative εNd_(t) values (-1.0 to -3.4), while leucocratic granitoids have higher initial ~(87)Sr/~(86)Sr ratio (0.713-0.714) and more negative ε(Nd_(t) values (-3.5 to -4.5). Potential basement source lithologies for the granites are Proterozoic granites and orthogneisses, and those for the leucocratic granites are pla-gioclase-rich sources such as meta-arkoses or tonalites. The U-Pb dating results demonstrate that all granitoids were exclusively emplaced during the Jurassic instead of being Cretaceous or younger in age as suggested previously. The pluton was assembled incrementally over c. 10 Ma. Gabbros formed at 166.5 ±1.8 Ma, granites between 163.9 ±0.9 Ma and 161.7 ±0.6 Ma, and leucocratic granitoids between 154.4+1.3 and 153.3 ± 2.7 Ma. Granites and leucocratic granitoids show some A-type affinity. It is concluded that the Alvand plutonic complex was generated in a continental-arc-related extensional regime during subduction of Neo-Tethyan oceanic crust beneath the SSZ. The U/Pb zircon age data, recently corroborated by similar results in the central and southern SSZ, indicate that Jurassic granitoids are more areally extensive in this belt than previously thought.
机译：本文介绍了伊朗西部Sanandaj-Sirjan地带（SSZ）Alvand岩屑复合体的地球化学，Sr-Nd同位素和U-Pb锆石年代学数据。辉长岩显示出钙碱性岩浆组的趋势，其特征是初始〜（87）Sr /〜（86S）r比率低（0.7023-0.7037），并且正ε：Nd（t）值正（2.9-3.3） ，这表明它来自中度耗尽的地幔源。花岗岩的地球化学特征说明了高K钙碱性岩浆系列，而白垩纪花岗岩类是低K系列的一部分。花岗岩具有中等的〜（87）Sr /〜（86）Sr比（0.707-0.719）和εNd_（t）负值（-1.0至-3.4），而白垩质花岗岩具有较高的初始〜（87）Sr /〜（86）比率（0.713-0.714）和更大的ε（Nd_（t）负值（-3.5至-4.5）。花岗岩的潜在基底源岩性为元古生代花岗岩和原片麻岩，白垩纪花岗岩的潜在基底岩性为斜长石- U-Pb测年结果​​表明，所有的类花岗岩都是侏罗纪时期的唯一沉积岩体，而不是像以前建议的那样是白垩纪或更年轻的岩体，在约10 Ma。Gabbros上逐渐聚集了这些岩体。形成于166.5±1.8 Ma，花岗岩在163.9±0.9 Ma和161.7±0.6 Ma之间，白垩纪花岗岩类在154.4 + 1.3和153.3±2.7 Ma之间；花岗岩和白垩纪花岗岩类具有一定的A型亲和力。复合物是在与大陆弧有关的延伸体制中产生的g SSZ下新特提斯洋壳的俯冲。 U / Pb锆石年龄数据最近得到了SSZ中部和南部地区类似结果的证实，表明侏罗纪花岗岩在该带的面积比以前认为的要广泛。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第6期|p.668-683|共16页
  • 作者

    H. Shahbazi; rnW. Siebel; rnM. Pourmoafee; rnM. Ghorbani; rnA.A. Sepahi; rnC.K. Shang; rnM. Vousoughi Abedini;

  • 作者单位

    Shahid Beheshti University, Earth Science Faculty, Evin Street, Tehran, Iran;

    rnInstitute of Geosciences, Universitaet Tubingen, Wilhelmstr, 56, D-72074 Tuebingen, Germany;

    rnShahid Beheshti University, Earth Science Faculty, Evin Street, Tehran, Iran;

    rnShahid Beheshti University, Earth Science Faculty, Evin Street, Tehran, Iran;

    rnDepartment of Geology, Bu Ali Sina University, Shariati Street, Hamedan, Iran;

    rnInstitute of Geosciences, Universitaet Tubingen, Wilhelmstr, 56, D-72074 Tuebingen, Germany;

    rnShahid Beheshti University, Earth Science Faculty, Evin Street, Tehran, Iran;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    alvand pluton; sanandaj-sirjan zone; Sr-Nd isotopes; U-Pb zircon;

    机译：阿尔文·普拉顿Sanandaj-Sirjan区;Sr-Nd同位素;铅锆石;

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