宗务隆构造带西段三叠系隆务河组碎屑锆石特征及其构造意义
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P578.94+1;P597;P595

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2019年度青海大学两级财政建设专项(41250103);青海省自然科学基金项目(2019-ZJ-964);青海省地质调查局项目(2018-SF-109)


Detrital zircon characteristics of the Triassic Longwuhe Formation in the western segment of the Zongwulong tectonic belt and its tectonic significance
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    摘要:

    宗务隆构造带位于柴北缘构造带与南祁连构造带之间,总体呈北西西向展布。构造带东段丰富的岩浆活动记录了该构造带晚古生代—中生代期间的裂解和闭合过程,而西段岩浆活动的记录较为稀少,对于其东、西段是否具有相同的构造演化尚不清晰。通过分析构造带西段三叠系隆务河组碎屑岩的地球化学特征、碎屑锆石U-Pb年龄及Hf同位素组成,认为隆务河组的碎屑沉积物的源区古风化程度轻微,不具备沉积再循环的特征,原岩主要为长英质岩石,南祁连新元古代花岗质片麻岩和早古生代大陆弧型花岗岩为隆务河组碎屑岩的主要物源;碎屑岩可能沉积于早中三叠世挠曲型盆地中;锆石U-Pb年龄分析表明宗务隆构造带东西段构造演化具有不同的历程,东段发育有限洋盆,而西段并未出现,转换地带可能位于生格至罗根郭勒之间。

    Abstract:

    The Zongwulong tectonic belt is located between the northern Qaidam tectonic belt and the South Qilian tectonic belt, which is generally distributed in a NWW direction. The voluminous magmatic activity in the eastern part of the tectonic belt records the process of breakup and closure of the tectonic belt during the late Paleozoic Mesozoic, while the magmatic activity in the western part is relatively rare, so it is unclear whether the eastern and western parts of the belt have the same tectonic evolution. Based on the analysis of geochemical characteristics, detrital zircon U-Pb ages and Hf isotopic compositions of the clastic rocks of the Triassic Longwuhe Formation in the western part of the tectonic belt, it is considered that the provenance of the detrital sediments in the Longwuhe Formation was slightly weathered without sedimentary recycling characteristics, and their original rocks are mainly felsic rocks. The main provenance of clastic rocks in the Longwuhe Formation is the southern Qilian Neoproterozoic granitic gneiss and early Paleozoic continental arc granite rocks, and the clastic rocks may have been deposited in Early-Middle Triassic flexural basins. Zircon U-Pb age analysis shows that the tectonic evolution of the eastern and western segments of Zongwulong tectonic belt has different processes. Limited ocean basins developed in the eastern segment but not in the western segment, the transition zone may be located between Shengge and Luogenguole area.

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赵文涛,刘少峰,陈敏,薛春纪,2022,宗务隆构造带西段三叠系隆务河组碎屑锆石特征及其构造意义[J].岩石矿物学杂志,41(3):569~591. ZHAO Wen-tao, LIU Shao-feng, CHEN Min, XUE Chun-ji,2022,Detrital zircon characteristics of the Triassic Longwuhe Formation in the western segment of the Zongwulong tectonic belt and its tectonic significance[J]. Acta Petrologica et Mineralogica,41(3):569~591.

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  • 收稿日期:2021-04-25
  • 最后修改日期:2022-03-14
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  • 在线发布日期: 2022-05-17
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