Late Paleozoic back-arc basin in the Indochina block: Constraints from the mafic rocks in the Nan and Luang Prabang tectonic zones, Southeast Asia

Wang Yuejun; Yang Tuoxin; Zhang Yuzhi; Qian Xin; Gan Chengshi; Wang Yukun; Wang Yang; Senebouttalath Vongpaseuth

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Late Paleozoic back-arc basin in the Indochina block: Constraints from the mafic rocks in the Nan and Luang Prabang tectonic zones, Southeast Asia

机译：Indochina阻滞的晚古生代背弧盆地：南和琅勃拉邦构造区，东南亚的迈克斯岩石的限制

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Southeast Asia was mainly created by the late Paleozoic assemblage of the Eastern Cimmeria with other continental fragments. However, the tectonic nature and geodynamic setting of the key tectonic zones in the Indochina block are still in dispute, hindering the understanding of the Eastern Paleotethyan evolution of Southeast Asia. This study presents a set of new geochronological, elemental and Sr-Nd isotopic data for the late Paleozoic mafic rocks in the Nan and Luang Prabang tectonic zones. The mafic rocks from the Nan and Luang Prabang zones give zircon U-Pb ages of 279-294 Ma and 265-294 Ma, respectively, with xenocryst ages of 302-2524 Ma. They have SiO2 = 45.99-57.47 wt%, Al2O3 = 12.74-21.06 wt%, FeOt = 8.34-15.03 wt% and MgO = 2.79-14.74 wt% with mg-number of 34-74, and fall into the fields of basalt/basaltic andesite and its equivalents. These rocks are characterized by enrichment in LILEs and LREEs, depletion in HFSEs, low initial Sr-87/Sr-86 ratios (0.7032-0.7057) and high epsilon(Nd)(t) values (+ 4.8 to + 7.4). They might be derived from a mantle wedge source modified by slab-derived components, and formed in a continental back-arc basin setting. Our analysis indicates the development of the Carboniferous-Permian mafic igneous event in the Nan and Luang Prabang tectonic zones, and that the Nan tectonic zone linked northerly with the Luang Prabang zone during the late Paleozoic, tectonically comparable to the Banpo-Nanlinshan back-arc basin in SW Yunnan, SW China. The back-arc basin finally closed in the early-middle Triassic and the subsequent assemblage continued fill the latest Triassic in response to the eastward subduction of the Paleotethyan slab.

机译：东南亚主要是由东联米氏古生代大古生代大碎片与其他大陆碎片创造的。然而，印度支那块中关键构造区的构造性质和地球动力学设置仍处于争议，妨碍了对东南亚东部的古代石古山脉演变的理解。本研究介绍了一套新的地质古代，元素和SR-ND同位素，用于南和琅勃拉邦构造区的晚古生代麦克风岩石。来自南和琅勃勃地区的MAFIC岩石，分别给予锆石U-PB衰退，分别为279-294 mA，265-294 mA，XenoCryst ages 302-2524 mA。它们具有SiO2 = 45.99-57.47wt％，Al2O3 = 12.74-21.06wt％，Feot = 8.34-15.03wt％和MgO = 2.79-14.74wt％，Mg数量为34-74，并落入玄武岩领域/玄武岩和等同物。这些岩石的特征在于植物和猪肉中富集，HFSES中的耗尽，初始SR-87 / SR-86比率（0.7032-0.7057）和高ε（Nd）（T）值（+ 4.8至+ 7.4）。它们可能来自由平板衍生的组件修改的地幔楔形源，并形成在大陆后弧盆地设置中。我们的分析表明，在南和琅勃拉邦构造区中的石炭纪 - 二叠纪·迈克斯·梅西克·成绩的发展，以及南部构造与琅勃拉邦区连接的晚期古生代，与班诺南林背弧相当。盆地在SW云南，SW中国。后弧盆地最终在早期的三叠系中关闭，随后的组合持续填补了最新的三叠系，以响应古石山的东部俯冲。

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来源
《Journal of Asian earth sciences》 |2020年第15期|104333.1-104333.20|共20页
作者
Wang Yuejun; Yang Tuoxin; Zhang Yuzhi; Qian Xin; Gan Chengshi; Wang Yukun; Wang Yang; Senebouttalath Vongpaseuth;
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Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai 519082 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai 519082 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai 519082 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Key Lab Geodynam & Geohazards Guangzhou 510275 Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Wuhan 430074 Peoples R China;

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正文语种 eng
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Late Paleozoic mafic rocks; Nan and Luang Prabang tectonic zones; Back-arc basin; Paleotethyan slab subduction; Southeast Asia;

机译：晚古生代乳头岩石;南和琅勃拉邦构造区;后弧盆地;古石山层俯冲;东南亚;

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Late Paleozoic back-arc basin in the Indochina block: Constraints from the mafic rocks in the Nan and Luang Prabang tectonic zones, Southeast Asia

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