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Formation of the Permian basalts and implications of geochemical tracing for paleo-tectonic setting and regional tectonic background in the Turpan-Hami and Santanghu basins, Xinjiang

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Abstract

The Turpan-Hami and Santanghu basins are the late Paleozoic-Mesozoic-Cenozoic reworked intracontinental basins that superposed on the folded basement of the Paleozoic orogenic belt. 40Ar/39Ar geochronological study of the basalts developed in the basins reveals that the formation period is Permain (293–266 Ma). From geochemical comparison of the basalts, the Santanghu basalts exhibit a strong depletion in Nb and Ta, and a selective enrichment in HFSE, reflecting that the source region is influenced by the subducted components related to subduction of the ancient oceanic crust and characterized with “lagged arc volcanic rocks”. In contrast, the Turpan-Hami basalts show a slight depletion in Nb and Ta, high Th/Ta ratio, similar to the basalts formed in an intracontinental extensional zone or in an initial rift. Combined with the formation period of the ophiolite and ophiolite mélange zones and regional magmatic activities occurring on the post-orogenic extensional background in northern Xinjiang, it can be inferred from these geochemical characteristics that the tectonic background for forming the Turpan-Hami and Santanghu basins is closely related to the regional extension after the continent-continent collisional orogeny. The basalts of the two basins came from different sources on the post-orogenic extensional background of the similar basin-forming dynamics. Although the settings are all intracontinental rift, the source for the Santanghu basalts is obviously subjected to the metasomatism of the subducted components, implying the existence of the previous subduction.

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Authors and Affiliations

  1. Key Laboratory of Continental Dynamics, Ministry of Education, Northwest University, Xi’an, 710069, China

    Zhou Dingwu, Liu Yiqun, Xing Xiujuan, Hao Jianrong, Dong Yunpeng & Ouyang Zhengjian

  2. Department of Geology, Northwest University, Xi’an, 710069, China

    Zhou Dingwu, Liu Yiqun, Xing Xiujuan, Hao Jianrong, Dong Yunpeng & Ouyang Zhengjian

  3. Geoinformation Science & Engineering College, SDUST, Qingdao, 266510, China

    Zhou Dingwu & Liu Yiqun

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  1. Zhou Dingwu
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  2. Liu Yiqun
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Correspondence to Zhou Dingwu.

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Zhou, D., Liu, Y., Xing, X. et al. Formation of the Permian basalts and implications of geochemical tracing for paleo-tectonic setting and regional tectonic background in the Turpan-Hami and Santanghu basins, Xinjiang. SCI CHINA SER D 49, 584–596 (2006). https://doi.org/10.1007/s11430-006-0584-1

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  • DOI: https://doi.org/10.1007/s11430-006-0584-1

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