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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• 作者：Dingwu Zhou (1) (2) (3)
  Yiqun Liu (1) (2) (3)
  Xiujuan Xing (1) (3)
  Jianrong Hao (1) (3)
  Yunpeng Dong (1) (3)
  Zhengjian Ouyang (1) (3)
  
• 关键词：Xinjiang ; Tu ; Ha basin ; Santanghu basin ; basalt ; postorogeny ; tectonic setting ; extensional background
• 刊名：Science China Earth Sciences
• 出版年：2006
• 出版时间：June 2006
• 年：2006
• 卷：49
• 期：6
• 页码：584-596
• 全文大小：1332KB
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• 作者单位：Dingwu Zhou (1) (2) (3)
  Yiqun Liu (1) (2) (3)
  Xiujuan Xing (1) (3)
  Jianrong Hao (1) (3)
  Yunpeng Dong (1) (3)
  Zhengjian Ouyang (1) (3)
  
  1. Key Laboratory of Continental Dynamics, Ministry of Education, Northwest University, Xi’an, 710069, China
  2. Geoinformation Science & Engineering College, SDUST, Qingdao, 266510, China
  3. Department of Geology, Northwest University, Xi’an, 710069, China
  
• ISSN：1869-1897

文摘

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 (293-66 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.