ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
北羌塘托纳木地区上白垩统阿布山组沉积特征、物源分析及其构造意义
  
关键词:Late Cretaceous  Qiangtang Basin  sedimentary  provenance  tectonic significance
基金项目:科技部“第二次青藏高原综合科学考察研究”项目(编号: 2019QZKK0803);国家重点研发项目(编号: 2017YFC0601405; 2018YFE0204204)
作者单位E-mail
杜林涛 中国地质大学(北京)地球科学与资源院 lintaodu@cugb.edu.cn 
李亚林 中国地质大学(北京)地球科学与资源院  
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摘要:
Sedimentary Characteristics, Provenance Analysis and Tectonic Significance of the Late Cretaceous Abushan Formation in Tonamu Area, Northern Qiangtang
      The Qiangtang–Lhasa collisional orogeny is the most important Mesozoic tectonic event in the Tibetan Plateau. The Late Cretaceous Abushan Formation in the Qiangtang Basin serves as the sedimentary record of the Qiangtang–Lhasa collision orogeny. There is a rare Late Cretaceous Abushan Formation deposit in northern Qiangtang Depression in Tonamu area. However, the tectonic setting and dynamic mechanism of its formation remain unclear. In this paper, the sedimentary environment and provenance of Abushan Formation in Tonamu area are shown in detail. The comprehensive analysis of the provenance, including the composition of gravel, paleocurrences, sandstone petrology, heavy minerals of sandstone and U-Pb dating of detrital zircons, shows that the central uplift belt and the interior of the basin all provided the provenance of the Abushan Formation. Combined with the comparison of the Abushan Formation in the adjacent areas, it is considered that the provenance of the study area came from the underlying sediments in the southwest of the basin, the volcanic rocks of the Late Triassic Nadiganri Formation and the basement of the basin. Sediments of Abushan Formation are controlled by intra-basin structures. The provenance characteristics of the Abushan Formation in the Tonamu area reflect the thrust event in the Late Cretaceous terrane of the northern Qiangtang and were related to the collision of Qiangtang–Lhasa Terrane.
DU Lin-tao,LI Ya-lin.2022.Sedimentary Characteristics, Provenance Analysis and Tectonic Significance of the Late Cretaceous Abushan Formation in Tonamu Area, Northern Qiangtang[J].Acta Geoscientica Sinica,43(4):555-568.
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