Geochronology and tectonic significance of the Mesoproterozoic Dengxiangying Group in the western Yangtze Block

被引：0
|
作者：
Liu Y. [1 ]
Hu H. [2 ]
Yi K. [3 ]
Zhi C. [4 ]
Zhang J. [5 ]
机构：
[1] Lanzhou City University, Gansu, Lanzhou
[2] Changjiang Geophysical Exploration and Testing Company Limited, Hubei, Wuhan
[3] Fifth Geology Company of Hebei Geology and Minerals Bureau, Hebei, Tangshan
[4] Zhangye Geo-mine Survey Institute of Nonferrous Metal Geological Exploration, Gansu, Zhangye
[5] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 08期
关键词：
Dengxiangying Group; geochemistry; tectonic setting; western Yangtze Block; zircon U-Pb dating;
D O I：
10.19762/j.cnki.dizhixuebao.2023311
中图分类号：
学科分类号：
摘要：
Thelate Mesoproterozoic Dengxiangying Group in the -western Yangtze Block is a rift-related sedimentary-volcanic sequence that is particularly important for the Precambrian tectonic evolution of the Yangtze Block. LA-ICP-MS zircon U-Pb dating of the Songlinping, the Zegu and the Chaowangping yielded zircon U-Pb ages of 1166 + 6 Ma, 1040 + 4 Ma and 1020 + 4 Ma, respectively. The geochemical features of Songlinping sandstone samples indicate a predominantly felsic (granitic) source for the detritus. The Zegu dacites have high Zr, Hf, Ga, and HREE contents and Ga/Al ratios, and high calculated zircon saturation temperatures, thus resembling A-type granitoids. In addition, these rocks have negative eHf(z) values (- 15. 1-9. 1) , indicative of their derivation from partial melting of felsic continental crust. The geochemical discrimination diagrams suggest a continental rift setting for the Dengxiangying Group. Combined with previous studies, we concluded that the western Yangtze Block was located in an intra-continental rifting basin in a passive continental margin during the late Mesoproterozoic. An early-Neoproterozoic tectonic transformation from a continental-rifting basin to a compressional setting is suggested, and the Yangtze Block was in the peripheral rather in the center in the configuration of Rodinia. © 2023 Geological Society of China. All rights reserved.
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页码：2476 / 2494
页数：18
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