Characteristics of Ordovician Volcaniclastic Materials in Yanxia Area of Northern Tarim Basin and Their Geological Significance

被引：2
|
作者：
Hou M. [1 ,2 ]
Jiang W. [3 ]
Deng M. [4 ]
Cai P. [2 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu
[2] Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu
[3] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang
[4] Chengdu Center of China Geological Survey, Chengdu
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 03期
关键词：
Geochemistry; Ordovician; Tarim Basin; Volcaniclastic material; Yanxia area;
D O I：
10.3799/dqkx.2019.001
中图分类号：
学科分类号：
摘要：
The petrologic and geochemical signatures of volcaniclastic material preserved within carbonate platform deposits from boreholes in the Yanxia area of northern Tarim Basin indicate the presence of an active continental margin volcanic arc during the Middle and Late Ordovician. The volcaniclastics within the Middle Ordovician Yingshan Formation occur as thin layers of basic tuffites in which the vitric grains have undergone partial replacement by carbonate and clay. The volcaniclastics within the Upper Ordovician Lianglitage Formation are primarily basic volcanic clasts within oolitic and grainstone shoal deposits. Geochemical ratios,especially those of Th/Yb-Ta/Yb, U/Th-Th and Ba/Th-(La/Sm), fall within the fields for typical volcanic arcs on continental margins and with a variable admixture of fluids that had interacted with pre-volcanic terrestrial sediments. The degree of admixture is greatest in the volcaniclastics within the Lianglitage Formation, which suggests that the inferred subduction of the South Tianshan Ocean crust below the present northern margin of the Tarim plate had begun by Middle Ordovician and had intensified during the Late Ordovician. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：822 / 832
页数：10
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