Depositional Age and Tectonic Settings of Neoproterozoic Qianzimen Formation in Southeast Chongqing:U-Pb Dating and Geochemistry Constraint

WANG Dan; LING Yun; LIU Wei; MA Zhixin; SUN Zhiming; LIN Fangcheng

Northwestern Geology > 2015 > 48(2): 95-103.

WANG Dan, LING Yun, LIU Wei, et al. Depositional Age and Tectonic Settings of Neoproterozoic Qianzimen Formation in Southeast Chongqing:U-Pb Dating and Geochemistry Constraint[J]. Northwestern Geology, 2015, 48(2): 95-103.

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Depositional Age and Tectonic Settings of Neoproterozoic Qianzimen Formation in Southeast Chongqing:U-Pb Dating and Geochemistry Constraint

1.
Chengdu University of Technology, Chengdu 610059, Sichuan, China
2.
607 Geological Team Chongqing Geological and Mineral Resource Exploration and Development Bureau, Chongqing 400056, China
3.
Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China

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Received Date: March 18, 2015
Revised Date: April 01, 2015
Published Date: June 04, 2015

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Abstract

There are two major glacial events in Neoproterozoic globally, respectively the Sturtian glacial stage and Marinoan glacial stage.Corresponding glacialde posits develop in Xiushan area of Southeast Chongqing, respectively Nantuo formation and Qianzimen formation. ZirconLA-ICP-MS dating of Qianzimen sandstone obtains ²⁰⁶Pb/²³⁸U age of 736—2 726 Ma, in which the data of 28 measuring points concentrate between 736 and 890 Ma, with anaver age of 834 Ma. Minimum value of 736 Ma defines the sedimentary starting time of Qianzimen formation, which can be compared with Jiangkou glacial stage of southeastern Hunan started in 734±4 Ma, almost unanimously in the same error range.The age of 834 Ma records magmatism related to Sipu-Jinning orogeny movement in provenance.ICV numerical values of all samples being 0.85—1.74(1.23 on average) show that clay minerals are less and Qianzimen formation is less affected by the redeposition. Meanwhile, CIA numerical values of the samples being 43—69(57 on average)indicatethe sedimentation environment of Qianzimen formation is cold, dry and low degree of chemical weathering.SiO₂-K₂O/Na₂O and K₂O/Na₂O-SiO₂/Al₂O₃ discrimination diagrams and REE patternscurve indicate that Qianzimen formation is created in the active continental margin environment.
- Neoproterozoic,
- Qianzimenformation,
- U-Pbages,
- sandstones,
- snowballearth,
- southeast Chongqing

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Depositional Age and Tectonic Settings of Neoproterozoic Qianzimen Formation in Southeast Chongqing:U-Pb Dating and Geochemistry Constraint

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