新疆若羌县红柳沟Ⅰ号剖面新元古界成冰系冰沟南组硅质岩特征与沉积环境<sup>*</sup>

doi:10.7605/gdlxb.2021.04.042

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Abstract

The fine-grained sediments and carbonate rocks with a thickness of 300 m are discovered at the Binggounan Formation of Neoproterozoic Cryogenian system in Hongliugou section Ⅰ of Altyn in Xinjiang,and the asphalt which is the indicator of oil and gas is also found. Based on the section measurement,petrology and geochemistry of the 160 m thickness of siliceous rocks,it shows that siliceous rocks in the profile are mainly composed of quartz,clay,and tiny amounts of iron,manganese and phosphorus-bearing independent minerals. It has three types of structures,including cryptocrystalline,microcrystalline quartz and coarse-megacrystalline quartz with a “mosaic structure”. The concents of SiO₂,Fe₂O₃,Ba and δEu_n in siliceous rocks are relatively high,while the contents of Al₂O₃,MnO,MnO/TiO₂,U/Th, Sr/Ba are much lower. The values of ∑REE,Sr/Ba,MnO₂/TiO₂ and δCe_n change regularly. The average δ³⁰Si is -0.43‰(-0.8‰~0.3‰),and the average $\delta^{18}O_{Snow}$ is 20.42‰(16.0‰~26.0‰),and the estimated average temperature is 90 ℃(52~127 ℃),which indicates that there are multiple sedimentary cycles for the siliceous rocks. They deposit in the continental margin basin that is characterized as the mixing of sea water and hydrothermal fluid. Afterwards,they underwent the early diagenesis,shallow burial period,the superimposition and reworking of thermal and fresh water related with the multiple strike slipping activities.

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	Articles by authors
	Qian Yi-Xiong
	Li Yue-Jun
	Chu Cheng-Lin
	Yang Xin
	Li Wang-Peng
	Chen Yue
	Ma Hong-Qiang

Key words： siliceous rocks petrology geochemistry Neoproterozoic Altyn Tagh fault Ruoqiang County

Received: 18 August 2020

ZTFLH:

P588.2

Fund:

Co-funded by the project “Sedimentary environment and reservoir formation of Mesoproterozoic and Neoproterozoic microbial carbonate rocks”National Key R & D Projects (No.2017YFC0603103)and the project of SINOPEC“Sedimentary characteristics and source & reservoir conditions of Neoproterozoic and Cambrian in Tarim Basin”(No.P17046-4)

About author: Qian Yi-Xiong,born in 1962,Ph.D.,is a researcher. He is mainly engaged in geochemistry. E-mail: qyx9167@vip.sina.com.

Cite this article:

Qian Yi-Xiong,Li Yue-Jun,Chu Cheng-Lin et al. Characteristics and sedimentary environment of siliceous rock in the Neoproterozoic Cryogenian Binggounan Formation at Hongliugou section Ⅰ in Ruoqiang County,Xinjiang[J]. JOPC, 2021, 23(4): 668-682.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2021.04.042 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2021/V23/I4/668

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