内蒙古阿拉善北部杭乌拉地区早古生代硅质岩地球化学特征及其构造意义

doi:10.7605/gdlxb.2017.03.038

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Abstract Hangwula area of the northern Alxa in Inner Mongolia,located on the southern margin of the middle Central Asian Orogenic Belt(CAOB)and dominated by the Siberian Plate in its north,the Tarim Plate in its west and the North China Plate in its south,is one of the most typical areas for researching tectonic evolution of the CAOB and the Paleo-Asian Ocean. In this article,geochemical characteristics of the Early Paleozoic siliceous rocks were mainly studied to re-establish the tectonic evolution of the northern Alxa in Early Paleozoic combining with the previous results. The Early Paleozoic siliceous rocks of the Xishuangyingshan Formation and the Bandingtaolegai Formation in the Hangwula area were identified to contain clay,terrigenous silt and radiolarians under the microscopic analysis,which reveals that these siliceous rocks were of the distinct sedimentary origin. However,these Early Paleozoic siliceous rocks showed poor uniformity on their geochemical characteristics: The discrimination diagrams of major elements like Fe,Mn,Al and the ratio analyses of rare earth elements(REEs)like Sc/Th,(La/Ce)_n,and δCe indicate that the siliceous rocks belong to the stable continental margin deposits;but(La/Yb)_n value reflects a pelagic sedimentary background. δEu value shows that the origin process of the siliceous rocks was without hydrothermal participation. The ratio analyses of trace elements like V/Y,Ti/V conform to the ocean ridge or the ocean basin setting,but the U/Th and Ba/Sr radios accord with the hydrothermal feature. REE distribution patterns of the Early Paleozoic siliceous rocks are relatively flat with positive europium anomaly but without steep right-dipping LREE-rich trend or left-dipping HREE-rich trend,suggesting that their generation cannot be linked to classic continental margin or ocean basin. Although the Lower Paleozoic sedimentary records of the Hangwula area were relatively scarce,in view of the complex tectonic evolution characteristics of the Upper Paleozoic and its palaeogeographical inheritance,and combined with the above geochemical characteristics of the siliceous rocks,it can be considered that the Hangwula area of northern Alxa was in an archipelagic ocean environment during the Early Paleozoic.

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	Articles by authors
	Zheng Xiaoming
	Yin Haiquan
	Gao Lei
	Wang Shengyu
	Wang Yankai
	Zhou Hongrui
	Zhang Weijie

Key words： northern Alxa Paleozoic siliceous rock geochemical characteristics tectonic significance

Received: 04 February 2017 Published: 01 June 2017

ZTFLH:

P581

Corresponding Authors: Yin Haiquan,born in 1990,doctor,is an assistant engineer in First Crust Monitoring and Application Center, CEA. He is mainly engaged in researches of seismic geology,sedimentology and tectonics. E-mail: 742946697@qq.com.

About author: Zheng Xiaoming,born in 1981,master,is an engineer in China Non-ferrous Metal Resources Geological Survey. He is mainly engaged in researches of sedimentology and tectonics. E-mail: 84378912@qq.com.About the corresponding author Yin Haiquan,born in 1990,doctor,is an assistant engineer in First Crust Monitoring and Application Center, CEA. He is mainly engaged in researches of seismic geology,sedimentology and tectonics. E-mail: 742946697@qq.com.

Cite this article:

Zheng Xiaoming,Yin Haiquan,Gao Lei et al. Geochemical characteristics and its tectonic significance of the Early Paleozoic siliceous rocks in Hangwula area of northern Alxa,Inner Mongolia[J]. JOPC, 2017, 19(3): 491-502.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2017.03.038 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2017/V19/I3/491

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