塔里木盆地东北部中上奥陶统却尔却克群深水碳酸盐岩及白云岩化<sup>*</sup>

doi:10.7605/gdlxb.2016.01.002

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Abstract

Deep-water carbonate rocks and its dolomitization of the Middle and Upper Ordovician Queerquek Formation in Kuluketage Mountain,northeastern Tarim Basin,is one of special types of deposition and diagenesis. By detailed observation and sampling of the Nanyaerdangshan section,we studied the sedimentary,petrological and geochemical features of the dolomitic beds. The deep-water carbonate rocks,which occurred in thrust-nappe or gravity-related sliding shapes in the stratigraphic column of the outcrop, is of yellow and dark grey,thin to medium bedding dolostone interbedded with mudstone,marl and shale,usually irregular and lenticle “knotty nodule”accompanied with turbidite of fine rocks debris either at the bottom or at the top. It is characterized by the planktonic faunas such as trilobite,siliceous sponge spicules and echinoderm fragments,and richness in poorly sorted terrigenous sediment attributed to grantite,volcanic and siliceous rocks. The carbonate rocks exhibited a certain rhythm structures such as dissolved-bedding,thin-horizontal bedding and few of algae laminae in primitive sediment. The main mineralogical peculiarities of dolostone composed of nine various types i.e.,near-micritic,giant ooids,fine-crystalline dolostone,bitumen-bearing algae poloid dolostone with residual bioclastics and silicification,and so on. The low and middle degree of order varies between 0.47-0.56 and 0.70-0.76, with a medium and extensive cathodluminescence(CL),indicating two-episodes strong dolomitization. The carbonate rocks have the abundance of SiO₂ and Al₂O₃, and richness of Mg、Mn、Fe、MnO and TiO₂. The value of δ³⁴S_V-CDT(-0.2-6.6) and REE(46.7×10^-6-67.4×10^-6) are similar to the shale on the “cap-form”distribution pattern of rare earth elements with positive europium(δEu)and negative cerium(δCe), indicating a relative reduction deep-water environment. The salinity index such as Na₂O+K₂O,Sr and Sr/Ba, are rather low,compared with those of typical terrace carbonate rocks. Since the higher ⁸⁷Sr/⁸⁶Sr ratio of the dolostone with rather low values ofδ¹⁸O_PDB δ¹³ C_PDB,it can’t be interpreted as a typical of isotopic feature of coeval seawater. Therefore,the deep-water carbonate rocks were developed in a shallowing-up parts of gentle-slope, then suffered two-episodes dolomitization at shallow buried or middle and deep buried respectively,and finally were thrusted or gravities-slided into outer continental shelf or lower parts of slope,with dolomite and calcite, hydrocarbon fillings in dissolved-vugs-fractures.

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	Qian Yixiong
	Zhang Keyin
	Chen Yue
	Chen Qianglu
	Tian Mi
	You Donghua
	Luo Yu

Key words： deep-water carbonate rocks dolomitization geochemistry Ordovician Tarim Basin

Received: 07 April 2015 Published: 01 February 2016

ZTFLH:

P588.2

Cite this article:

Qian Yixiong,Zhang Keyin,Chen Yue et al. Deep-water carbonate rocks and their dolomitization of the Middle and Upper Ordovician Queerquek Formation in northeastern Tarim Basin[J]. JOPC, 2016, 18(1): 21-38.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.01.002 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I1/21

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