准噶尔盆地吉木萨尔凹陷中二叠统芦草沟组云质岩沉积环境及白云石成因探讨<sup>*</sup>

doi:10.7605/gdlxb.2018.01.003

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Abstract

The Middle Permian Lucaogou Formation of Jimusar Depression,Junggar Basin is characterized by lacustrine fine-grained dolomitic sediments,which are composed of silt-sized to mud-sized terrigenous clasts,tuff clasts,carbonate and hydrothermal minerals. This paper is aimed to understand the sedimentary environment and formation mechanism of dolomitic rocks by studying their petrological,mineralogical and geochemical features. Petrological-mineralogical and major and trace element characteristics of the dolomitic rocks suggest the study area was a shallow salty lake formed under an arid climate during the Middle Permian,and was characterized by intense regional volcanism and active mantle-derived hydrothermal in the basin. The dolomites in the dolomitic rocks mainly present as euhedral-subhedral micritic crystals,forming fine lamination or mixing with other compositions,while fine-crystalline dolomites can only be found occasionally. The micritic dolomites,with low order degrees(0.46)and homogeneous compositions,are usually surrounded by laminations. The fine-crystalline dolomites are featured by well-developed metasomatic relict texture and thereby should be the product of diagenesis. Both two kinds of dolomites have high strontium and low magnesium contents,while fine-crystalline dolomites have higher contents of iron and manganese than that of micritic dolomites. The micritic dolomites have a low δ¹⁸O_PDB(av.-4.72‰). The forming temperature,54.61℃ to 186.46℃,is calculated from the δ¹³C_PDB(av. 8.79‰)of micritic dolomites might be resulted from the gigantic buried organic matter of Lucaogou Formation and metabolic activities of methanogens. In conclusion,the micritic dolomites are contemporaneous-penecontemporaneous protodolomite. Magnesium ion was supplied by the salty lake water,tuff materials as well as mantle-dervied hydrothermal fluid. The dynamic barrier of dolomite formation was broken by the high temperature brought from hydrothermal fluid and the metabolic activities of methanogens.

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	Zhang Shuai
	Liu Yi-Qun
	Jiao Xin
	Zhou Ding-Wu
	Zhang Xu
	Lu Shen-Tong
	Zhou Ning-Chao

Key words： dolomite origin mantle-derived hydrothermal fluid Lucaogou Formation Jimusar Depression Junggar Basin

Received: 16 October 2017

ZTFLH:	P512.2
	P571

Fund:

Financially supported by General Program of the National Natural Science Foundation of China(Nos. 41572086, 41272116)

Corresponding Authors: Liu Yi-Qun,born in 1951,is a professor and supervisor of Ph.D. candidate. Now She is mainly engaged in researches of sedimentology,petroliferous basin geology and exhalative rock sediments. E-mail: liu-yiqun@263.com.

About author: Zhang Shuai,born in 1993,master degree candidate. He is engaged in sedimentology. E-mail: geologyzs0409@gmail.com.

Cite this article:

Zhang Shuai,Liu Yi-Qun,Jiao Xin et al. Sedimentary environment and formation mechanisim of dolomitic rocks in the Middle Permian Lucaogou Formation,Jimusar Depression, Junggar Basin[J]. JOPC, 2018, 20(1): 33-48.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.01.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I1/33

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