新疆三塘湖盆地中二叠统芦草沟组湖相白云岩成因<sup>*</sup>

doi:10.7605/gdlxb.2012.01.005

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Abstract The Santanghu Basin is a small intermountain basin located in northeastern Xinjiang，NW China.The Middle Permian comprises the Wulapo，Jingjingzigou，Lucaogou and Hongyanchi Formations from bottom to top.The Lucaogou Formation was formed of interbeded sedimentary rocks such as dolostone，limestone，black mudstone，shale and detrital rock in lacustrine environment.Two kinds of dolostones were found in this basin.One was named silt-micrite dolostone which contains 70 percent of clay-sized dolomite，30 percent of silt-sized dolomite.The dolomite exhibit weak ordering with degree of 0.48.Morphologically，the dolomite was divided into micro-rhombohedra，xenomorphic crystal，microsphere，and microtubule types under the SEM.Part of the micro-rhombohedra dolomite was ferric dolomite.The other kind of dolostone was named analcime-sanidine dolostone which was composed of fine grained analcime with the granularity of 0.08～0.35mm，micrite potash feldspar(almost sanidine)，micrite dolomite，ankerite，and few coarse crystalline dolomite.This kind of dolomite also showed weak ordering with degree of 0.58.Compared with the dolomites in silt-micrite dolostone，the dolomites in analcime-sanidine dolostone which were almost subhedral rhombohedras under the SEM were characterized as high iron and manganese.The similarities between these two dolostones were that they were poor ordering dolomites，abundant in strontium，and lacking of the evidence in replacement during the buried period.Although these two dolostones were deposited in the similar shallow and semi-deep lake anoxic reduction environment，their differences in composition，trace elements and stable isotopes indicated that they had great diversity in their genesis.The silt-micrite dolostone revealed the features of primary precipitation.The microbe was likely to play a formative role in the precipitation of the microspheroidal and microtubular dolomites.Moreover，the micro-rhombohedrala and xenomorphic dolomites were directly precipitated from lake water.Contrastly，the dolomites in analcime-sanidine dolostone were precipitated by the hydrothermal exhalative processes of the sublacustrine hotsprings.

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	Li Hong
	Liu Yiqun
	Liang Hao
	Zhou Xiaohu
	Jiao Xin
	Liu Hongfu
	Yang Rui
	Lei Chuan

Key words： Santanghu Basin lacustrine deposit silt-micrite dolostone analcime-sanidine dolostone primary dolomite hydrothermal exhalative deposition

Received: 10 September 2011 Published: 01 February 2012

ZTFLH:

P581

About author: Li Hong，born in 1975，received her Ph.D.degree from the Northwest University in 2006.Now she is working at Geology Department of Northwest University with interests in sedimentology and reservior geology.E-mail: lihong2008@nwu.edu.cn.

Cite this article:

Li Hong,Liu Yiqun,Liang Hao et al. Origin of lacustrine dolostones of the Middle Permian Lucaogou Formation in Santanghu Basin of Xinjiang[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(1): 45-58.

Li Hong,Liu Yiqun,Liang Hao et al. Origin of lacustrine dolostones of the Middle Permian Lucaogou Formation in Santanghu Basin of Xinjiang[J]. JOPC, 2012, 14(1): 45-58.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2012.01.005 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2012/V14/I1/45

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