Lacustrine microbial dolomite of the Middle Permian Lucaogou Formation in r&uuml;mqi，Xinjiang

doi:10.7605/gdlxb.2012.06.008

JOURNAL OF PALAEOGEOGRAPHY ›› 2012, Vol. 14 ›› Issue (6): 767-776. doi: 10.7605/gdlxb.2012.06.008

• SPECIAL ISSUE ABOUT “Origin of Dolostone and Oil and Gas Reservoir” • Previous Articles Next Articles

Lacustrine microbial dolomite of the Middle Permian Lucaogou Formation in rümqi，Xinjiang

Lei Chuan^1，2 Li Hong¹ Yang Rui¹ Cheng Jun³

1 State Key Laboratory of Continental Dynamics，Department of Geology，Northwest University，Xi′an 710069，Shaanxi;2 Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics,Chinese Academy of Sciences，Lanzhou 730000,Gansu;3 Shaanxi Institute of Geological Survey，Xianyang 712000，Shaanxi

Received:2011-09-10 Revised:2012-04-06 Online:2012-12-01 Published:2012-12-01
About author:Lei Chuan，born in 1988，is a master candidate of Lanzhou Center for Oil and Gas Resources，Institute of Geology and Geophysics，Chinese Academy of Sciences.E-mail: leichuan1988@163.com.
About the corresponding author Li Hong，working at Department of Geology，Northwest University，is mainly engaged in sedimentology and reservoir geology.E-mail: lihong2008@nwu.edu.cn.

新疆乌鲁木齐地区中二叠统芦草沟组湖相微生物成因白云石特征^*

雷川^1，2 李红¹ 杨锐¹ 程俊³

1 大陆动力学国家重点实验室，西北大学地质学系，陕西西安710069;2 中国科学院地质与地球物理研究所兰州油气资源研究中心，甘肃兰州730000;3 陕西省区域地质矿产研究院，陕西咸阳712000

通讯作者: 李红，西北大学地质学系讲师，主要从事沉积学和储集层地质学的教学和研究工作。E-mail:lihong2008@nwu.edu.cn。 E-mail:leichuan1988@163.com
作者简介:雷川，男，1988年生，中国科学院地质与地球物理研究所兰州油气资源研究中心硕士研究生。
基金资助:
国家自然科学基金项目（批准号：40802024，41272115）和国家基础科学人才培养基金地质学科科学研究培训项目（编号:XDCX09-13)联合资助

Abstract

Abstract:

The dark-gray，middle to thin-bedded dolostone，limestone，siltstone，and gray or black shale and mudstone，deposited in shallow to open lake settings, are mainly developed in the Middle Permian Lucaogou Formation in southern Hongyanchi section of rümqi in Xinjiang. Dolostone which is rich in organic matter is mainly composed of dolomite and ankerite with small amount of calcite and Mg-calcite.The dolomite ranges from 3 to 10μm in crystal sizes and shows homogeneously dark-red luminescence.Micromorphologies of the dolomite vary from microspherules(5～8μm in diameter)，clusters(about 2μm long)，to anhedral dolomite under the SEM.Microspherules have microlaminae structure called “growth coating” which consists of numerous nanoscale particles in the 60000 times enlarged SEM photomicrographs.Anhedral dolomite which is mainly composed of massive particles(about 0.25μm)in 40000 times enlarged SEM photomicrographs shows the features of microbial mineralization.The above morphologies of dolomite are highly similar to the typical modern microbial dolomite in experiment-culture and natural environments.The δ¹³C_PDB value of dolomite ranges from 1.8‰ to 13.8‰，and δ¹⁸O_PDB value ranges from-12.1‰ to-4.1‰.The higher δ¹³C_PDB value may be the result of isotope fractionation led by methane-producing bacteria.The characteristics of micromorphologies and stable isotope indicate that the precipitation of the Middle Permian dolomite had close relation to activities of anaerobic organisms.

Key words: lacustrine, dolomicrite, micro-spherular dolomite, microlaminae, microbial mineralization, Lucaogou Formation, Middle Permian, Xinjiang

摘要：

新疆乌鲁木齐地区红雁池南剖面中二叠统芦草沟组主要发育浅湖至半深湖背景下的中、薄层深灰色白云岩、灰岩、粉砂岩与中、厚层灰黑色页岩、泥岩互层。白云岩主要由泥晶白云石、铁白云石及少量方解石、高镁方解石组成，富含有机质。白云石粒径约3～10 μm，阴极发光呈现均匀昏暗的砖红色。白云石主要有微球状（直径约5～8 μm）、微簇状（长度约2 μm）及他形（1～10 μm）等3种微形貌。微球状白云石具有显微纹层结构，似为生长纹层，放大至6万倍发现显微纹层是由无数纳米级颗粒构成。他形白云石放大至4万倍发现主要由大量直径约0.25 μm的球状微粒聚集粘结而成，具有微生物矿化的特征。将研究区白云石与现代典型微生物成因白云石相比，其显微形态特征非常相似。研究区白云岩δ¹³C_PDB为1.8‰～13.8‰，δ¹⁸O_PDB为-12.1‰～-4.1‰，偏高的δ¹³C可能是产甲烷菌活动引起有机质碳同位素分馏的结果。以上特征表明，芦草沟组具有特殊形貌白云石的沉淀很可能与厌氧微生物密切相关。

关键词: 湖相, 泥晶白云岩, 微球状白云石, 显微纹层, 微生物矿化, 芦草沟组, 中二叠统, 新疆

CLC Number:

P588.24+5

Lei Chuan, Li Hong, Yang Rui, Cheng Jun. Lacustrine microbial dolomite of the Middle Permian Lucaogou Formation in rümqi，Xinjiang[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(6): 767-776.

雷川, 李红, 杨锐, 程俊. 新疆乌鲁木齐地区中二叠统芦草沟组湖相微生物成因白云石特征^*[J]. 古地理学报, 2012, 14(6): 767-776.

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Lacustrine microbial dolomite of the Middle Permian Lucaogou Formation in rümqi，Xinjiang

新疆乌鲁木齐地区中二叠统芦草沟组湖相微生物成因白云石特征^*

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Lacustrine microbial dolomite of the Middle Permian Lucaogou Formation in rümqi，Xinjiang

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新疆乌鲁木齐地区中二叠统芦草沟组湖相微生物成因白云石特征^*