古地理学报2012，Vol.14Issue(1)：59-68,10.
内蒙古二连盆地白音查干凹陷下白垩统湖相白云岩成因
Origin of the Lower Cretaceous lacustrine dolostones in Baiyinchagan Sag of Erlian Basin, Inner Mongolia
摘要
Abstract
In the Early Cretaceous, there was a set of lacustrine dolostones in the Baiyinchagan Sag with the strong rift extension and high geothermal anomaly. The dolostones were rich in special minerals including ankerite, natrolite, clay sized feldspar ( albite, potash feldspar) etc., and were only developed in semi-deep-deep lacustrine facies. The dolostone is controlled by NE-trending synsedimentary faults and distributed mainly in downthrown side of fault zone in northern steep slope zone and southern ramp zone adjacent to the central part in this sag. The lacustrine dolostone is mainly composed of ankerite and paragenetic minerals (natrolite, feldspar, barite, sjogrenite, etc.). Its texture can be divided into three types; micrite, microcrystalline and fine-medium grained porphyritic texture ( multivariate mineral assemblage). The dolostone also has obvious rock fabric characteristics of hydrothermal sedimentation, including lamellar structure, hydrothermal clastic texture, starrily structure, contemporaneous plastic deformation and net vein structure. Based on the above preliminary analyses, we think that the formation of the lacustrine dolostone is the sedimentation with deep hydrothermal fluids participation, namely hydrothermal sedimentary dolostone.关键词
内蒙古/二连盆地/白音查干凹陷/下白垩统/湖相/热水沉积白云岩Key words
Inner Mongolia/ Erlian Basin/ Baiyinchagan Sag/ Lower Cretaceous/ lacustrine facies/ hydrothermal sedimentary dolostone分类
天文与地球科学引用本文复制引用
郭强,钟大康,张放东,刘新刚,范凌霄,李君军..内蒙古二连盆地白音查干凹陷下白垩统湖相白云岩成因[J].古地理学报,2012,14(1):59-68,10.基金项目
国家自然科学基金项目(编号:41072104)和国家973计划项目(编号:2011CB201104)联合资助 （编号:41072104）
