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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2008-03
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Characteristics of fluid inclusions in the barite of lacustrine hydrothermal sedimentary rock from the Lower Cretaceous Xiagou Formation in Qingxi sag,Jiuquan basin,China

WEN Hua-guo1,ZHENG Rong-cai1,Hai-ruo QING2,FAN Ming-tao3,WU Guo-xuan4,XIA Pei-fen4,WANG Man-fu3,SANG Ting-yuan3,LIAO Yi1,CHEN Hao-ru11.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;2.Department of Geology,University of Regina,Regina SK Canada S4S OA2;3.Yumen Oil-f ield Company of CNPC,Jiuquan 735019,China;4.State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
Based on the analysis of geologic background and rock fabric,the authors study the fluid inclusions in the barite of the lacustrine hydrothermal sedimentary rock from the Lower Cretaceous Xiagou Formation in the Qingxi sag of Jiuquan basin.On the basis of optical observations and microthermometric study,four types of fluid inclusion in barite cement are recognized: the aqueous liquid-rich inclusions,the halite-bearing multiphase inclusions,the liquid only,the vapor only,and two types of the fluid inclusions in clastic barite are recognized: the aqueous liquid-rich inclusions and liquid only.The mineralizing fluid of the barite cement and clastic barite is NaCl-H2O brine system.The temperature is 160~200℃ and 120~140℃,the salinity(NaCl) is 20%~22% and 18%~20%,the density is 1.06~1.2 g/cm3 and 1.06~1.11 g/cm3 and the mineralization pressure is 150~180 MPa and 30~45 MPa.Integrated with Sr isotope analysis,the authors figure that the mineralizing fluid is the mid-low temperature,mid-high salinity and mid-high density mixed hydrothermal brine which consists of the deep circulating lake water and a little magmatic water.The barite cement is formed by the overprinting and coupling of hydrothermal boiling and the intermingling of the mineralizing fluids in the early stage,and the clastic barite is only formed by the hydrothermal intermingling,dilution and precipitation in the late stage.Both of them are the chemical precipitation products in different stages and different ways in the same hydrothermal fluid.The barite cement is formed in the vent,and the clastic barite is formed in the open system where is relatively far away from the vent,with the meteoric water(lake water) injected,the temperature,salinity,density and pressure of the clastic barite are lower than the fomer.The fuild characteristics and origin of the barite minerals can lay the foundation for the fluid properties,genesis and origin analysis of the lacustrine hydrothermal sedimentary rock from Xiagou Formation in the area.
【Fund】: 国家自然科学基金资助项目(40672073);; 教育部博士点基金资助项目(20060616014)
【CateGory Index】: P611.5
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