Characteristics and causes of analcime distributed in dolostone of the Member 3 of Paleogene Shahejie Formation in Beitang sag, Bohai Bay Basin
Lin Peixian1,Lin Chunming1,Yao Yue2,Wang Bingjie1,Li Le3,Zhang Xia1,Zhang Ni1,4
1 State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210046,Jiangsu, 2 Earth Science Department,Rice University,Houston TX 77005, 3 Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,Hubei, 4 School of Material Engineering,Jinling Institute of Technology,Nanjing 211169,Jiangsu
Abstract：There are many minerals in the dolostone of the Member 3 of Paleogene Shahejie Formation from Beitang sag of Bohai Bay Basin. X-ray diffraction results show that the dolostone contains dolomite,analcime,quartz,feldspar,clay mineral,pyrite,calcite, etc. and the average content of analcime is about 38.8%. In this paper,based on a vast amount of data from core drilling, thin sections,scanning electron microscope,electron probe and geochemistry characteristics,we study the characteristics and causes of analcime in the Member 3 of Shahejie Formation in detail. Analcime occurs as two types,namely,laminae type and filling type. The former one,mainly laminated and sometimes nodular,is interbedded with dolomite. The other one is formed later and distributed in the crack as a kind of interstitial fillings. These two kinds of analcime are different in many aspects,such as existence form,crystal morphology,and associated minerals, etc. The laminae type is associated with dolostone,and the size of crystal is under 0.04,mm. However,the filling type is associated with pyrite and organic matter,and the size of crystal is above 0.04,mm. Based on the major-trace element and carbon-oxygen isotope analysis,the average salinity is 28.8‰ and the average Sr/Ba value is 2.93. It indicates that the sedimentary environment was alkaline-salty during the depositional period of Member 3 of Paleogene Shahejie Formation in Beitang sag of Bohai Bay Basin,which is beneficial to form analcime. The electron probe chemistry analyses show that the analcime of laminae type and that of filling type have different sources. The source of the analcime of laminae type is clay mineral,and the source of the analcime of filling type is related to hydrothermal fluid. Compared with other similar analcime-bearing dolostone basins in China,such as Jiuxi Basin,Santanghu Basin,we gave analyses on petrology characteristics,REE and formation temperature. The results show that the analcime in the study area has two causes: Analcime of laminae type is formed through deposition process,and analcime of filling type is formed through hydrothermal fluid process.
Lin Peixian,Lin Chunming,Yao Yue et al. Characteristics and causes of analcime distributed in dolostone of the Member 3 of Paleogene Shahejie Formation in Beitang sag, Bohai Bay Basin[J]. JOPC, 2017, 19(2): 241-256.
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