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The characteristics of cave fillings of carbonates in the Lower Ordovician and their diagenetic environments in northern Tarim basin

Zhang Cong1,Yu Bingsong1,Fan Tailiang1,Huang Wenhui1,Zhu Jingquan2,Wu Shiqiang21.The State Key Laboratory of Geological Process and Mineral Resources,China University of Geosciences,Beijing 100083,China2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China  
In order to rationally analyze and evaluate the developing and preserving condition of carbonate caves in burial diagenetic environment,the mineralogy and geochemistry of the host Lower Ordovician dolomites and their cave fillings in the northern Tarim Basin have been studied in details,and the diagenetic environment of the cave fillings has been recovered.It has been discovered that the cave fillings show obvious generational features.There are at least four generations of fillings from the bedrock to the center of a cave.Ordinarily,they are ivory-white dolomite,iron-dipped high magnesium calcite,achromatic transparent dolomite and euhedral quartz.The analytical data of carbon and oxygen stable isotope,trace elements and REE compositions show that the cave fillings of carbonates were formed in a high-temperature and burial environment,instead of an exposure environment;that the dolomite fillings of the first and the third generations may have deposited in a relatively reductive and high saline condition;that the calcite fillings of the second generation may have formed under a relatively oxygenic and lower saline environmental conditions,which is corresponding to the tectonic uplift in the Cretaceous.
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