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Improvement of in situ LA-ICP-MS U-Pb dating method for carbonate minerals and its application in petroleum geology

Science China Earth Sciences 2023年第12期66卷 2914-2929页

作者： Xuesong Lu Lili GUI Weiyan CHEN Shaobo LIU Shitou WU Junjia FAN Qiang LIU Jing SUN Liangliang ZHANG Yang XIAO Wenxia YANG Rizhou CAO Research Institute of Petroleum Exploration and Development Beijing 100083China Key Laboratory of Basin Structure and Hydrocarbon Accumulation CNPCBeijing 100083China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China School of Geosciences China University of Petroleum(Beijing)Beijing 102249China Institute of Earth Sciences China University of Geosciences(Beijing)Beijing 100083China Sichuan Chuangyuan Weipu Analytical Technology Co. Ltd.Chengdu 610059China School of Geosciences Changjiang UniversityWuhan 430100China Research Institute of Exploration and Development Daqing Oilfield CoLtd.Daqing 163712China

In situ carbonate U-Pb dating is gaining popularity,and it has great potential for application in petroleum ***,the low U content(<10μg/g)and high common Pb content of carbonate minerals,along with the uneven distrib... 详细信息

In situ carbonate U-Pb dating is gaining popularity,and it has great potential for application in petroleum ***,the low U content(systematic offset caused by differences in down-hole element fractionation and reducing the consume of reference *** on the heterogeneous distribution of U and Pb contents in carbonate minerals,the method of grid screening and setting ablation spots during screening were used to quickly select domains with high U and low common Pb,which improves the efficiency of setting laser spots and the success rate of dating,as well as reduces the experimental time and economic *** accuracy and success rate of carbonate U-Pb dating were effectively improved by improving the experimental method,and the technique was applied to two carbonate samples with low U and high common Pb contents that were difficult to date by traditional *** two samples are the saddle dolomite in the central Sichuan Basin and the calcite cement in the sandstone reservoir of the Cretaceous Qingshuihe Formation in the South Junggar *** robust ages have been obtained,which constrains the timing of the diagenetic and

关键词： Carbonate U-Pb dating LA-SF-ICP-MS Ablation craters Fractionation effects systematic offset Critical time limitation

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