LA-ICP-MS U-Pb geochronology of calcites reveals multiphase tectonic activities and associated fluid flow in Western Shunbei area,NW China  

作　　者：Shaofeng DONG Jun HAN Jianxin ZHAO Donghua YOU 

机构地区：[1]State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,SINOPEC,Beijing,100083,China [2]School of Geoscience and Technology,Southwest Petroleum University,Chengdu,610500,China [3]Radiogenic Isotope Laboratory,Centre for Microscopy and Microanalysis(CMM),The University of Queensland,Brisbane St Lucia,QLD,4072,Australia [4]SINOPEC Northwest Oilfield Branch,Urumqi,830011,China [5]Wuxi Institute of Petroleum Geology,Petroleum Exploration and Production Research Institute,SINOPEC,Wuxi,214126,China

出　　处：《Science China Earth Sciences》2025年第4期1180-1188,共9页中国科学(地球科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.42072139)。

摘　　要：Here we performed LA-ICP-MS U-Pb geochronology of individual calcite cements from different regions within a single strike-slip intra-cratonic fault in the Western Shunbei area,Tarim Basin,NW China.U-Pb geochronology of calcites unravel two separate phases(456±12 and 442±14 Ma)of tectonic activities during Middle Caledonian orogeny,which are slightly later than the final closure of ancient Kudi ocean and subduction of Eastern Kunlun terrane,respectively.These disparities could be attributed to compressional stress transmission and associated fault propagation within the sedimentary basin.LA-ICP-MS analysis integrated with theoretical calculation further suggests that the original fluid dominantly inherited the geochemical signatures of host-carbonate rocks,followed by the influxes of hot silica-rich fluid,particularly in the periphery of SHB53X well.U-Pb geochronology thus not only unravels regional tectonism and associated fluid flow in complex sedimentary basin but also provides reliable geochronological information for the evolutionary process of the Proto-Tethys Ocean.

关 键 词：Calcite U-Pb dating Fluid flow Caledonian orogeny Proto-Tethys Ocean Tarim Basin 

分 类 号：P597[天文地球—地球化学]