Occurrence of Mafic Rocks within Ediacaran Strata in the Aksu Region,NW Tarim Craton,and its Geological Implications  

作　　者：XIE Hongzhe ZHU Xiangkun WANG Xun HE Yuan SHEN Weibing 

机构地区：[1]MNR Key Laboratory of Isotope Geology,SinoProbe Laboratory,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第5期1244-1254,共11页地质学报（英文版）

基　　金：supported by funding from the National Key Research and Development Program of China(Grant No.2022YFF0800100);National Natural Science Foundation of China and the China Geological Survey(Grant No.U2244210)。

摘　　要：The Tarim Craton is an ancient Precambrian continental block,and detailed knowledge of its thermo-tectonic history is crucial for understanding the early history of continental evolution.Abundant layered mafic rocks,which have commonly been regarded as basalts,occur within the Ediacaran Sugetbrak Formation(Fm.)in the Aksu region of the northwestern Tarim Craton.Clear intrusive features have now been discovered,including mafic rocks truncating Ediacaran sedimentary layers,exhibiting an intrusion-baked margin where they interact with both the overlying and bottom wall rocks,and displaying a fine-grained transition zone from their interior to their margins.The new findings demonstrate that these mafic rocks within the Aksu Ediacaran strata were not erupted basalts but instead are intrusive diabase dykes.Therefore,these mafic rocks cannot be used to constrain the timing of the Sugetbrak Fm.in the Aksu area,nor as marker layers for regional stratigraphic correlation.Furthermore,the Ediacaran thermo-tectonic evolution in this region,deduced from the assumption that the mafic rocks are lavas,needs to be revised.

关 键 词：TECTONICS STRATIGRAPHY mafic rocks NEOPROTEROZOIC Tarim Craton 

分 类 号：P534.3[天文地球—古生物学与地层学] P535[天文地球—地质学] P542