^(40)Ar/^(39)Ar Age and Geological Significance of Lamprophyres in Pishan on the SW Margin of the Tarim Terrane, NW China

作     者：Ariel BOVEN 

作者机构：Laboratory of Geochronology Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2003年第77卷第1期

页      面：36-43页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the China-Flander S&T Cooperation Project 

主　　题：Tarim western Kunlun Triassic lamprophyre Ar-Ar age 

摘      要：The dike swarm of lamprophyres at Pishan on the SW margin of the Tarimterrane is composed of ultra-potassic lamprophyres that have intruded into the Proterozoichornblende schists. ^(40)Ar/^(39)Ar dating data suggest that the isochron ages for phlogopite andwhole rock separates of the lamprophyres are 231.7+-0.3 Ma and 228.5+-0.3 Ma, *** data indicate that the dikes were derived from a subduction-related or metasomatizedmantle. During the Middle-Late Triassic the western Kunlun area entered the post-orogeny period, andthus the occurrence of the dike swarm in the study area may have been controlled by underplating.