The age of the Gaojiacun mafic-ultramafic intrusive complex in the Yanbian area,Sichuan Province: Geochronological constraints by U-Pb dating of single zircon grains and ^(40)Ar/^(39)Ar dating of hornblende  

作　　者：ZHUWeiguang DENGHailin LIUBingguang LIChaoyang QINYu LUOYaonan LIZhide PIDaohui 

机构地区：[1]OpenLaboratoryofOreDepositGeochemistry.InstituteofGeochem-istry.ChineseAcademyofSciences,Guiyang550002,China [2]InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China [3]GeologicalTeam601,BureauofMetallurgicalGeologyandMineralExploraTion.Panzhihua617027,China [4]BureauofGeologyandMineralResourcesofSichuanProvince.Chengdu610081,China [5]ChinaUniversityofGeosciences,Wuhan430074,China [6]GraduateSchool,ChineseAcademyofSciences.Beijing100039.China

出　　处：《Chinese Science Bulletin》2004年第10期1077-1085,共9页

摘　　要：The Gaojiacun mafic-uitramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ^40Ar/^39Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of 'Yanbian Ophiolite'. It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantle plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province.The Gaojiacun mafic-ultramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ^(40)Ar/^(39)Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of 'Yanbian Ophiolite'. It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantl3 plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province.

关 键 词：角闪石 高家村 超镁铁质侵入复合物 地质年代学 U-PB定年 单晶锆石 

分 类 号：P597[天文地球—地球化学]