吉林省南部荒沟山地区中生代花岗岩CHIME定年被引量：41

CHIME dating and its application for Mesozoic granites of Huanggoushan, Jilin Province

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摘要吉林省南部荒沟山地区存在两种类型的中生代花岗岩,一类是以草山、梨树沟和老秃顶子等3个岩体为代表的(角闪)黑云母花岗岩,另一类是以遥林岩体为代表的石榴白云母花岗岩。运用CHIME年龄测定方法对草山和梨树沟岩体中的锆石和独居石进行了年代学研究,获得梨树沟岩体锆石PbO-UO2等时线年龄和权重平均年龄均为(173±10)Ma,草山岩体锆石PbO-UO2和独居石PbO-ThO2等时线年龄分别为(178±8)Ma和(177±3)Ma,权重平均年龄分别为(175±6)Ma和(177±3)Ma。结合本区遥林岩体(石榴白云母二长花岗岩)已有的LA-ICPMS锆石U-Pb年龄犤(176±7)Ma犦,确认荒沟山地区花岗岩形成于175Ma左右的早—中侏罗世,并非以前所认为的晚三叠世,这为从更大范围内讨论中国东部侏罗纪岩浆活动和地球动力学研究提供了重要资料。 There occur two types of Mesozoic granites in Huanggoushan area, Jilin Province: (hornblende)-biotite granite represented by the Caoshan, Lishugou and Laotudingzi plutons, and garnet-bearing muscovite granite represented by the Yaolin pluton. Using CHIME geochronological method, the zircons and monazites from the Caoshan and Lishugou plutons are dated. The PbO-UO2isochron age and weighted average age of the Lishugou pluton are all (173±10) Ma. For the Caoshan pluton, the zircon PbO-UO2and monazite PbO-ThO2isochron ages are (178±8) Ma and (177±3) Ma, and their weighted average ages are (175±6) and (177±3) Ma, respectively. Combined with the LA-ICPMS U-Pb age of (176±7) Ma of zircons from the Yaolin pluton, it is concluded that the Mesozoic granitic magmatism in the Huanggoushan area took place at ～175 Ma of Early-Middle Jurassic, not Late Triassic as previously thought. These age data provide some new information about the studies of the igneous activity and geodynamics of eastern China during Jurassic.

作者孙德有铃木和博吴福元路孝平

机构地区吉林大学地球科学学院日本名古屋大学年代测定综合研究中心中国科学院地质与地球物理研究所

出处《地球化学》 CAS CSCD 北大核心 2005年第4期1-10,共10页 Geochimica

基金国家自然科学基金(40272045) 全国油气资源战略选区调查与评价项目(XQ-2004-07)~~

关键词 CHIME年代测定锆石独居石中生代花岗岩荒沟山地区吉林省 CHIME geochronological dating zircon monazite Mesozoic granite Huanggoushan area Jilin Province

分类号 P597 [天文地球—地球化学]

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