秦-祁-昆造山带元古宙副变质岩层碎屑锆石年龄谱研究  

Detrital zircon population of Proterozoic meta- sedimentary strata in the Qinling-Qilian-Kunlun Orogen.

作　　者：陆松年 李怀坤 王惠初 陈志宏 郑健康 相振群 

机构地区：[1]CGS, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China

出　　处：《岩石学报》2009年第9期2195-2208,共14页Acta Petrologica Sinica

基　　金：国家自然科学基金重点项目(400320 10 - C)资助

摘　　要：根据秦-祁-昆造山带中北大河岩群、湟源岩群、化隆岩群、金水口岩群、陡岭岩群和秦岭岩群等副变质岩层碎屑锆石年龄谱资料,这些原定为古元古代的地层,至少包括测年样品在内的部分地层的时代应属中元古代或新元古代初期。研究资料还显示上述碎屑岩层具有大量中元古代早期的物源,而古元古代蚀源物质较匮乏。因此,上述副变质岩层显示出相近的碎屑锆石年龄谱特征。According to the data of detrital zircon population the Beidahe, Hualong, Huangyuan, Jinshnikou, Douling and Qinling complex-groups, which are thought to he Palaeoproterozoic in age before, at least part of the strata including all selected samples should belong to the Late Mesoproterozoic or Early Neoproterozoic. The data also illustrate that the eroded area of the strata are characterized by developed Early Mesoproterozoic materials, hot only less Palaeoproterozoic ones. So all involved samples show a similar feature of the detrital zircon population.

关 键 词：造山带 元古宙 变质 碎屑岩层 碎屑锆石年龄 DETRITAL zircon 中元古代早期 古元古代 北大河岩群 materials belong to 研究资料 新元古代 秦岭岩群 地层 data thought 谱特征 样品 物质 

分 类 号：P58[天文地球—岩石学]