内蒙古贺根山蛇绿岩的形成时代:来自辉长岩LA-ICP-MS锆石U-Pb年龄的证据
Age of Ophiolite Formation in Hegenshan,Inner Mongolia:Evidence from LA-ICP-MS Zircon U-Pb Dating of Gabbro
张治国 1靳琪 1刘希军 2唐国强 1杨有海 1肖让 1田昊3
作者信息
- 1. 河西学院土木工程学院,甘肃 张掖 734000
- 2. 桂林理工大学,广西 桂林 541004;中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆 乌鲁木齐 830011
- 3. 桂林理工大学,广西 桂林 541004
- 折叠
摘要
内蒙古贺根山蛇绿岩是兴-蒙造山带最年轻的蛇绿岩带,被认为是华北板块和西伯利亚板块碰撞的缝合线向东延伸的部分,其代表的古洋盆的形成和关闭时限,一直受到地学界的密切关注.采用LA-ICP-MS锆石U-Pb同位素方法,获得贺根山蛇绿岩中辉长岩的年龄为357.9±1.5Ma,这代表了贺根山蛇绿岩的结晶年龄.结合前人研究成果,推断贺根山蛇绿岩形成于洋内弧后盆地环境.
Abstract
The Hegenshan ophiolite in Inner Mongolia is the youngest ophiolite belt in the Xing'an Mongolian orogenic belt,considered to be the eastward extension of the suture line from the final collision between the North China Plate and the Siberian Plate.The timeframe for the formation and closure of the paleo-oceanic basin it represents has garnered significant attention from the geoscientific community.Using the LA-ICP-MS zircon U-Pb isotope method,the age of the gabbro in the Hegenshan ophiol-ite was determined to be 357.9±1.5 Ma,which represents the crystallization age of the Hegenshan ophiolite.Combined with the results of previous research,this study suggests that the Hegenshan ophiolite formed in an intra-oceanic back-arc basin environ-ment.
关键词
贺根山蛇绿岩/辉长岩/锆石U-Pb同位素方法/洋内弧后盆地Key words
hegenshan ophiolite/gabbro/zircon U-Pb isotope method/back-arc basin引用本文复制引用
出版年
2024
NETL
NSTL
万方数据