摘要
中国阿尔泰具有古元古代-中元古代-新元古代基底,其间可能经历了四次主要地质事件,对阿尔泰前寒武系的研究是确定阿尔泰—蒙古微大陆存在的基础;哈巴河群时代为震旦纪-中奥陶世,延伸约1500km,对哈巴河群时代及其规模的讨论是确定阿尔泰—蒙古微大陆存在最重要的依据;东锡勒克组为两大陆碰撞后松弛阶段的产物,白哈巴花岗岩形成于后碰撞环境,对东锡勒克组和白哈巴花岗岩的研究是确定阿尔泰—蒙古微大陆存在的重要依据。通过上述三方面的研究明确了阿尔泰—蒙古微大陆的存在,并厘定了它的南北边界,在此基础上通过对哈巴河群的岩石地球化学研究表明阿尔泰—蒙古微大陆是一个主要由元古宇物质组成的不成熟的微大陆。
Chinese Altai has proterozoic basement, and probably experienced four major events during Proterozoic era. Research about Precambrian basement is the base of dertermination of Altai-Momgolia microcontinent. The span of Hababe group extending about 1500 kilometers is from Sinian to Middle Ordovician and is belived to be continental margin sediment of Altai-Mongolia microtinent. Research about Habahe group is the key to determine Altai-Mongolia microtinent. Dongxileke group formed during the relaxing stage after two continent （Altai-Mongolia and Siberia） collided, Baihaba granite formed during post-collional tectonic environment. Research about Dongxileke group and Baihaba granite is important evidence of determining Ahai-Momgolia microcontinent. The northern and southern edges of Altai-Momgolia microcontinent are ascertained. Ahai-Mongolia microcontinent is a immature continent mainly composed of proterozoic matter according to geochemical data of Habahe group.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期1369-1379,共11页
Acta Petrologica Sinica
基金
本文受国家重要基础研究发展规划项目"中国西部中亚型造山与成矿"综合研究课题"中亚型造山与成矿综合研究"(编号2001CB409810)资助.
关键词
阿尔泰
微大陆
哈巴河群
基底
Altai, Microcontinent, Habahe group, Basement
