A STUDY OF PRE-CAMBRIAN BASEMENT IN THE QAIDAM BASIN
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摘要: 重力、航磁、地震、遥感、地表地质等资料的研究结果表明,柴达木盆地基底存在着中央断裂带。中央断裂带将柴达木盆地基底分为南北性质截然不同的两部分,说明柴达木盆地存在吕梁期以前的古陆核。结合中酸性岩浆岩氧化物成分构造环境判别结果,进一步可以推断古阿尔金洋的存在,使古秦祁昆洋的范围扩大。阿尔金运动使阿尔金洋封闭,岛弧成陆,形成前寒武纪的褶皱镶嵌边。Abstract: Based on data of gravity survey, seismic exploration, aerial magnetical survey and surface geology, the central fault belt was identified in the Qaidam Basin. The basin was divided into two differnt parts by the fault and indicated existence of old crystaline continental kernel pre-Wutai movement. In accordance with geochemical data of intermediatoacid intrusives, a conclusion can be drawn that there was an old altyn Ocean, which expanded the scope of the paleo-Qing-Qi-Kun Ocean. The Altyn Ocean was closed during the Altgn Movement and the arc became pre-Cambrian folded accreted belts.
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Key words:
- Qaidam Basin /
- central fault belt /
- Pre-Cambrian basement /
- the old Altyn Ocean /
- folded accreted belts
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