| 甘肃龙首山区及马衔山区前震旦纪地层简介 |
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| 引用本文： | 向鼎璞,魏丁新,蔡体梁.甘肃龙首山区及马衔山区前震旦纪地层简介[J].地质科学,1975,10(1):56-64. |
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| 作者姓名： | 向鼎璞 魏丁新 蔡体梁 |
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| 作者单位： | 甘肃省第一区测队 |
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| 摘 要： | 甘肃省前震旦系主要分布于祁连山及阿拉善区,可分南北两带。北带分布于龙首山及北大山一带,前人称“阿拉善群”,1967年,我队在区域地质调查时将其改为龙首山群,向西出露在三危山至东巴兔山一带的前震旦系称“敦煌群”;南带分布于阿尔金山及中祁连山一带,向东出露在兰州马衔山一带的前震旦系称“马衔山群”。此外,在北山区的洪格尔吉山及雅布赖西山等地尚有零星出露。
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A BRIEF INFORMATION ABOUT PRE-SINIAN STRATA OF THE REGIONS MTS. LONGSHOUSHAN AND MAXIANSHAN, KANSU PROVINCE |
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| Abstract: | The Longshoushan group and Maxianshan group are mainly distributed in the stretches of Mts. Longshoushan and Maxianshan. The Longshoushan group is primarily composed of schists and gneisses partly with migmatization, originated from clastic rock, carbonate and intermediate-basic volcanic rock which were mesometamor-phosed afterwards. And the Maxianshan group which is characterized by the predominance of gneisses seems to be more strongly migmatized. According to iso-topic age determination the calciphyre in the lower part of Longshoushan group has been calculated as 1479 m.y., the Baijiazui gneissic granite intruded in the Longshoushan group has an age of around 1718-1786 m.y., and the pegmatitic granite has been dated at 1740 m.y. Both the two groups are overlain disconformably by the fossili-ferous Sinian rocks and, therefore, can be regarded as Pre-Sinian. |
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