甘肃北山南带中段志留系的发现及地质意义

Discovery of Silurian in middle section of south belt of Beishan mountain and its geological significance, Gansu

No.3 Institute of Geology and Mineral Exploration, Gansu Provincial Bureau of Geology and Mineral Exploration and Development, Lanzhou 730050, China

摘要: 通过1:25万马鬃山幅区调填图资料,对小草湖-窑洞梁一带的火山岩,从岩石组合、变质变形、火山系列等方面进行了进一步的研究。并据其岩石组合、变形与变质程度等特征进行区域对比及在窑洞梁基性火山岩中获Rb-Sr等时线年龄为417.24±19.29Ma和垒墩子东山侵入于该套火山岩中的碱长花岗岩的Rb-Sr等时线年龄为283Ma,将其时代置于志留纪。
- 北山南带中段 /
- 造山带 /
- 志留纪
Abstract: The paper made more research on volcanic rock in Xiaocaohu-Yaodongliang area about rock association metamorphic trait and deformation intensity,volcanic sequence etc on the basis of mapping data of the 1:250000 Mazongshan sheet. And make a comparison of regions on the basis of rock association metamorphic trait and deformation intensity etc,and the whole-rock Rb-Srage of the Yaodongliang basic volcanic rock is in the range of 417.24±19.29 Ma,the alkali-feldspar granite which irrupted the basic volcanic rock and where Leidunzi eastern mountain is 238 Ma,so its age belongs to the Silurian.
- the middle section of south belt of Beishan mountain /
- orogenic belt /
- Silurian

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