摘要: |
西秦岭天水地区关子镇蛇绿岩由变质基性火山岩(斜长角闪片岩)和蛇纹岩、变辉石岩、变辉长岩等构造岩块组成。其中的变质基性火山岩具有N-MORB的地球化学特征,显示关子镇蛇绿岩是洋脊型蛇绿岩残片,是新元古代—早古生代期间西秦岭李子园-关子镇-武山洋盆扩张过程中岩浆活动的产物,代表了东秦岭商丹早古生代古缝合带在西秦岭造山带向西延伸的组成部分。 |
关键词: 蛇绿岩,古缝合带,N-MORB,天水,西秦岭 |
DOI: |
分类号:P588.12+5;P588.14+5 |
基金项目:国家自然科学基金重点项目(编号:40234041),教育部科学技术研究重点项目(编号:104175),国土资源部“十五”科技项目(批准号:20010201),中国地质调查局地质调查项目(编号:200013000154)资助。 |
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Definition of the Guanzizhen ophiolite in Tianshui area,western Qinling, and its geological significance |
PEI Xianzhi1 DING Saping1 2 HU Bo1 LI Yong1 ZHANG Guowei3 GUO Junfeng1
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Abstract: |
The Guanzizhen ophiolite in the Tianshui area, western Qinling, is composed of metabasic volcanic rocks (amphibolite) and tectonic blocks of serpentinite, metapyroxenite and metagabbro. Of these rocks, metabasic volcanic rocks have the geochemical feature |
Key words: ophiolite,paleosuture zone,N-MORB,Tianshui,West Qinling, |