| 摘要: |
| 在1∶25万炉霍幅区域地质调查中,于川西高原炉霍-道孚一带发现了大量的蚀变单辉橄榄岩、蛇纹石化辉石岩、辉长岩、蚀变玄武岩及放射虫硅质岩,它们多呈构造残片状散布于中上三叠统如年各岩组变质砂板岩复理石地层中。通过对这些残片的深入研究,笔者认为它属蛇绿岩组合,并可以重塑较完整的蛇绿岩层序,暂以道孚蛇绿岩称之,道孚蛇绿岩的发现为重新认识炉霍-道孚一带的大地构造属性、区域构造格架及地层区划具有极其重要的意义。 |
| 关键词: 炉霍-道孚 蛇绿岩 构造残片 初始洋盆 |
| DOI： |
| 附件 |
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| 基金项目:中国地质调查局“1∶25万炉霍幅和马尔康幅区域地质调查” |
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| Discovery and significance of the Luhuo-Dawu ophiolites in western Sichuan |
| ZHANG Kuan-zhong, LI Zhen-jiang, HUANG Cheng, XU Gang |
| (Regional Geological Survey, Sichuan Bureau of Geology and Mineral Resources, Shuangliu 610213, Sichuan, China) |
| Abstract: |
| The wide-spread altered clinopyroxene peridotite,serpentinized pyroxenite,gabbro,altered basalt and radiolarian siliceous rocks recognized during the geological surveying of 1∶250 000 Luhuo Sheet occur as tectonic remnants scattered in the metamorphic sandstone and slate flysch strata of the Middle to Upper Triassic Runiange Formation.These remnants are believed to be the ophiolitic assemblages that may reconstruct the complete ophiolite sequences,and thus named the Dawu ophiolites.The discovery of the Dawu ophiolites has important implications for the refinement of the tectonic settings,regional tectonic framework and stratigraphic division of the Luhuo-Dawu zone. |
| Key words: Luhuo-Dawu ophiolite tectonic remnants nascent ocean |
