浅析西藏得几、夏鲁蛇绿岩中地幔橄榄岩的地质意义
Brief Analyses for the Geological Significance of the Mantle Peridotite from the Deji and Xialu Ophiolites, Tibet
摘要: 西藏得几、夏鲁地区蛇绿岩体位于雅鲁藏布江缝合带中段，属日喀则蛇绿岩体，主要由地幔橄榄岩、辉长辉绿岩和基性火山岩等组成。其中地幔橄榄岩主要为方辉橄榄岩，并经历了强烈的塑性变形作用。雅鲁藏布江缝合带是是青藏高原最年轻的缝合带，其中段日喀则蛇绿岩体对古大陆板块的运动和古大洋岩石圈的演化和发展具有重要的研究意义。本文主要对雅鲁藏布江中段日喀则地区蛇绿岩进行野外地质考察，并对其典型的岩石进行样品采集，通过室内显微镜下观察，对岩石样品薄片进行矿物鉴定和定名，并挑选特征明显的岩石样品，进行详细的岩石学研究。研究结果表明研究区地幔橄榄岩经历过部分熔融作用，但两地地幔橄榄岩有着不同的形成环境。
Abstract: The ophiolites in Deji, Xialu, belonging to the Shigatse Ophiolite, outcrops in the middle section of the Yarlung-Zangbo suture zone, Southwest Tibet. The massifs mainly comprise mantle peridotite, gabbro-diabase and basic volcanic rocks. Among these, the mantle peridotite mostly consists of harzburgite with strong plastic deformation. The Yarlung-Zangbo suture zone is the youngest one in the Tibet Plateau, hence study on the Shigatse Ophiolite is of great significance to reveal the palaeocontinental tectonic movement and the evolution and development of ocean lithosphere. Based on the field investigations, representative rocks were sampled for the further indoor researches. Mineral identification and rock naming were conducted on all the samples under the microscope, and then the most typical samples were picked out to carry on detailed study about lithology, suggesting that all the mantle peridotite from the two places experienced partial melting but the ophiolites from the two different places formed in different settings.
文章引用：裴建鑫, 王泽利. 浅析西藏得几、夏鲁蛇绿岩中地幔橄榄岩的地质意义[J]. 自然科学, 2018, 6(4): 261-266. https://doi.org/10.12677/OJNS.2018.64037

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