阿尔金山中段清水泉—茫崖蛇绿构造混杂岩带地质特征
The geological features of ophiolite tectonic mixtite belt from Qingshuiquan to Mangnai in the middle section of Altgn Tagh
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摘要: 清水泉—茫崖蛇绿构造混杂岩带沿阿尔金山南坡分布,呈醒目的"绿色岩带",其主要由蛇绿岩、蛇绿岩上覆岩系和元古代外来岩片或岩块组成,现多为构造透镜体,蛇绿岩上覆岩系具远洋深海沉积特征;岩石地球化学资料研究证明,蛇绿岩中的玄武岩与洋内岛弧拉斑玄武岩相似;同位素测年结果显示蛇绿岩形成于早古生代,蛇绿岩源自亏损的软流圈地幔,同时有富集地幔物质加入,暗示早古生代研究区曾出现过小洋盆构造环境。Abstract: The ophiolite tectonic mixtite belt from Qingshuiquan to Mangnai, appearing strike "green belt", distributed on the south slope of Altgn Tagh.And it is composed of ophiolite, overlying rock series with ocean deep-sea desposit characteristics and exotic block, which are tectonic lens now.The lithochemistry data testify that basalt in ophiolite is similar to ocean inner arc tholeiite.Results of isotopic age prove that this ophiolite was formed in the Early Paleozoic and originated from depletion flow agesphere mantle and the enrichment mental matter joined at the same time.They imply survey area is ever a small ocean basin.
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