西昆仑库地赛图拉岩群片麻岩地球化学特征及其意义

发布时间：2018-01-03 06:37

本文关键词：西昆仑库地赛图拉岩群片麻岩地球化学特征及其意义　出处：《西南科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：西昆仑造山带位于青藏高原西北部,北邻塔里木板块,南以喀喇昆仑断裂与羌塘地块相接,东部阿尔金断裂将西昆仑与东昆仑和阿尔金山分割,西段沿帕米尔高原延伸进入伊朗、巴基斯坦境内,也是"中央造山带"的重要组成部分,具有复杂的构造演化历史。对赛图拉岩群片麻岩的岩相学、岩石地球化学等方面研究,依据矿物组合特征,结合主量元素、微量元素、稀土元素等恢复原岩组合和原岩建造,并进一步判别其物源性质和构造环境。赛图拉岩群A组片麻岩主量元素具有高硅铝、富钾钠的特点,微量元素上地壳标准化蛛网图中表现出现Sr、P、Ti相对于大陆上地壳有弱的亏损。稀土元素总体呈现了轻稀土富集,重稀土平坦的特点,无Ce异常,中等偏上的Eu负异常。运用原岩判别图解可以得出赛图拉岩群A组片麻岩的原岩以杂砂岩、泥质砂岩为主,少部分具有火成岩成分。通过赛图拉岩群A组主量元素、微量元素、稀土元素特征以及原岩恢复、构造环境判别,得出赛图拉岩群A组片麻岩以泥砂岩为主,少量含有火成岩的成分,其形成的构造环境为被动大陆边缘-活动大陆边缘-大陆岛弧。180交达克铁多金属矿赋存于赛图拉岩群A组片麻岩与提热艾力组浅变质碎屑岩中,上升的含矿热液沿断裂裂隙运移通道与围岩发生交代作用,热液中金的溶解度迅速降低并沉淀成矿。
[Abstract]:The West Kunlun orogenic belt is located in the northwest of the Qinghai-Tibet Plateau, bordering the Tarim plate to the north, the Karakoram fault to the south and the Qiangtang block to the south, and the eastern Altun fault to divide the West Kunlun from the East Kunlun and the Aljin Mountains. The western section extends into Iran along the Pamir Plateau and Pakistan is also an important part of the Central orogenic Belt with a complicated history of tectonic evolution. Petrography of the gneiss of the Seitura Group. According to the characteristics of mineral assemblage, combined with principal elements, trace elements, rare earth elements and so on, the original rock assemblage and the original rock formation have been restored. The main elements of group A gneiss in the group A are characterized by high Si-Al, rich in potassium and sodium, and Sr-P appears in the standardized cobwebs of the crust on trace elements. Compared with the upper continental crust, Ti has a weak depletion. The rare earth elements generally show the characteristics of light rare earth enrichment, heavy rare earth flat, and no ce anomaly. The negative EU anomaly on the middle side. By using the original rock discriminant diagram, it can be concluded that the protolith of group A gneiss of the Saitura group is mainly composed of complex sandstone and argillaceous sandstone. A few of them have igneous rocks. By means of the main elements, trace elements, rare earth elements and the recovery of the original rocks, the gneiss of group A of the Seitura rock group is dominated by mudstone. A small amount of igneous rock. The tectonic setting is passive continental margin, active continental margin and continental island arc. 180 Jiadak iron polymetallic deposit occurs in gneiss group A and shallow metamorphic clastic rock of Tieroli formation. The upwelling ore-bearing hydrothermal fluid moves along the fracture fissure channel and metasomatism occurs in the surrounding rock, and the solubility of gold in hydrothermal solution decreases rapidly and precipitates to form ore.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P59;P588.345

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