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  本文關鍵詞：西昆侖庫地賽圖拉巖群片麻巖地球化學特征及其意義　出處：《西南科技大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 西昆侖造山帶 賽圖拉巖群 地球化學 原巖恢復 構造環(huán)境

【摘要】：西昆侖造山帶位于青藏高原西北部,北鄰塔里木板塊,南以喀喇昆侖斷裂與羌塘地塊相接,東部阿爾金斷裂將西昆侖與東昆侖和阿爾金山分割,西段沿帕米爾高原延伸進入伊朗、巴基斯坦境內,也是"中央造山帶"的重要組成部分,具有復雜的構造演化歷史。對賽圖拉巖群片麻巖的巖相學、巖石地球化學等方面研究,依據(jù)礦物組合特征,結合主量元素、微量元素、稀土元素等恢復原巖組合和原巖建造,并進一步判別其物源性質和構造環(huán)境。賽圖拉巖群A組片麻巖主量元素具有高硅鋁、富鉀鈉的特點,微量元素上地殼標準化蛛網圖中表現(xiàn)出現(xiàn)Sr、P、Ti相對于大陸上地殼有弱的虧損。稀土元素總體呈現(xiàn)了輕稀土富集,重稀土平坦的特點,無Ce異常,中等偏上的Eu負異常。運用原巖判別圖解可以得出賽圖拉巖群A組片麻巖的原巖以雜砂巖、泥質砂巖為主,少部分具有火成巖成分。通過賽圖拉巖群A組主量元素、微量元素、稀土元素特征以及原巖恢復、構造環(huán)境判別,得出賽圖拉巖群A組片麻巖以泥砂巖為主,少量含有火成巖的成分,其形成的構造環(huán)境為被動大陸邊緣-活動大陸邊緣-大陸島弧。180交達克鐵多金屬礦賦存于賽圖拉巖群A組片麻巖與提熱艾力組淺變質碎屑巖中,上升的含礦熱液沿斷裂裂隙運移通道與圍巖發(fā)生交代作用,熱液中金的溶解度迅速降低并沉淀成礦。
[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.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P59;P588.345

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