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

  更多相關(guān)文章： 西昆侖造山帶 賽圖拉巖群 地球化學(xué) 原巖恢復(fù) 構(gòu)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(jìn)入伊朗、巴基斯坦境內(nèi),也是"中央造山帶"的重要組成部分,具有復(fù)雜的構(gòu)造演化歷史。對(duì)賽圖拉巖群片麻巖的巖相學(xué)、巖石地球化學(xué)等方面研究,依據(jù)礦物組合特征,結(jié)合主量元素、微量元素、稀土元素等恢復(fù)原巖組合和原巖建造,并進(jìn)一步判別其物源性質(zhì)和構(gòu)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(diǎn),微量元素上地殼標(biāo)準(zhǔn)化蛛網(wǎng)圖中表現(xiàn)出現(xiàn)Sr、P、Ti相對(duì)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(diǎn),無(wú)Ce異常,中等偏上的Eu負(fù)異常。運(yùn)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(zhì)砂巖為主,少部分具有火成巖成分。通過(guò)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(fù)、構(gòu)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(gòu)造環(huán)境為被動(dòng)大陸邊緣-活動(dòng)大陸邊緣-大陸島弧。180交達(dá)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(zhì)碎屑巖中,上升的含礦熱液沿?cái)嗔蚜严哆\(yùn)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(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P59;P588.345

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