本文選題：東昆侖造山帶　切入點(diǎn)：古特提斯　出處：《中國地質(zhì)大學(xué)(北京)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：東昆侖古特提斯造山帶獨(dú)特的大地構(gòu)造位置、復(fù)雜的構(gòu)造環(huán)境、頻繁的巖漿活動(dòng)及不同程度的變質(zhì)作用,不但清晰地記錄了區(qū)域構(gòu)造-巖漿-成礦作用的造山旋回過程,而且造就了該帶多樣的金屬礦化類型和豐富的礦產(chǎn)資源,成為研究造山過程中金屬超量富集的理想場所,也是揭示殼幔物質(zhì)交換與成礦耦合機(jī)制的窗口。本文通過野外地質(zhì)調(diào)研、同位素定年和地球化學(xué)分析,再造了東昆侖古特提斯造山帶構(gòu)造-巖漿-成礦的演化過程,揭示了重大構(gòu)造事件與大規(guī)模成礦的耦合關(guān)系,構(gòu)建了金成礦的深部動(dòng)力學(xué)機(jī)制,破解了東昆侖古特提斯造山帶金成礦之謎。研究認(rèn)為,東昆侖古特提斯造山帶經(jīng)歷了從板片俯沖(278～240 Ma)到陸-陸碰撞(240～228 Ma)及后碰撞伸展(228～210 Ma)等完整的造山演化過程;相伴發(fā)生了～240 Ma同碰撞期中酸性巖漿活動(dòng)、～228 Ma后碰撞鎂鐵質(zhì)巖漿活動(dòng)等重大構(gòu)造-巖漿事件;與構(gòu)造-巖漿活動(dòng)相對(duì)應(yīng),發(fā)生了 2次大規(guī)模成礦事件(～240 Ma、～228 Ma),形成以大場、五龍溝、坑得弄舍、溝里、托克妥等為代表的一系列重要的礦床。其中,巴顏喀拉的大場金礦床為類卡林型金礦,是后碰撞伸展階段成礦作用的產(chǎn)物;昆南的坑得弄舍金鉛鋅礦床是噴流沉積疊加改造成礦作用的產(chǎn)物;昆中的五龍溝金礦床是多期次成礦疊加的產(chǎn)物,造山型金礦集中于220～237 Ma,金主成礦期與區(qū)內(nèi)的韌性剪切帶和脆性斷裂的活動(dòng)時(shí)代相吻合,矽卡巖型礦化主要發(fā)生在～240Ma;昆中的托克妥斑巖型銅金(鉬)礦床是板塊俯沖階段的典型產(chǎn)物,形成于232 Ma,是板塊俯沖流體交代的產(chǎn)物。昆北的斑巖-矽卡巖型多金屬礦床成礦作用連續(xù),以中-晚三疊世為主�？梢钥闯�,東昆侖古特提斯成礦帶不但具有密集成帶、分布集中,多種類型和多期次疊加成礦的特點(diǎn),而且大規(guī)模成礦事件與造山過程中同碰撞和后碰撞構(gòu)造體制轉(zhuǎn)換期相吻合,而巖漿底侵和殼幔巖漿的混合是造山帶成礦作用的驅(qū)動(dòng)機(jī)制。
[Abstract]:The unique tectonic location, complex tectonic environment, frequent magmatic activity and varying degrees of metamorphism in the Paleottes orogenic belt of East Kunlun not only clearly record the orogenic cycle of regional tectonic-magmatic mineralization, Moreover, it has brought up various types of metal mineralization and abundant mineral resources, and has become an ideal place to study the enrichment of metals in the orogenic process. It is also a window to reveal the coupling mechanism of material exchange and mineralization between crust and mantle. Through field geological investigation, isotopic dating and geochemical analysis, the evolution of tectonic-magma metallogenic process in the PaleoTethys orogenic belt of East Kunlun has been reconstructed. The coupling relationship between major tectonic events and large-scale mineralization is revealed, the deep dynamic mechanism of gold mineralization is constructed, and the mystery of gold mineralization in the ancient Tethys orogenic belt of East Kunlun is solved. The East Kunlun PaleoTethys orogenic belt has undergone a complete orogenic evolution from plate subduction to land- land collision (240 Ma) and post-collision extension (2285210Ma). It was accompanied by two major tectonic-magmatic events, such as tectonic-magmatic events, which occurred after the collision of 228Ma, and 2 large-scale metallogenic events, such as 240 Ma-228MaA, which were formed in a large field, and were associated with tectonic-magmatic activities and other major tectonic-magmatic events. The major tectonic-magmatic events occurred at 228Ma, corresponding to tectonic-magmatic activities. A series of important deposits represented by Wulonggou, Kendronsher, Gouli and Toktor. Among them, the Dachang gold deposit in Bayankala is a kind of Carlin type gold deposit, which is the product of metallogeny in the post-collision extensional stage. The Kunnan kununahe gold, lead-zinc deposit is the product of superposition and reformation of exhalation sedimentation, and the Wulonggou gold deposit in the middle of Kunn is the product of multi-stage ore-forming superposition. The orogenic gold deposits are concentrated at 220 ~ 237 Ma.The gold main metallogenic epoch coincides with the ductile shear zone and the active age of brittle faults in the area. The skarn type mineralization occurred mainly at 240 Ma.The toketoporphyry copper-gold (molybdenum) deposit in Kun is a typical product of plate subduction stage. The ore-forming process of porphyry skarn type polymetallic deposits in the northern part of Kunming is continuous, mainly in the Middle-Late Triassic. It can be seen that the paleoTethys metallogenic belt in East Kunlun not only has a dense metallogenic zone, The characteristics of concentrated distribution, multiple types and multiple periods of superimposed mineralization, and the large scale metallogenic events coincide with the transition period of the same collision and post-collision tectonic regime during orogeny. The mixing of magmatic underplating and crust-mantle magma is the driving mechanism of orogenic belt mineralization.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.51;P542
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本文編號(hào)：1567020