本文選題：內(nèi)蒙古 + 巴彥　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：巴彥哈爾金礦床位于華北陸塊與西伯利亞板塊縫合帶南側(cè),屬于二連浩特--錫林浩特金、鐵及銅成礦帶。區(qū)內(nèi)前寒武系和上古生界地層出露廣泛,溫都爾廟地層可能是金成礦物質(zhì)來源之一。受華北古陸塊、古亞洲洋殼和西伯利亞板塊多期次俯沖、碰撞和對接作用影響,區(qū)內(nèi)斷裂構(gòu)造廣泛發(fā)育,巴彥哈爾金礦床與交其爾推覆構(gòu)造及其韌性剪切帶關(guān)系密切。區(qū)內(nèi)侵入巖從加里東期至燕山期巖漿巖均有發(fā)育,且區(qū)內(nèi)礦床多與海西晚期-印支早期的巖漿巖關(guān)系密切。巴彥哈爾金礦床金礦化主要發(fā)育于侵入巖帶旁側(cè)的強糜棱巖化溫都爾廟群云母片巖中,帶內(nèi)發(fā)育低溫?zé)嵋撼傻V作用所形成的含金石英(硅質(zhì))脈。側(cè)礦體主要賦存在石英脈及其兩側(cè)片巖內(nèi),并以后者為主。前人將巴彥哈拉圖序列花崗閃長巖的鋯石U-Pb年齡363Ma作為該礦床的成礦年齡。本次研究結(jié)合礦區(qū)內(nèi)次生暈及稀土元素分析結(jié)果,認(rèn)為礦區(qū)內(nèi)晚期黑云母花崗巖與成礦關(guān)系密切。同時根據(jù)巖體與蛇綠巖體的穿插關(guān)系,以及相似構(gòu)造環(huán)境已知金礦床年齡對比,提出巴彥哈爾金礦床與三疊紀(jì)花崗巖成礦關(guān)系密切,厘定其成礦年齡為226.5±4.1Ma。本文對寶力道石炭世花崗巖和早二疊及晚三疊哈拉圖花崗巖進行了詳細的研究。寶力道花崗巖為鈣堿性準(zhǔn)鋁質(zhì)花崗巖,在Rb-(Yb+Ta)等大地構(gòu)造判別圖解上落于后碰撞區(qū)域,其εNd(t)0,認(rèn)為在寶力道花崗巖的構(gòu)造環(huán)境可能為石炭世向二疊世構(gòu)造轉(zhuǎn)換的后碰撞環(huán)境。哈拉圖花崗巖為強過鋁質(zhì),可在光學(xué)顯微鏡下可觀察到自形原生白云母,且其Ti、P和εNd(t)值較寶力道巖體更低,認(rèn)為其形成于后造山伸展環(huán)境。為該區(qū)域石炭二疊三疊構(gòu)造演化歷史確定,提供了一定參考意義。
[Abstract]:The Bayanhar gold deposit is located on the southern side of the North China continental block and the Siberian plate suture zone, belonging to the Erlianhaot-Xilinhaote gold, iron and copper metallogenic belt. The Precambrian and Upper Paleozoic strata are widely exposed in this area, and the Wenduermiao formation may be one of the sources of gold forming materials. Affected by multiple subduction, collision and docking of the North China paleocontinent block, paleo-Asian oceanic crust and Siberian plate, the fault structures are widely developed in the area. The Bayan Haer gold deposit is closely related to the Jiaoqier nappe structure and its ductile shear zone. The intrusive rocks developed from Caledonian to Yanshanian, and the ore deposits in the area are closely related to the magmatic rocks of late Hercynian and early Indosinian. The gold mineralization of Bayanhar gold deposit is mainly developed in the mica schist of strong mylonitic Wenduermiao group on the side of the intrusive rock belt. The gold bearing quartz (siliceous) vein formed by low temperature hydrothermal mineralization is developed in the belt. The lateral orebodies mainly occur in quartz veins and schist on both sides, and the latter is the main one. The zircon U-Pb age of the granodiorite from the Bayanharatu sequence was used as the metallogenic age of the deposit. Combined with the results of secondary halo and rare earth element analysis, it is concluded that the late biotite granites are closely related to mineralization. At the same time, according to the intercalation relationship between the ore-body and ophiolitic rock mass, and the age comparison of known gold deposits in similar tectonic environments, it is suggested that the Bayan gold deposit is closely related to the Triassic granite mineralization, and its metallogenic age is 226.5 鹵4.1 Ma. In this paper, the Bao Lidao Carboniferous granites and the early Permian and late Triassic Haradu granites have been studied in detail. The Bao Lidao granites are calc-alkaline quasi-aluminous granites, which fall to the post-collision area in the Rb- (YbTa) tectonic discriminant diagram, and 蔚 ND (t) 0. It is considered that the tectonic environment of the Bao Lidao granites may be the post-collision environment of the Carboniferous to Permian tectonic transformation. The Haradu granite is strongly peraluminous and can be observed under optical microscope. The values of Tip and 蔚 ND (t) are lower than those of Bao Lidao, which is considered to be formed in the post-orogenic extensional environment. It provides a reference for determining the evolution history of Carboniferous Permian and Triassic structures in this region.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.51;P588.121

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