本文關(guān)鍵詞：熊耳山—外方山礦集區(qū)金—鉬成礦系統(tǒng)　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

  更多相關(guān)文章： Au-Mo礦床 疊加成礦作用 成礦系統(tǒng) 熊耳山-外方山

【摘要】：熊耳山-外方山礦集區(qū)是我國重要的金-鉬等資源產(chǎn)地。前人對(duì)熊耳山-外方山礦集區(qū)各時(shí)期金-鉬礦床進(jìn)行了較多研究,然而對(duì)疊加成礦研究尚少。本文通過巖石地球化學(xué)、穩(wěn)定同位素、流體包裹體、非傳統(tǒng)Fe同位素等分析,解析復(fù)合造山過程和疊加成礦作用,嘗試建立成礦系統(tǒng),獲得如下主要成果。通過LA-ICP-MS鋯石U-Pb分析,厘定熊耳群火山巖噴發(fā)時(shí)限為1828~1746Ma,巖石地球化學(xué)數(shù)據(jù)分析認(rèn)為熊耳群形成于裂谷環(huán)境;限定秦嶺造山帶東秦嶺部分同碰撞和后碰撞轉(zhuǎn)換時(shí)間為227 Ma,秦嶺造山帶同碰撞局部拉張環(huán)境以及后碰撞張性環(huán)境各發(fā)育一期巖漿活動(dòng);五丈山和白土塬巖體分別侵位于160Ma、165 Ma,形成于陸緣弧環(huán)境;太山廟復(fù)式巖體三期侵入時(shí)間分別為125Ma、121Ma、115 Ma形成于華北克拉通大規(guī)模減薄環(huán)境。劃分出6個(gè)成礦期,1875~1855 Ma俯沖環(huán)境斑巖型鉬礦床,1831~1680 Ma裂谷環(huán)境斑巖型鉬礦床,250~227 Ma同碰撞環(huán)境造山型鉬礦床,227~194 Ma后碰撞環(huán)境造山型和碳酸鹽型鉬礦床,163~135 Ma俯沖環(huán)境斑巖型鉬礦床,135~116Ma巖石圈減薄環(huán)境造山型金礦床、巖漿熱液型金礦床和斑巖型鉬礦床。解析了典型礦床如造山型金礦床、造山型鉬礦床、巖漿熱液型金礦床等礦床類型及疊加成礦作用,其中槐樹坪金(鉬)礦床為三疊紀(jì)造山型鉬礦床和白堊紀(jì)造山型金礦床疊加成礦,祁雨溝金礦床為早白堊世早期斑巖型鉬礦床和早白堊世晚期巖漿熱液型金礦床疊加成礦。建立了熊耳山-外方山礦集區(qū)金-鉬成礦系統(tǒng),其重要礦床形成機(jī)制如下:造山型鉬礦床形成于華北、揚(yáng)子板塊同碰撞與后碰撞環(huán)境,分別為俯沖板片變質(zhì)脫水并混合巖漿熱液攜帶殼�；煸淬f成礦,以及變質(zhì)流體萃取地殼中鉬成礦;碳酸巖型鉬礦床形成于華北、揚(yáng)子板塊后碰撞環(huán)境,巖漿熱液攜帶幔源鉬成礦;造山型、巖漿熱液型金礦床形成于巖石圈減薄環(huán)境,分別為變質(zhì)熱液混合少量巖漿熱液萃取殼源金成礦,以及巖漿熱液攜帶幔源金成礦;斑巖型鉬礦床形成于洋陸俯沖、陸內(nèi)裂谷和陸殼減薄環(huán)境,為巖漿熱液攜帶殼�；煸淬f成礦。
[Abstract]:Xiong 'ershan-Waifangshan ore accumulation area is an important source of gold-molybdenum resources in China. Many researches have been carried out on the gold-molybdenum deposits in Xiong 'ershan-Waifangshan ore accumulation area in various periods. However, there are few studies on superimposed metallogeny. Through the analysis of rock geochemistry, stable isotopes, fluid inclusions and unconventional Fe isotopes, the complex orogenic process and superimposed mineralization are analyzed in this paper. Based on LA-ICP-MS zircon U-Pb analysis, the eruption time of volcanic rocks in Xiong'er Group is determined to be 1828 ~ 1746 Ma. According to the petrogeochemical data, the Xiong'er group was formed in the rifting environment. The partial and post-collision transition time of East Qinling orogenic belt is 227 Ma.The local extensional environment and post-collisional tensional environment of Qinling orogenic belt developed magmatic activity in each phase. The Wuzhangshan and Baituyuan intrusions were located at 160 Mai 165 Ma, respectively, and formed in the continental margin arc environment. The third stage intrusion time of the Taishanmiao complex is 125 Ma / 121 Ma ~ (115 Ma) formed in a large scale thinning environment of the North China Craton, and 6 metallogenic periods have been divided. The porphyry molybdenum deposit in 1875 and 1855 Ma subducted environment is of the same collision environment as the porphyry molybdenum deposit of 1831 ~ 1680 Ma rift. The post-collisional orogenic and carbonate molybdenum deposits of 2270.194 Ma subducted porphyry molybdenum deposits at 135Ma. A series of gold deposits, magmatic hydrothermal gold deposits and porphyry molybdenum deposits have been developed. Typical deposits, such as orogenic gold deposits and orogenic molybdenum deposits, have been analyzed in 135U 116Ma lithospheric thinning environment type gold deposit, magmatic hydrothermal type gold deposit and porphyry type molybdenum deposit. The magmatic hydrothermal type gold deposit and its superposition mineralization, among which the Huaishuping gold (molybdenum) deposit is a Triassic orogenic type molybdenum deposit and Cretaceous orogenic type gold deposit superimposed metallogenic. The Qiyugou gold deposit is a porphyry type molybdenum deposit in early Cretaceous and magmatic hydrothermal type gold deposit in late early Cretaceous. The gold-molybdenum metallogenic system in Xiongershan-Waifangshan ore concentration area has been established. Its important deposit formation mechanism is as follows: the orogenic molybdenum deposit was formed in North China, the Yangtze plate collision and post-collision environment, respectively, subduction plate metamorphic dehydration and mixed magmatic hydrothermal fluid carrying crust and mantle mixed molybdenum mineralization. And metamorphic fluid extraction of molybdenum mineralization in the crust; The carbonatite molybdenum deposit was formed in North China, in the post-collision environment of the Yangtze plate, and the magmatic hydrothermal solution carried the mantle source molybdenum mineralization. The orogenic and magmatic hydrothermal gold deposits are formed in the lithospheric thinning environment. They are metamorphic hydrothermal fluids mixed with a small amount of magmatic hydrothermal extraction crust-derived gold deposits and magmatic hydrothermal fluids carrying mantle-derived gold mineralization. Porphyry molybdenum deposits were formed in the subduction of oceanic land, intracontinental rift and continental crust thinning environment, and were formed by magmatic hydrothermal fluids carrying crust-mantle mixed molybdenum 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;P618.65
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本文編號(hào)：1372340