本文選題：巖漿熱液礦床　切入點(diǎn)：同位素年齡　出處：《吉林大學(xué)學(xué)報(bào)(地球科學(xué)版)》2017年02期 　論文類型：期刊論文

【摘要】：中亞造山帶東部是古亞洲洋構(gòu)造域、鄂霍茨克洋構(gòu)造域和古太平洋構(gòu)造域復(fù)合疊加區(qū)域,礦產(chǎn)資源豐富。本文收集2000—2014年公開發(fā)表文獻(xiàn)中巖漿熱液礦床約1 200個(gè)同位素年齡數(shù)據(jù),整理出201個(gè)較為可靠的年齡數(shù)據(jù),通過數(shù)字化編圖,揭示成礦的時(shí)空分布特征及形成背景。結(jié)果顯示:中亞造山帶東部成礦作用始于寒武紀(jì),出現(xiàn)6個(gè)重要成礦期:510~473、373~330、320~253、250~210、210~167、155~100 Ma。510~473 Ma(峰值507 Ma),礦床主要分布在大興安嶺—小興安嶺—張廣才嶺和北山地區(qū),零星發(fā)育熱液脈型和斑巖型鐵銅金鎢礦床,與古亞洲洋開始俯沖及微陸塊碰撞拼合有關(guān)。373~330 Ma(峰值372Ma),礦床主要分布在南蒙古奧尤陶勒蓋地區(qū),發(fā)育超大型斑巖型銅金礦床,形成于古亞洲洋俯沖環(huán)境。320~253 Ma,礦床主要分布在大興安嶺南段,發(fā)育少量斑巖型銅礦床和造山型金礦床;其中,298 Ma在大興安嶺南段首次出現(xiàn)以鉬為主的斑巖型礦床,指示該區(qū)板塊俯沖增生向拼貼轉(zhuǎn)變逐漸過渡。250~210 Ma(峰值244 Ma),在蒙古—鄂霍茨克造山帶東側(cè)額爾古納—中蒙古地塊主要形成斑巖型銅礦床,可能與蒙古—鄂霍茨克洋俯沖有關(guān);以東地區(qū),主要在大興安嶺南段和遼遠(yuǎn)地塊形成斑巖型鉬礦床,在張廣才嶺發(fā)育巖漿熔離型銅鎳礦床,反映了古亞洲洋閉合后伸展環(huán)境。210~167 Ma(峰值170 Ma),在蒙古—鄂霍茨克造山帶西側(cè)烏蘭巴托西北部發(fā)育造山型-斑巖型金礦床,其東側(cè)額爾古納地區(qū)形成斑巖型銅鉬礦床,可能與蒙古—鄂霍茨克洋俯沖碰撞有關(guān);在吉黑東部—張廣才嶺—小興安嶺—大興安嶺,發(fā)育斑巖型鉬銅礦床和矽卡巖型鉛鋅鎢金礦床組合,可能屬于古太平洋板塊向西俯沖成礦體系。155~100 Ma(峰值136 Ma),中亞造山帶東部整體處于伸展環(huán)境;其中,155~120 Ma在額爾古納地區(qū)主要發(fā)育淺成低溫?zé)嵋盒豌y鉛鋅礦床和造山型金礦床,大興安嶺北段發(fā)育斑巖型鉬礦床,可能反映了額爾古納地區(qū)和大興安嶺北段受蒙古—鄂霍茨克洋碰撞后伸展環(huán)境控制,而在吉黑東部形成淺成低溫?zé)嵋盒徒鸬V床,大興安嶺南段發(fā)育熱液脈型-矽卡巖型錫礦床,可能受古太平洋板塊向北俯沖弧后伸展的控制;120~100 Ma沿著華北克拉通和佳蒙陸塊邊緣發(fā)育淺成低溫?zé)嵋盒?斑巖型金鉬礦床。本研究綜合巖漿熱液礦床時(shí)空分布和礦床類型,進(jìn)一步揭示了古亞洲洋構(gòu)造域控制中亞造山帶東部古生代成礦作用持續(xù)到晚二疊世(到早三疊世),并在晚三疊世疊加古太平洋構(gòu)造域成礦體系,而額爾古納—中蒙古地塊成礦作用在三疊紀(jì)開始主要受蒙古—鄂霍茨克洋構(gòu)造域限定,并持續(xù)到早白堊世早期。
[Abstract]:The eastern part of the Central Asian orogenic belt is a paleo-Asian oceanic tectonic domain, the Okhotsk oceanic tectonic domain and the paleo-Pacific tectonic domain are superimposed, and there are abundant mineral resources. In this paper, 1 200 isotopic age data of magmatic hydrothermal deposits published in the literature from 2000 to 2014 are collected. In this paper, 201 reliable age data are collected, and the temporal and spatial distribution and background of mineralization are revealed by digital mapping. The results show that the metallogenic process in the eastern part of the Central Asian orogenic belt began in the Cambrian. There are six important metallogenic stages: 510473 / 373N ~ (320) / 253N / 250 ~ 21010 / 167/ 155N ~ (100) Ma (peak value 507MaA). The deposits are mainly distributed in the Daxing'anling, Xiaoxing'anling, Zhang Guangcailing and Beishan areas, and the hydrothermal vein type and porphyry type iron copper and gold tungsten deposits have been developed sporadically, and the ore deposits are mainly distributed in the Daxing'anling, Xiaoxing'anling, Zhangguangcailing and Beishan areas. The ore deposit is mainly distributed in the Oyu Tolgoi area of southern Mongolia and developed a very large porphyry copper-gold deposit, which is related to the subduction of the Paleo-Asian Ocean and the assemblage of microcontinental blocks. It was formed in the paleo-Asian ocean subduction environment of .320-253Ma.The deposit is mainly distributed in the southern part of the Daxing'an Mountains, where a small amount of porphyry copper deposits and orogenic gold deposits are developed, in which the porphyry deposits dominated by molybdenum are first found in the southern part of the Daxing'an Mountains at 298Ma. It indicates that the plate subduction to collage transition gradually. 250 ~ 210 Ma (peak value 244 Ma-). The porphyry copper deposit is mainly formed in the eastern Erguna-Middle Mongolia block of the Mongolia-Okhotsk orogenic belt, which may be related to the Mongolia-Okhotsk Ocean subduction. To the east, porphyry molybdenum deposits were formed mainly in the southern section of Daxing'anling and the Liaoyuan block, and magmatic fused copper-nickel deposits were developed in Zhangguangcailing. Reflecting the post-closure extensional environment of the Paleo-Asian Ocean .21010167Ma( with a peak value of 170MaA), the orogenic porphyry type gold deposit developed in the northwest of Ulaanbaatar in the west of the Mongolia-Okhotsk orogenic belt, and the porphyry copper-molybdenum deposit formed in the Erguna area in the east. It may be related to the subduction collision in the Mongolia-Okhotsk Ocean, where the porphyry type molybdenum copper deposit and skarn type lead-zinc-tungsten and gold deposit assemblage are developed in the eastern part of Jihei, Zhangguangciling, Xiaoxinganling and Daxingan Mountains, It may belong to the westward subduction metallogenic system of the paleo-Pacific plate. (the peak value is 136 Ma), and the eastern part of the Central Asian orogenic belt is in an extensional environment, in which the epithermal silver, lead and zinc deposits and orogenic gold deposits are mainly developed in Erguna area. The porphyry molybdenum deposits developed in the northern part of the Daxinganling Mountains may reflect that the Erguna area and the northern part of the Daxinganling Mountains are controlled by the extensional environment after the Mongolia-Okhotsk Ocean collision, while the epithermal hydrothermal gold deposits are formed in the eastern part of Jilin Province. The hydrothermal vein type skarn tin deposit developed in the southern part of the Daxing'anling Mountains, A low-temperature hydrothermal porphyry gold-molybdenum deposit was developed along the margin of the North China Craton and Jiameng block at 120 ~ 100 Ma controlled by the extension of the paleo-Pacific plate subducting back arc. The present study synthesizes the temporal and spatial distribution and deposit types of magmatic hydrothermal deposits. It is further revealed that the Paleozoic mineralization in the eastern part of the Central Asian orogenic belt controlled by the Paleo-Asian oceanic tectonic domain lasted until the late Permian (to the early Triassic), and the metallogenic system of the paleo-Pacific tectonic domain was superimposed in the late Triassic. The mineralization of the Erguna-Middle Mongolia block was mainly limited by the Mongol-Okhotsk oceanic tectonic domain during the Triassic and lasted until the early Cretaceous.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)研究所;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“973”計(jì)劃)項(xiàng)目(2013CB429803) 桂林理工大學(xué)博士科研啟動(dòng)基金 中國地質(zhì)調(diào)查局項(xiàng)目(DD20160102)~~
【分類號】：P611.11

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