中亚造山带东部岩浆热液矿床时空分布特征及其构造背景

发布时间：2018-03-07 15:37

本文选题：岩浆热液矿床　切入点：同位素年龄　出处：《吉林大学学报(地球科学版)》2017年02期 　论文类型：期刊论文

【摘要】：中亚造山带东部是古亚洲洋构造域、鄂霍茨克洋构造域和古太平洋构造域复合叠加区域,矿产资源丰富。本文收集2000—2014年公开发表文献中岩浆热液矿床约1 200个同位素年龄数据,整理出201个较为可靠的年龄数据,通过数字化编图,揭示成矿的时空分布特征及形成背景。结果显示:中亚造山带东部成矿作用始于寒武纪,出现6个重要成矿期:510~473、373~330、320~253、250~210、210~167、155~100 Ma。510~473 Ma(峰值507 Ma),矿床主要分布在大兴安岭—小兴安岭—张广才岭和北山地区,零星发育热液脉型和斑岩型铁铜金钨矿床,与古亚洲洋开始俯冲及微陆块碰撞拼合有关。373~330 Ma(峰值372Ma),矿床主要分布在南蒙古奥尤陶勒盖地区,发育超大型斑岩型铜金矿床,形成于古亚洲洋俯冲环境。320~253 Ma,矿床主要分布在大兴安岭南段,发育少量斑岩型铜矿床和造山型金矿床;其中,298 Ma在大兴安岭南段首次出现以钼为主的斑岩型矿床,指示该区板块俯冲增生向拼贴转变逐渐过渡。250~210 Ma(峰值244 Ma),在蒙古—鄂霍茨克造山带东侧额尔古纳—中蒙古地块主要形成斑岩型铜矿床,可能与蒙古—鄂霍茨克洋俯冲有关;以东地区,主要在大兴安岭南段和辽远地块形成斑岩型钼矿床,在张广才岭发育岩浆熔离型铜镍矿床,反映了古亚洲洋闭合后伸展环境。210~167 Ma(峰值170 Ma),在蒙古—鄂霍茨克造山带西侧乌兰巴托西北部发育造山型-斑岩型金矿床,其东侧额尔古纳地区形成斑岩型铜钼矿床,可能与蒙古—鄂霍茨克洋俯冲碰撞有关;在吉黑东部—张广才岭—小兴安岭—大兴安岭,发育斑岩型钼铜矿床和矽卡岩型铅锌钨金矿床组合,可能属于古太平洋板块向西俯冲成矿体系。155~100 Ma(峰值136 Ma),中亚造山带东部整体处于伸展环境;其中,155~120 Ma在额尔古纳地区主要发育浅成低温热液型银铅锌矿床和造山型金矿床,大兴安岭北段发育斑岩型钼矿床,可能反映了额尔古纳地区和大兴安岭北段受蒙古—鄂霍茨克洋碰撞后伸展环境控制,而在吉黑东部形成浅成低温热液型金矿床,大兴安岭南段发育热液脉型-矽卡岩型锡矿床,可能受古太平洋板块向北俯冲弧后伸展的控制;120~100 Ma沿着华北克拉通和佳蒙陆块边缘发育浅成低温热液型-斑岩型金钼矿床。本研究综合岩浆热液矿床时空分布和矿床类型,进一步揭示了古亚洲洋构造域控制中亚造山带东部古生代成矿作用持续到晚二叠世(到早三叠世),并在晚三叠世叠加古太平洋构造域成矿体系,而额尔古纳—中蒙古地块成矿作用在三叠纪开始主要受蒙古—鄂霍茨克洋构造域限定,并持续到早白垩世早期。
[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.
【作者单位】：中国地质科学院地质研究所;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2013CB429803) 桂林理工大学博士科研启动基金中国地质调查局项目(DD20160102)~~
【分类号】：P611.11

【相似文献】