| 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 |
| |
| 引用本文： | 吕斌,王涛,童英,张磊,杨奇荻,张建军.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[J].吉林大学学报(地球科学版),2017,47(2). |
| |
| 作者姓名： | 吕斌 王涛 童英 张磊 杨奇荻 张建军 |
| |
| 作者单位： | 中国地质科学院地质研究所,北京,100037 |
| |
| 基金项目： | 国家重点基础研究发展计划(“973”计划)项目，桂林理工大学博士科研启动基金，中国地质调查局项目(DD20160102)Supported by the National Key Basic Research Program ("973"Program) of China，PhD Research Initiation Fund of Guilin University of Technology and Geological Survey Projects of China Geological Survey |
| |
| 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。
|
| 关 键 词： | 岩浆热液矿床 同位素年龄 时空分布 中亚造山带东部 |
Spatial & Temporal Distribution and Tectonic Settings of Magmatic-Hydrothermal Ore Deposits in the Eastern Central Asia Orogen Belt |
| |
| L&#; Bin,Wang Tao,Tong Ying,Zhang Lei,Yang Qidi,Zhang Jianjun.Spatial & Temporal Distribution and Tectonic Settings of Magmatic-Hydrothermal Ore Deposits in the Eastern Central Asia Orogen Belt[J].Journal of Jilin Unviersity:Earth Science Edition,2017,47(2). |
| |
| Authors: | L&#; Bin Wang Tao Tong Ying Zhang Lei Yang Qidi Zhang Jianjun |
| |
| Institution: | Lü Bin,Wang Tao,Tong Ying,Zhang Lei,Yang Qidi,Zhang Jianjun |
| |
| Abstract: | The Eastern Central Asian Orogenic Belt (ECAOB) is located in the overlap region among Palo-Asian Ocean tectonic domain,Okhotsk Ocean tectonic domain,and Paleo-Pacific Ocean tectonic domain,and very rich in mineral resources.According to statistics and digital mapping of 201 available isotope ages,out of 1 200 ages,spatial-temporal distribution and tectonic settings of magmatichydrothermal ore deposits in the ECAOB are discussed.It's proposed that the mineralization began at Cambrian,and can be identified six distinct metallogenic stages,i.e.510-473 Ma,373-330 Ma,320-253 Ma,250-210 Ma,210-167 Ma,155-100 Ma.From 510 to 473 Ma (peak age at ca.507 Ma),there developed hydrothermal vein and porphyry Fe/Cu/Au/W ore deposits which are scattered in the Beishan and the Great Xing'an-Lesser Xing'an-Zhangguangcai Ranges,and related to the subduction of Paleo-Asian Ocean and the collision of micro-continents.From the Late Devonian to the Early Carboniferous (373-330),super-large scale porphyry Cu-Au deposits formed in the Oyu Tologi of Southern Mongolia,and related to the subduction of Paleo-Asian Ocean.During the third mineralization stage(320-253 Ma),a small amount of porphyry Cu deposits and orogenic Au deposits developed in the south part of Great Xing'an Ranges.Porphyry Mo poly-metallic deposits formed at 298 Ma firstly appeared in study area,representing an important change of tectonic setting,from the subduction accretion to the collage of plates.During the Triassic (250-210 Ma,peak age at ca.244 Ma),numerous porphyry Mo deposits were distributed in the Liaoyuan terranes and the South part of Great Xing'an Ranges,whereas some magmatic separation Cu-Ni deposits formed in Zhangguangcai Ranges,which proposed that those deposits are controlled by post-orogenic extension setting involving the closure of the Palo-Asia Ocean Triassic porphyry Cu deposits in the Erguna-South Mongolia are related to the subduction of the Okhotsk Ocean.During the period of 210-167 Ma (peak age at ca.170 Ma),orogenicporphyry Au deposits developed in the west to the Mongolia-Okhotsk orogenic belt,while porphyry Cu (Mo) deposits exposed in the Erguna where is located in the east to the Mongolia-Okhotsk orogenic belt.It is likely that those early Jurassic deposits were formed in the tectonic setting of the subduction of the Mongolia-Okhotsk Ocean.Conversely,the mineralization in the eastern part of study area is characterized by porphyry Mo/Cu and skarn Pb-Zn/W/Au ore deposits in the eastern JilinHeilongjiang,the Zhangguangcai,the Lesser Xing'an,and the Great Xing'an Ranges,which indicates the westward subduction of the Paleo-Pacific plate.During the last stage of mineralization (155-100Ma),the mineralization in ECAOB was commonly affected by the extensional tectonic setting.Both epithermal Ag-Pb-Zn and orogenic Au deposits formed in the Erguna massif at 155-120 Ma,while porphyry Mo deposits in this period occurred in the north part of Great Xing'an Ranges.It was considered that most deposits were emplaced under the post-orogenic extensional environment after the collision of the Mongol-Okhotsk Ocean.Whereas synchronous epithermal Au-Mo deposits in the eastern Jilin-Heilongjiang and hydrothermal-skarn Sn deposits in the south part of Great Xing'an Ranges are related to the northward subduction of the Paleo-Pacific plate.Some epithermal and porphyry Au-Mo deposits distributed along the paleo-suture between the North China craton and Jia-Meng massif formed during late Early Cretaceous (120-100 Ma).It can be concluded that the Paleozoic mineralization was controlled by the Palo-Asian Ocean tectonic domain,and continued to the Late Permian (or toEarly Triassic),overlapped by the Paleo-Pacific Ocean metallogenic system in the Late Triassic.While,from the Triassic,the mineralization in the Erguna-South Mongolia massif was controlled by the Okhotsk Ocean tectonic domain,and continued to early period of the Early Cretaceous. |
| |
| Keywords: | magmatic-hydrothermal ore deposits isotopic age spatial and temporal distribution Eastern Central Asian orogenic belt |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
