收藏本站
《中国科学院地质与地球物理研究所2002学术论文摘要汇编》2002年
收藏 | 手机打开
二维码
手机客户端打开本文

Isotopic Geochronology of the Late Paleozoic Kanggur Gold Deposit of East Tianshan Mountain,Xinjiang,NW China

【摘要】:正The Kanggur gold deposit lies in East Tianshan mountains,eastern section of Central Asia orogenic belt.The gold mineralization occurs on the northern margin of the Aqishan-Yamansu Paleozoic island arc in the Tarim Plate.It was hosted mainly in Middle-Lower Carboniferous calc-alkaline volcanic rocks,and controlled by the distributions of syn-tectonic intrusions and ductile shear zones.In order to determine ore-forming age of the Kanggur deposit,samples were collected from ores,wall rocks,altered rocks and intrusions.The dating methods include Rb-Sr isochron, Sm-Nd isochron,and secondly ~(40)Ar/~(39)Ar age spectrum,U-Pb and Pb-Pb methods.Based on the mineral assemblage and crosscutting relationship of ore veins,five mineralization stages are identified.This result is confirmed by isotope geochronologic data.The first stage featuring formation of pyrite-bearing phyllic rock,is mineralogicaliy represented by pyrite,sericite,quartz with poor native gold.The Rb-Sr isochron age of this stage is 290±5Ma.The second stage represents the main forming stage and characterized by native gold-quartz-pyrite-magnetite-chlorite assemblage.Magnetite and pyrite of this stage are dated by Sm-Nd isochron at 290.4±7.2Ma and fluid inclusion in quartz is dated by Rb-Sr isochron at 282.3±5 Ma.The third mineralization stage features native gold-quartz-pyrite vein.In the fourth stage,Au-bearing polymetallic sulfide-quartz veins formed.Fluid inclusions in quartz is dated by Rb-Sr isochron method at 258±21 Ma.The fifth stage is composed of sulfide-free quartz-carbonate veins with Rb-Sr age of 254±7Ma.The first and second stages are related to ductile-brittle deformation of shear zones,and are named dynamo-metamorphic hydrothermal period.The third to fifth stages related to intrusive processes of tonalite and brittle fracturing of the shear zones,are called magmato-hydrothermal mineralization period.The Rb-Sr isochron age of 290±5Ma of the altered andesite in Kanggur mine area may reflect timing of regional ductile shear zone.The Rb-Sr isochron age of 282±16Ma of the quartz-syenite porphyry and the zircon U-Pb age of 275±7Ma of tonalite in north of Kanggur gold mine area are consistent with the age of gold mineralization(290~254Ma).This correspondence indicates that the tonalite and subvolcanic rocks may have been related to gold mineralization.The Rb-Sr,Sm-Nd and U-Pb ages and regional geology support the hypothesis that the Kanggur gold deposit was formed during collisional orogenesis process in Late Variscan.
【分类号】:P618.51

手机知网App
【相似文献】
中国重要会议论文全文数据库 前10条
1 ;Isotopic Geochronology of the Late Paleozoic Kanggur Gold Deposit of East Tianshan Mountain,Xinjiang,NW China[A];中国科学院地质与地球物理研究所2002学术论文摘要汇编[C];2002年
2 ;Major types,characteristics and geodynamic mechanism of Upper Paleozoic copper deposits in northern Xinjiang,northwestern China[A];中国科学院地质与地球物理研究所2006年论文摘要集[C];2007年
3 Jacques Charvet;Michel Faure;Boris Natal'in;Alfred Kroner;Brian Windley;Richard Glen;Reimar Seltmann;Simon Wilde;Flavien Choulet;Cameron Quinn;Yamirka Rojas-Agramonte;;Understanding and Study Perspectives on Tectonic Evolution and Crustal Structure of the Paleozoic Chinese Tianshan:Report on the International Excursion and Workshop,Urumqi,China[A];中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(上)[C];2011年
4 ;Devonian Sedimentary Environments and Provenance of the Qinling Orogen:Constraints on Late Paleozoic Southward Accretionary Tectonics of the North China Craton[A];中国科学院地质与地球物理研究所2006年论文摘要集[C];2007年
5 张晓晖;李铁胜;张福勤;;Comprehensive constraintson the tectono-sedimentary setting of Late Paleozoic turbidites of the Kamuste area,eastern Junggar,Xinjiang[A];中国科学院地质与地球物理研究所2001学术论文汇编(第四卷)[C];2001年
6 ;Paleozoic Epithermal Au and Porphyry Cu Deposits in North Xinjiang,China:Epochs,Features,Tectonic Linkage and Exploration Signi ficance[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第五卷(矿产资源与水资源)[C];2003年
7 SIMON A.WILDE;;Zircon U-Pb ages and tectonic implications of‘Early Paleozoic' granitoids at Yanbian,Jilin Province,northeast China[A];中国科学院地质与地球物理研究所二○○四学术论文汇编·第三卷(油气·矿产·水资源)[C];2004年
8 Stephen G.Franks;Per Aagaard;;Origin and migration of brines from Paleozoic strata in Central Tarim,China:constraints from ~(87)Sr/~(86)Sr,δD,δ~(18)O and water chemistry[A];中国科学院地质与地球物理研究所2001学术论文汇编(第四卷)[C];2001年
9 ;Paleozoic tectonic evolution of the northern Xiajiang,China:Geochemical and geochronological constraints from the ophiolites[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第一卷(地球动力学)[C];2003年
10 Steven L.Goldstein;;Evolution of subcontinental lithospheric mantle beneath eastern China:Re-Os isotopic evidence from mantle xenoliths in Paleozoic kimberlites and Mesozoic basalts[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
中国博士学位论文全文数据库 前1条
1 童思友;[D];中国海洋大学;2010年
中国硕士学位论文全文数据库 前1条
1 谢志鹏;东北地区上古生界热力学特征研究[D];吉林大学;2010年
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62791813
  • 010-62985026