%0 Journal Article
%T Fluid inclusion study on the Shisiwan gold deposit in Bainaimiao ore field, Inner Mongolia, China<br>内蒙古白乃庙矿田十四万金矿床流体包裹体研究
%A ZHONG RiChen
%A LI WenBo
%A <br>钟日晨
%A 李文博
%J 岩石学报
%D 2009
%I 
%X The Shisiwan gold deposit is loacted in Xuniwusu gold mineralization belt in Bainaimiao ore field.The quartz veins are controlled by NE-trending faults which are the secondary structure of the EW-trending ductile-shear zone.The ore-forming process can be divided into three stages.The barren quartz veins were formed in early stage and then structurally deformed.The early stage fluid inclusion types are aqueous,carbonic-aqueous and carbonic.The homogenization temperature of early-stage fluid inclusions ranges 260 ～420℃,with average salinity of 6.78% NaCl eqv.The middle stage mineral paragenesis is sulfides+calcite+chlorite+sericite+fine-grained quartz,infilling fissions of early-stage quartz.The middle stage minerals do not show structurally deformation and contain aqueous and carbonic fluid inclusions.The homogenization temperature of middle-stage fluid inclusions ranges 140～260℃,with average salinity of 7.22% NaCl eqv.The late-stage calcite veins contain aqueous fluid inclusions yielding homogenization temperatures of 140～180℃,with average salinity of 2.15% NaC1 eqv.Laser Raman spectra indicates that gases in fluid inclusions are major of CO_2,CH_4and N_2.In general,the ore-forming fluid evolved from carbonic to aqueous,i.e.from CH_4+CO_2+H_2O,through to NaClH_2O+CH_4,and to NaCl-H_2O.Fluid immiscibility occurred in both early and middle stages and resulted in release of CO_2and CH_4.Calcite precipitation in middle stage reduced the activity of CO_2 and thus induced precipitation of sulfides and gold.Therefore,the study in both fluid inclusions and ore geology suggests that the Shisiwan deposit is a gold deposit of orogenic class.The ore-forming fluids are interpreted to have derived form metamorphic devolatilation of the Xuniwusu formation during late Permian-early Triassic collisional orogeny between the Siberia and North China continents.
%K Inner Mongolia
%K Shisiwan gold deposit
%K Fuid inclusion
%K Orogenic gold deposit
%K Continental collision<br>内蒙古
%K 十四万金矿床
%K 流体包裹体
%K 造山型金矿
%K 大陆碰撞
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=86C942049E4E815A209D52D7098F9371&yid=DE12191FBD62783C&vid=C5154311167311FE&iid=708DD6B15D2464E8&sid=A3F88DB974048AA6&eid=5371E3AD73F1A656&journal_id=1000-0569&journal_name=岩石学报&referenced_num=1&reference_num=62