%0 Journal Article
%T Trace elements,rare earth elements(REE)and Nd-Sr isotopic compositions in scheelites and their implications for the mineralization in Daping gold mine in Yunnan province,China.<br>云南大坪金矿白钨矿微量元素、稀土元素和Sr-Nd同位素组成特征及其意义
%A XIONG DeXin
%A SUN XiaoMing
%A SHI GuiYong
%A WANG ShengWei
%A GAO JianFeng
%A XUE Ting
%A <br>熊德信[
%A ] 孙晓明[
%A ] 石贵勇 王生伟 高剑锋 薛婷
%J 岩石学报
%D 2006
%I 
%X Scheelite is a widely-distributed accessory mineral in auriferous quartz veins in Daping gold deposit,China.Trace elements,rare earth elements(REE)and Nd-Sr isotopic compositions of the scheelite were determined respectively by ICP-MS and mass spectrograph in this work.The results show that the scheelite is enriched with Sr,Ba and depleted with Mo,Bi,Sn,Nb and Ta, indicating that primitive ore-forming fluid of the Daping mine probably didn't derive from magmatic crystallization and differentiation, and was not a mixed fluid of magmatic and meteoric water proposed by many previous researchers.The scheelites picked from different samples possess very similar MREE-enriched and dextral-inclined chondrite-normalied patterns and positive Eu anomaly,suggesting that intensive REE differentiation occurred between the scheelites and the ore-forming fluid,REE were substituted in Ca~(2+) site of the scheelites by charge compensation mechanism(REE~(3+)+Na~+=2Ca~(2+)),and the primitive ore-forming fluid was a relative high temperature,Na~+ enriched and reducing hydrothermal system.High correlation of trace elements and REE compositions in scheelites and diorite around rocks and their alterations suggests that relative intensive fluid-rock interaction occurred before the scheelites precipitation.Sr-Nd isotopic composition of the scheelites indicates the primitive mineralizing fluid derived predominantly from the lower crust,but interfusion of the mantle-derived fluid could not be excluded.The primitive mineralizing fluid had close relationship with the regional ductile deformation in the mining district,the ductile shear zone penetrated the crust,induced CO_2 enriched fluid ascended from the lower crust,and gave birth to intensive fluid-rock interaction with the diorite rock.Formation of the brittle fractures in the shear zone triggered transportation,concentration and boiling of the ore-forming fluid and precipitation of the ore minerals.
%K Scheelite
%K Trace elements
%K REE
%K Nd-Sr isotopic compositions
%K Ore-forming fluid
%K Diorite
%K Daping gold mine<br>白钨矿
%K 微量元素
%K 稀土元素
%K Sr-Nd同位素
%K 成矿流体
%K 闪长岩
%K 大坪金矿
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=CA300ED8B068495F&yid=37904DC365DD7266&vid=BC12EA701C895178&iid=38B194292C032A66&sid=EED44B83FAB71309&eid=6D237E9625601349&journal_id=1000-0569&journal_name=岩石学报&referenced_num=15&reference_num=48