本文選題：硫同位素 + 鉛同位素��； 參考：《中國(guó)有色金屬學(xué)報(bào)》2017年04期

【摘要】：阿斯馬拉(Asmara)地區(qū)位于非洲東北部的厄立特里亞,是重要的VMS型礦床成礦帶。對(duì)其礦石結(jié)構(gòu)特征和成礦物質(zhì)來(lái)源的分析研究有利于區(qū)域成礦規(guī)律的總結(jié)。在分析礦床成礦地質(zhì)條件的基礎(chǔ)上,研究Emba Derho和Debarwa VMS型礦床的礦石結(jié)構(gòu)特征、礦石硫、鉛同位素組成及閃鋅礦中的流體包裹體特征。結(jié)果表明:Debarwa和Emba Derho礦床成礦作用在經(jīng)過(guò)VMS過(guò)程之后,其后期的變形變質(zhì)過(guò)程對(duì)成礦的改造和疊加作用有限。閃鋅礦中的流體包裹體研究顯示其成礦流體具有低鹽度、中-高溫的特征。Debarwa和Emba Derho礦床中黃鐵礦、閃鋅礦和黃銅礦等原生硫化物礦物的δ~(34)SCDT值變化范圍較窄,數(shù)據(jù)集中在0.01%~0.48%之間,重晶石S同位素為高正值(δ~(34)S=1.66%~1.73%),具有地幔硫和海水硫的混合來(lái)源特征。Debarwa和Emba Derho礦床礦石鉛同位素組成穩(wěn)定,顯示正常鉛的特征。對(duì)礦石鉛同位素進(jìn)行特征參數(shù)示蹤、鉛構(gòu)造模式示蹤和Δβ-Δγ圖解示蹤的結(jié)果表明:Debarwa和Emba Derho礦床中礦石鉛主要為地殼與地�；旌系母_鉛。
[Abstract]:The Asmara area, located in Eritrea in northeast Africa, is an important VMS metallogenic belt. The analysis of ore structure characteristics and ore-forming source is beneficial to the summary of regional metallogenic law. Based on the analysis of ore-forming geological conditions, the ore structure, sulfur and lead isotopic compositions and fluid inclusions in sphalerite of Emba Derho and Debarwa VMS type deposits are studied. The results show that the ore-forming process of the W Debarwa and Emba Derho deposits is limited by the late deformation and metamorphism process after the VMS process. The fluid inclusions in sphalerite show that the ore-forming fluids have low salinity and medium-high temperature. In the Debarwa and Emba Derho deposits, there is a narrow range of changes in the SCDT values of the primary sulphide minerals such as pyrite, sphalerite and chalcopyrite, and the data are concentrated in the range of 0.01 ~ 0.48%. The S isotope of barite is high positive (未 ~ (34) S ~ (1.66) and 1.73 ~ (th). It has the characteristics of mixed source of mantle sulfur and seawater sulfur. Debarwa and Emba Derho deposits have stable lead isotopic composition of ore, indicating the characteristics of normal lead. The results of lead isotopic tracer, lead tectonic model tracing and 螖 尾-螖 緯 diagram show that ore lead in the W Debarwa and Emba Derho deposits is mainly subducted lead from crust and mantle.
【作者單位】： 北京科技大學(xué)土木與資源工程學(xué)院;北京科技大學(xué)金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)調(diào)查局武漢地質(zhì)調(diào)查中心;中國(guó)地質(zhì)大學(xué)(北京);
【基金】：中國(guó)地質(zhì)調(diào)查局工作項(xiàng)目(1212011220911) 國(guó)家自然科學(xué)基金資助項(xiàng)目(41372096,41672070)~~
【分類號(hào)】：P597;P612

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