本文選題：硫同位素 + 鉛同位素��； 參考：《中國有色金屬學報》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。對其礦石結構特征和成礦物質來源的分析研究有利于區(qū)域成礦規(guī)律的總結。在分析礦床成礦地質條件的基礎上,研究Emba Derho和Debarwa VMS型礦床的礦石結構特征、礦石硫、鉛同位素組成及閃鋅礦中的流體包裹體特征。結果表明:Debarwa和Emba Derho礦床成礦作用在經過VMS過程之后,其后期的變形變質過程對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,數據集中在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。對礦石鉛同位素進行特征參數示蹤、鉛構造模式示蹤和Δβ-Δγ圖解示蹤的結果表明: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】： 北京科技大學土木與資源工程學院;北京科技大學金屬礦山高效開采與安全教育部重點實驗室;中國地質調查局武漢地質調查中心;中國地質大學(北京);
【基金】：中國地質調查局工作項目(1212011220911) 國家自然科學基金資助項目(41372096,41672070)~~
【分類號】：P597;P612

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