發(fā)布時間：2018-04-15 13:53

  本文選題：Fe-O-S同位素 + 主/微量元素�。� 參考：《地質(zhì)通報》2017年06期

【摘要】：新疆磁海鐵礦位于北山構(gòu)造-成礦帶西端,以磁海礦段為主要組成部分,鐵礦體主要為透鏡狀、似層狀,圍巖以輝綠巖為主,二者接觸線截然且平直;另外一種礦體產(chǎn)在基性巖體與地層接觸帶的石榴子石透輝石矽卡巖巖體內(nèi),整個矽卡巖巖體即為鐵礦體。通過野外礦床特征與礦相學(xué)研究,成礦過程可分為:(1)礦漿期,以磁鐵礦+單斜輝石+普通角閃石的近同時產(chǎn)出為特征;(2)矽卡巖期,先期以石榴子石+透輝石+磁鐵礦為特征,后期以透閃石/陽起石+石英+磁黃鐵礦+黃銅礦+黃鐵礦的組合為特征。通過對礦漿期及矽卡巖期典型礦物的地球化學(xué)及Fe、S、O同位素結(jié)果分析,認(rèn)為礦漿期鐵質(zhì)具有幔源特征,矽卡巖期成礦流體對礦漿期具有繼承性。通過與前人研究結(jié)果對比分析,認(rèn)為磁海成礦可能形成于塔里木地區(qū)二疊紀(jì)地幔柱背景,含礦母巖漿可能為地幔柱的分支。
[Abstract]:The maghai iron deposit in Xinjiang is located at the western end of the Beishan tectonic-metallogenic belt with the maghai ore segment as the main component. The iron ore body is mainly lenticular and bedded, and the surrounding rock is dominated by diabase. The contact lines between them are straight and straight.Another type of orebody occurs in the garnet diopside skarn in the contact zone between the basic rock body and the strata, and the whole skarn body is an iron ore body.Based on the field study of ore deposit characteristics and mineralogy, the metallogenic process can be divided into two stages: 1) magma stage, 2) skarn stage, and 2) skarn stage, and 1) garnet diopside magnetite stage, which is characterized by magnetite monopyroxene common hornblende.The late stage is characterized by the combination of tremolite / actinite quartz pyrrhotite chalcopyrite.Based on the geochemistry of typical minerals in magma period and skarn stage and the analysis of Fe ~ (2 +) S _ (O) isotopic results, it is concluded that the iron in the pulp stage has the characteristics of mantle source, and the ore-forming fluid in skarn stage is inherited to the pulp period.By comparing and analyzing the results of previous studies, it is concluded that the magnetospheric mineralization may have been formed in the Permian mantle plume setting in the Tarim area, and that the ore-bearing parent magma may be a branch of the mantle plume.
【作者單位】： 地質(zhì)過程與礦產(chǎn)資源國家重點實驗室/中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國地質(zhì)科學(xué)院地質(zhì)研究所/國土資源部同位素地質(zhì)重點實驗室;
【基金】：國家自然科學(xué)基金項目《西天山Almalyk和吐拉蘇礦集區(qū)成礦作用對比研究》(批準(zhǔn)號:U1303292)、《沙漠-草原覆蓋區(qū)礦產(chǎn)綜合預(yù)測理論與隱伏礦床含礦信息提取方法》(批準(zhǔn)號:41430320)
【分類號】：P59;P618.31

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