本文選題：硫同位素 + 鉛同位素�。� 參考：《地質(zhì)與勘探》2017年02期

【摘要】：滇中前震旦系主要位于揚子地塊西南緣,元謀-綠汁江斷裂以東、普渡河-滇池斷裂以西,巖漿活動強烈導(dǎo)致該區(qū)地殼結(jié)構(gòu)復(fù)雜,具有"多層結(jié)構(gòu)"的特點。據(jù)統(tǒng)計,賦存在昆陽群中的鉛鋅礦床(點)有近20處,其賦礦地層主要為:大龍口組(Pt_2d)、黑山頭組(Pt_2hst)、鵝頭廠組(Pt_2e)。本文優(yōu)選大笑、熱水塘硫鉛同位素進(jìn)行系統(tǒng)分析對比,總結(jié)指示成礦流體與指示物質(zhì)來源。研究結(jié)果顯示:賦存在前震旦紀(jì)鉛礦礦床~(34)S值變化范圍在6.33‰~14.99‰,成礦流體的總硫同位素值(δ~(34)SΣS)12.17‰。由此可見,賦存在前震旦紀(jì)地層中鉛鋅礦床硫化物主要為混合硫來源,硫同位素的來源具有多源性的特點。東川大笑鉛鋅礦:~(206)Pb/~(204)Pb變化范圍為18.282~18.391,~(207)Pb/~(204)Pb變化范圍為15.491~15.515,208Pb/204Pb變化范圍為38.287~38.326,主要分布于地幔、造山帶演化線。熱水塘鉛鋅礦:~(206)Pb/~(204)Pb變化范圍17.702~18.512,~(207)Pb/~(204)Pb變化范圍15.626~15.72,~(208)Pb/~(204)Pb變化范圍37.504~38.528,主要分布在造山帶演化線附近。μ、ω值的變化范圍表明所分析樣品鉛同位素均屬于異常鉛,說明其成礦物質(zhì)多來源。因此,鉛同位素主要來自地幔、上地殼和造山帶,暗示成礦物質(zhì)來源具有多源型特點。
[Abstract]:The preSinian system in central Yunnan is mainly located in the southwestern margin of Yangtze block, east of Yuanmou-Luzhujiang fault and west of Puduhe-Dianchi fault. Magmatic activity strongly causes the crustal structure in this area to be complicated and has the characteristics of "multi-layer structure". According to statistics, there are nearly 20 Pb-Zn deposits (points) in Kunyang Group. The main ore-bearing strata are: Datong formation (2d), Keshantou formation (PtStup 2hst), Yetouchang formation (Pt2e). In this paper, the sulfur and lead isotopes in hot water pond were systematically analyzed and compared, and the sources of indicating ore-forming fluids and indicating substances were summarized. The results show that the variation range of ~ (34) S value is 6.33 鈥，

本文編號：2112474