矿物岩石地球化学通报
礦物巖石地毬化學通報
광물암석지구화학통보
BULLETIN OF MINERALOGY PETROLOGY AND GEOCHEMISTRY
2015年
4期
755-762
,共8页
铅锌矿%物质来源%S%Pb 同位素%相山矿田
鉛鋅礦%物質來源%S%Pb 同位素%相山礦田
연자광%물질래원%S%Pb 동위소%상산광전
Pb-Zn deposit%ore-forming fluid%sulfur and lead isotope%Xiangshan ore field
为查明江西相山矿田内铅锌矿和铀矿床的成矿物质来源，对与铅锌矿、铀矿有关的矿石矿物进行了 S、Pb 同位素研究，结果显示，与铅锌矿有关的金属矿物δ34S 值为1.3‰～4.7‰，同铀矿伴生的黄铁矿δ34S 值为7.9‰～14.9‰；赋矿围岩、基底变质岩、铀矿床黄铁矿和铅锌矿硫化物的206Pb ／204Pb 、207Pb ／204Pb 及208Pb ／204Pb 比值整体上有逐渐降低的趋势，均表现出放射性成因铅的特征，不同岩石或矿石的样品铅同位素组成范围基本一致。结合前人研究，说明铅锌矿和铀矿并非来自同一次成矿事件；铅锌矿的成矿期次具有阶段性，硫源具有均一性，主要以深部硫源为主，在其向上迁移的过程中有少量基底变质岩中的硫加入，按照硫化物共生矿物对计算出铅锌矿的成矿温度：早阶段为424～382℃，晚阶段为331～290℃，属中高温热液矿床；铀矿的硫源具有地层硫特征，主要来自于基底变质沉积岩。铀矿床伴生的黄铁矿铅同位素组成比铅锌矿硫化矿的铅同位素组成更具放射性成因铅，铅锌矿的铅源主要与上地壳基底变质岩有关，铀矿的铅源主要以相山火山-侵入杂岩体为主，但是可能还具有少量幔源铅参与。
為查明江西相山礦田內鉛鋅礦和鈾礦床的成礦物質來源，對與鉛鋅礦、鈾礦有關的礦石礦物進行瞭 S、Pb 同位素研究，結果顯示，與鉛鋅礦有關的金屬礦物δ34S 值為1.3‰～4.7‰，同鈾礦伴生的黃鐵礦δ34S 值為7.9‰～14.9‰；賦礦圍巖、基底變質巖、鈾礦床黃鐵礦和鉛鋅礦硫化物的206Pb ／204Pb 、207Pb ／204Pb 及208Pb ／204Pb 比值整體上有逐漸降低的趨勢，均錶現齣放射性成因鉛的特徵，不同巖石或礦石的樣品鉛同位素組成範圍基本一緻。結閤前人研究，說明鉛鋅礦和鈾礦併非來自同一次成礦事件；鉛鋅礦的成礦期次具有階段性，硫源具有均一性，主要以深部硫源為主，在其嚮上遷移的過程中有少量基底變質巖中的硫加入，按照硫化物共生礦物對計算齣鉛鋅礦的成礦溫度：早階段為424～382℃，晚階段為331～290℃，屬中高溫熱液礦床；鈾礦的硫源具有地層硫特徵，主要來自于基底變質沉積巖。鈾礦床伴生的黃鐵礦鉛同位素組成比鉛鋅礦硫化礦的鉛同位素組成更具放射性成因鉛，鉛鋅礦的鉛源主要與上地殼基底變質巖有關，鈾礦的鉛源主要以相山火山-侵入雜巖體為主，但是可能還具有少量幔源鉛參與。
위사명강서상산광전내연자광화유광상적성광물질래원，대여연자광、유광유관적광석광물진행료 S、Pb 동위소연구，결과현시，여연자광유관적금속광물δ34S 치위1.3‰～4.7‰，동유광반생적황철광δ34S 치위7.9‰～14.9‰；부광위암、기저변질암、유광상황철광화연자광류화물적206Pb ／204Pb 、207Pb ／204Pb 급208Pb ／204Pb 비치정체상유축점강저적추세，균표현출방사성성인연적특정，불동암석혹광석적양품연동위소조성범위기본일치。결합전인연구，설명연자광화유광병비래자동일차성광사건；연자광적성광기차구유계단성，류원구유균일성，주요이심부류원위주，재기향상천이적과정중유소량기저변질암중적류가입，안조류화물공생광물대계산출연자광적성광온도：조계단위424～382℃，만계단위331～290℃，속중고온열액광상；유광적류원구유지층류특정，주요래자우기저변질침적암。유광상반생적황철광연동위소조성비연자광류화광적연동위소조성경구방사성성인연，연자광적연원주요여상지각기저변질암유관，유광적연원주요이상산화산-침입잡암체위주，단시가능환구유소량만원연삼여。
In order to identify the sources of ore-forming materials for lead-zinc ore and uranium ore deposits in the Xiang-shan ore field,Jiangxi province,S and Pb isotopes in lead-zinc ore and uranium ore minerals were measured.The results showed that δ34S of metallic minerals associated with lead-zinc mineral are 1 .3‰-4.7‰,δ34S of pyrites associated with u-ranium mineral are 7.9‰-1 4.9‰;206Pb /204Pb ,207Pb /204Pb and 208Pb /204Pb ratios of host rocks,metamorphic rocks,py-rite of uranium deposit and sulfide of lead-zinc all decrease gradually,showing the characteristics of radiogenic Pb,and all measured Pb isotopic compositions are in the same range.Combined with previous studies,lead-zinc ore and uranium ore were not from the same metallogenic event;lead-zinc ores were formed periodically,the sulfur source was uniform, mainly the deep sulfur source,during the upward migration there was a spot of sulfur of basement metamorphic rocks sneaking,calculating mineralization temperatures of lead-zinc ore according to the sulfide mineral thermometer are 424 to 382℃ in the early stage and are 331 to 290℃ in the late stage,indicating the high temperature hydrothermal deposit;sul-fur source of uranium ore could be characterized by stratum,mainly from the basement metamorphic sedimentary rocks. Pyrite of the uranium deposit contains more radiogenic lead than sulfide of the lead-zinc ore,Pb source of the lead-zinc ore was mainly related to the basement metamorphic rocks,but the uranium was mainly from volcano intrusive complex in Xiangshan,and might have a small amount of mantle derived materials.
