黄金
黃金
황금
GOLD JOURNAL
2014年
2期
18-22
,共5页
冯德胜%孙国胜%敖冬%王春光
馮德勝%孫國勝%敖鼕%王春光
풍덕성%손국성%오동%왕춘광
地球化学特征%成矿物质来源%H-O同位素%C-O同位素%奈林沟金矿床%内蒙古
地毬化學特徵%成礦物質來源%H-O同位素%C-O同位素%奈林溝金礦床%內矇古
지구화학특정%성광물질래원%H-O동위소%C-O동위소%내림구금광상%내몽고
geochemical characteristics%ore-forming material source%H-O isotope%C-O isotope%Nailingou gold deposit%Inner Mongolia
为了查明奈林沟金矿床的成矿物质来源及矿床成因,分别对氢、氧同位素和碳、氧同位素进行了测试分析。石英流体包裹体氢、氧同位素研究表明:δ18 O变化范围在-3.6‰~0.2‰,平均值为-1.71‰,石英的δD介于-115‰~-98‰,平均值为-105.9‰,说明成矿流体与岩浆作用关系密切,原始岩浆水是早期成矿流体主要来源,后期则有大量的大气降水混入,是岩浆水与大气降水共同组成的混合水。方解石的碳、氧同位素研究表明:δ13 C平均值为-4.54‰,与地幔δ13 C值-5.5‰相近;δ18 O平均值为7.86‰,与花岗岩δ18 O的变化范围7‰~13‰相符,说明成矿流体与花岗岩质岩浆热液有关。综合分析认为,奈林沟金矿床属于浅成中低温重熔岩浆热液型金矿床。
為瞭查明奈林溝金礦床的成礦物質來源及礦床成因,分彆對氫、氧同位素和碳、氧同位素進行瞭測試分析。石英流體包裹體氫、氧同位素研究錶明:δ18 O變化範圍在-3.6‰~0.2‰,平均值為-1.71‰,石英的δD介于-115‰~-98‰,平均值為-105.9‰,說明成礦流體與巖漿作用關繫密切,原始巖漿水是早期成礦流體主要來源,後期則有大量的大氣降水混入,是巖漿水與大氣降水共同組成的混閤水。方解石的碳、氧同位素研究錶明:δ13 C平均值為-4.54‰,與地幔δ13 C值-5.5‰相近;δ18 O平均值為7.86‰,與花崗巖δ18 O的變化範圍7‰~13‰相符,說明成礦流體與花崗巖質巖漿熱液有關。綜閤分析認為,奈林溝金礦床屬于淺成中低溫重鎔巖漿熱液型金礦床。
위료사명내림구금광상적성광물질래원급광상성인,분별대경、양동위소화탄、양동위소진행료측시분석。석영류체포과체경、양동위소연구표명:δ18 O변화범위재-3.6‰~0.2‰,평균치위-1.71‰,석영적δD개우-115‰~-98‰,평균치위-105.9‰,설명성광류체여암장작용관계밀절,원시암장수시조기성광류체주요래원,후기칙유대량적대기강수혼입,시암장수여대기강수공동조성적혼합수。방해석적탄、양동위소연구표명:δ13 C평균치위-4.54‰,여지만δ13 C치-5.5‰상근;δ18 O평균치위7.86‰,여화강암δ18 O적변화범위7‰~13‰상부,설명성광류체여화강암질암장열액유관。종합분석인위,내림구금광상속우천성중저온중용암장열액형금광상。
In order to find out the source of ore-forming materials and the genesis of Nailingou gold deposit ,the paper respectively investigated and analyzed C-H-O isotopes.The hydrogen and oxygen isotope studies of fluid inclu-sions in quartz shows that δ18 O ranges between -3.6‰ -0.2 ‰,and average is -1.71‰,δD of the quartz chan-ges from -115‰to -98‰with the mean -105.9‰,showing that the ore-forming fluids are closely related to the magmatism.The early sources of ore-forming fluids were primary magmatic water ,and later mixed with a large amount of atmospheric precipitation ,a mixture of magmatic water and meteoric water .The carbon and oxygen isotope analysis of Calcite in Nailingou gold deposit shows that δ13 C average is -4.54 ‰,approaching to the δ13 C -5.5 ‰of man-tle,and δ18 O ( SMOW) is 7.86 ‰,coinciding with the δ18 O range 7 ‰-13 ‰ of the Granite,while different from that of Andesite ,which indicate that the ore-forming fluids were derived from granite body .