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贵州丹寨卡林型金矿床地球化学特征 被引量:21

GEOCHEMICAL FEATURES OF DANZHAI CARLIN-TYPE GOLD DEPOSIT, GUIZHOU PROVINCE
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摘要 岩石化学及微量元素研究表明 ,从未蚀变层纹状灰岩到强硅化灰岩 ,SiO2 、Au、As和Sb含量逐渐增高 ,CaO、CO2 和MgO含量逐步降低 ;在强碳酸岩化灰岩中 ,CaO和CO2 含量增高 ,SiO2 含量降低 ;各类蚀变与矿化岩石的稀土含量和配分模式与未蚀变层纹状灰岩总体基本一致。流体包裹体资料指示 ,成矿溶液为富Cl- 型 ,爆裂温度为 2 0 0~ 3 3 8℃。同位素研究揭示 ,δ3 4S硫化物 =(1 6 0 78~ 2 0 48)× 1 0 - 3 ,δ18O =(1 9 4~ 2 0 3 )× 1 0 - 3 ,δD =(- 1 1 0~- 47)× 1 0 - 3 ,2 0 6 Pb 2 0 4 Pb =1 8 2 88~ 1 9 2 0 2 ,2 0 7Pb 2 0 4 Pb =1 5 6 85~ 1 5 793 ,2 0 8Pb 2 0 4 Pb =3 8 3 6 6~40 40 1。成矿流体以大气降水为主 ,成矿物质以壳源为主 ,仅有少量幔源组分的参与。 The major and trace element data show that SiO 2, Au, As and Sb contents increase progressively with CaO and MgO contents decreasing gradually from unaltered to the most intensely silicified and mineralized limestones and that SiO 2 contents decrease with CaO and CO 2 increasing in intensely carbonated limestones. The REE contents and chondrite normalized patterns of the altered and mineralized rocks are largely consistent with those of the unaltered host rocks (laminated limestone). The fluid inclusion data indicate that the ore forming fluids are of the Cl - rich type and that filling temperatures of fluid inclusions in the quartz and calcite are about 200~338℃. The isotopic data show that the δ 34 S values ranging from 16.078×10 -3 to 20 48×10 -3 , the δ 18 O and δ D values are (19 4~23 0)×10 -3 and (-110 ~ -47)×10 -3 , respectively, 206 Pb/ 204 Pb, 207 Pb/ 204 Pb and 208 Pb/ 204 Pb falling within the ranges of 18.288~19.202, 15.685~15.793 and 38.366~40.401 respectively. The medium water of ore fluids was dominantly of meteoric origin. The ore forming materials were predominately of crust source with small amounts of mantle component.
出处 《地质科学》 CAS CSCD 北大核心 2002年第1期4-7,共4页 Chinese Journal of Geology(Scientia Geologica Sinica)
基金 中国科学院重大项目 (编号 :KZ 95 1 A1 40 4 0 2 ) 王宽诚教育基金 矿床地球化学开放基金 (编号 :980 41 8)联合资助
关键词 卡林型金矿床 地球化学 丹寨金矿床 成矿流体 成矿物质 流体包裹体 Carlin type gold deposit, Geochemistry, The Danzhai gold deposit
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