安徽铜官山铜-铁-金-硫矿床的地球化学特征
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摘要
铜官山铜-铁-金-硫矿床发育上部层状矿体和下部网脉状矿体,地球化学特征呈现出明显的垂向变化和二元结构性。从下部网脉状矿化岩石到上部层状矿石,CaO、MgO、Fe2O3、FeO等含量和δ18O值总体逐渐增高,SiO2、Al2O3、TiO2、K2O、Na2O、REE等含量和流体包裹体温度(341.9℃→178.0℃)及δ34S值总体逐渐降低。黄铁矿δ34S值为(+2.1~+7.9)‰,上部层状块状矿石中方解石和石英δ18O平均值为+13.9‰,下部网脉状矿化岩(矿)石中脉石英或全岩δ18O平均值为+11.7‰。
The geochemical features of the Tongguanshan Cu-Fe-Au-S deposit were presented by a vertical change and a "binary texture", composed of the upper stratiform ore beds and the lower disseminated-veinlet mineralized rocks(ores). The contents of CaO,MgO,Fe2O3 and FeO, and the average value of δ18O increased progressively from the lower disseminated-veinlet mineralized rocks(ores) to the upper stratiform ore beds, accompanied with the contents of SiO2,Al2O3,TiO2,K2O,Na2O and REE, the measured temperatures(from 341.9 ℃ to 178.0 ℃) of fluid inclusions and δ34S values decreasing gradually. The δ34S values of pyrite ranged from +2.1‰ to +7.9‰. The average δ18O value of calcite and quartz in the upper stratiform ore was +13.9‰, and the relevant value of quartz and whole rock in the lower disseminated-veinlet mineralized rocks(ores) being +11.7‰.The geological-geochemical features showed that the Tongguanshan Cu-Fe-Au-S deposit should be of submarine sedimentary exhalative origin.
The geochemical features of the Tongguanshan Cu-Fe-Au-S deposit were presented by a vertical change and a "binary texture", composed of the upper stratiform ore beds and the lower disseminated-veinlet mineralized rocks(ores). The contents of CaO,MgO,Fe2O3 and FeO, and the average value of δ18O increased progressively from the lower disseminated-veinlet mineralized rocks(ores) to the upper stratiform ore beds, accompanied with the contents of SiO2,Al2O3,TiO2,K2O,Na2O and REE, the measured temperatures(from 341.9 ℃ to 178.0 ℃) of fluid inclusions and δ34S values decreasing gradually. The δ34S values of pyrite ranged from +2.1‰ to +7.9‰. The average δ18O value of calcite and quartz in the upper stratiform ore was +13.9‰, and the relevant value of quartz and whole rock in the lower disseminated-veinlet mineralized rocks(ores) being +11.7‰.The geological-geochemical features showed that the Tongguanshan Cu-Fe-Au-S deposit should be of submarine sedimentary exhalative origin.
引文
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Samson I Mand Russell MJ.1987.Genesis of the Silvermines zinc-lead-barite deposit,Ireland:fluid inclusion and stableisotope evidence.Econ.Geol.,82:371—394.
顾连兴,徐克勤.1986.论长江中、下游中石炭世海底块状硫化物矿床.地质学报,60(2):176—188.Gu Lianxing and Xu Keqin.1986.On the Carboniferous submarine massive sulphide deposits in the lower reaches of theChangjiang(Yangzi)River.Acta Geologica Sinica,60(2):176—188.
郭文魁.1957.论安徽铜官山铜矿成因.地质学报,37(3):317—322.Guo Wenkui.1957.On the genesis of the Tongguanshan copper deposit.Acta Geologica Sinica,37(3):317—322.
黄华盛,师其政,崔彬,温春齐.1985.铜官山铜矿床的组合特征及成因.矿床地质,4(2):13—22.Huang Huasheng,Shi Qizheng,Cui Bin and Wen Chunqi.1985.The origin and the geological assemblage feature of the Tongguanshan copper deposit.Mineral Deposits,4(2):13—22.
王文斌,李文达,董平,谢华光.1994.论长江中下游地区含铜黄铁矿型矿床成因.火山地质与成矿,15(2):25—34.Wang Wenbin,Li Wenda,Dong Ping and Xie Huaguang.1994.The genesis of cupriferous pyrite deposit,middle-lower Yan-gtze area,east China.Volcanology&Mineral Resources,15(2):25—34.
温春齐,黄华盛,刘兆廉.1996.铜陵地区石炭系铁铜矿床的矿石组构组份特征.成都理工学院学报,23(2):11—15.Wen Chunqi,Huang Huasheng and Liu Zhaolian.1996.Ore fabric characteristics of copper-iron deposits in Tongling district,Anhui.Chengdu Institute ofTechnology,23(2):11—15.
徐克勤,朱金初.1978.中国南方某些断裂坳陷带中沉积(或火山沉积)铁铜矿床的成因.福建地质,(4):1—68.Xu Keqin and Zhu Jinchu.1978.Origin of the sedimentary-(or volcano sedimentary-)iron-copper deposits in some fault de-pression belts in Southeast China.Fujian Geology,(4):1—68.
杨竹森,侯增谦,蒙义峰,曾普胜,李红阳,徐文艺,田世洪,王训城,姚孝德,姜章平.2004.安徽铜陵矿集区海西期喷流沉积流体系统时空结构.矿床地质,23(3):281—297.Yang Zhusen,Hou Zengqian,Meng Yifeng,Zeng Pusheng,Li Hongyang,Xu Wenyi,Tian Shihong,Wang Xuncheng,YaoXiaode and Jiang Zhangping.2004.Spatial-temporal structures of Hercynian exhalitive-sedimentary fluid system in Tonglingore concentration area,Anhui Province.Mineral Deposits,23(3):281—297.
袁小明.2002.铜官山矿田铜金成矿模式探讨.地球学报,23(6):541—546.Yuan Xiaoming.2002.A tentative discussion on the copper and gold metallogenic model of the Tongguanshan orefield.ActaGeoscientia Sinica,23(6):541—546.
Kase K M.1996.Ore mineralogy and sulfur isotope study of the massive sulfide deposit of Filon Norte,Tharsis Mine,Spain.Mineral Deposita,25(3):11—24.
Pan Y and Dong P.1999.The Lower Changjiang(Yangzi/Yangtze River)metallogenic belt,east central China:intrusion andwall rock hosted Cu-Fe-Au,Mo,Zn,Pb,Ag deposits.Ore Geol.Rev.,15:137—142.
Samson I Mand Russell MJ.1987.Genesis of the Silvermines zinc-lead-barite deposit,Ireland:fluid inclusion and stableisotope evidence.Econ.Geol.,82:371—394.
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