新疆萨热克铜矿床地质及C-H-O-S同位素地球化学特征研究
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摘要
在详细总结萨热克铜矿床地质特征的基础上,通过对矿床C-H-O-S同位素的系统研究,探讨其成矿物质和流体来源。矿石的δ34S值分布于-15‰~28.3‰区间,表明硫来自于还原的有机硫。方解石的δ13 CPDB值为-1.8‰~0.6‰,表明成矿流体中碳主要来源于海相碳酸盐岩的溶解,而δD值为-89.6‰~-110.5‰,δ18 O值为6.17‰~7.87‰,指示成矿流体主要来自于盆地建造水。含铜的盆地建造水在运移过程中溶解地层中的海相碳酸盐类岩石,并与还原作用形成的有机硫在合适的层位(砾岩层)结合,可能是导致矿质沉淀的重要机制。
Based on the detailed summary of the geological characteristics,by means of the systematic research on the C-H-O-S isotope,the ore-forming material and fluid sources of Sareke copper deposit is discussed in this paper.Theδ34 S value of ore ranged from-15‰to-28.3‰,which indicated that the S was derived from the reduced organic sulfur,and theδ13 CPDBvalue of calcite ranges from-1.8‰to 0.6‰,indicated that C in the ore-forming fluid was derived from the dissolution of marine carbonate rock.TheδD value andδ18 O value of calcite respectively range from-89.6‰to-110.5‰and from 6.17‰to 7.87‰,indicated that ore-forming fluid was mainly derived from the basin construction water.The copper-bearing basin construction water dissolved the marine carbonate rocks of the strata in the process of migration,and then they combined with the reduced organic sulfur at proper position(conglomerate layer),which might be an important mechanism of precipitation of ore materials.
Based on the detailed summary of the geological characteristics,by means of the systematic research on the C-H-O-S isotope,the ore-forming material and fluid sources of Sareke copper deposit is discussed in this paper.Theδ34 S value of ore ranged from-15‰to-28.3‰,which indicated that the S was derived from the reduced organic sulfur,and theδ13 CPDBvalue of calcite ranges from-1.8‰to 0.6‰,indicated that C in the ore-forming fluid was derived from the dissolution of marine carbonate rock.TheδD value andδ18 O value of calcite respectively range from-89.6‰to-110.5‰and from 6.17‰to 7.87‰,indicated that ore-forming fluid was mainly derived from the basin construction water.The copper-bearing basin construction water dissolved the marine carbonate rocks of the strata in the process of migration,and then they combined with the reduced organic sulfur at proper position(conglomerate layer),which might be an important mechanism of precipitation of ore materials.
引文
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[3]李世恒,刘正桃,黄行凯,等.塔西萨热克铜矿床地质特征及成因分析[J].河南科技,2016,34(9):1001-1006.
[4]高珍权,方维萱,王伟,等.沟系土壤测量在新疆乌恰县萨热克铜矿勘查中的应用效果[J].矿产与地质,2005,19(6):669-673.
[5]梁晓鹰.地球化学勘查在新疆萨热克铜矿的应用效果[J].新疆有色金属,2008,31(2):5-8.
[6]李志丹,薛春纪,辛江,等.乌恰县萨热克铜矿床地质特征及硫、铅同位素地球化学[J].现代地质,2011,25(4):720-729.
[7]胡剑辉,吉蕴生,曾志钢,等.新疆萨热克铜矿床地球化学异常评价研究[J].矿产勘查,2014,5(2):281-292.
[8]乔欣,胡煜昭,江小均,等.新疆乌恰萨热克含铜盆地上侏罗统库孜贡苏组复合型冲积扇沉积相研究[J].地质通报,2016,35(11):1884-1894.
[9]祝新友,王京彬,王玉杰,等.新疆萨热克铜矿:与盆地卤水作用有关的大型矿床[J].矿产勘查,2011,2(1):28-35.
[10]CLAYTON R N,O'NEIL J R,MAYEDA T K.Oxygen isotope exchange between quartz and water[J].Journal of Geophysical Research Atmospheres,1972,77(17):3057-3067.
[11]ZHENG Y F.Oxygen isotope fractionation in carbonate and sulfate minerals[J].Geochemical Journal,1999,33:109-126.
[12]韩吟文,马振东,张宏飞,等.地球化学[M].北京:地质出版社,2003:1-369.
[13]ROLLISON G.Volumetric closed chemical transfer system:US,US5199472[P].1993.
[14]赵孟军,王招明,宋岩,等.塔里木盆地喀什凹陷油气来源及其成藏过程[J].石油勘探与开发,2005,32(2):40-54.
[15]薛春纪,陈毓川,杨建民,等.滇西北兰坪铅锌银铜矿田含烃富CO2成矿流体及其地质意义[J].地质学报,2002,76(2):244-253.
[16]SHEOPARD S M F.Characterization and isotopic variations in natural water[J].Reviews in Mineralogy,1986,16(1):165-183.