流体包裹体爆裂法测温技术可靠性讨论——以江西大吉山钨矿为例
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摘要
爆裂法是一种经济快速的流体包裹体测温技术,由于该技术的影响因素较多且测试精度往往不是很高,历来受到很多学者的质疑。为了讨论爆裂法测温技术的可靠性,在前人研究的基础上,利用冷热台对大吉山钨矿含矿石英脉中的包裹体爆裂温度进行了显微测温,分析了包裹体个体大小对爆裂温度的影响,发现两者之间存在着明显的反相关性;同时,对数据的进一步分析发现爆裂法测温曲线反映的爆裂峰是2期3类包裹体爆裂叠加的结果,但是实验测得的爆裂温度区间与爆裂法测温结果基本上是吻合的,这说明爆裂法测温技术虽然有较多的影响因素,但是在一定程度上是可靠的,尤其是在找矿勘探方面其潜力很大,值得推广应用。
As a prospecting method,acoustic decrepitation technique could provide a rapid and simple mean of identifying the barren and mineralized quartz veins.However,the method has not gained routine acceptance and development because of its semi-quantitative nature and possible difficulties in decrepigram interpretation.In order to discuss the reliability of the decrepitation technique,microthermometry is applied to determine the decrepitation temperature of fluid inclusions in quartz samples collected from Dajishan tungsten deposit in Jiangxi Province.The microthermometry data indicate that the decrepitated temperature is anti-related with the size of fluid inclusions and the decrepitated peak in decrepigram is overlapped by decrepitation of all these three types of fluid inclusions.The results show that the decrepitation technique is reliable in exploration applications and should be used widely.
As a prospecting method,acoustic decrepitation technique could provide a rapid and simple mean of identifying the barren and mineralized quartz veins.However,the method has not gained routine acceptance and development because of its semi-quantitative nature and possible difficulties in decrepigram interpretation.In order to discuss the reliability of the decrepitation technique,microthermometry is applied to determine the decrepitation temperature of fluid inclusions in quartz samples collected from Dajishan tungsten deposit in Jiangxi Province.The microthermometry data indicate that the decrepitated temperature is anti-related with the size of fluid inclusions and the decrepitated peak in decrepigram is overlapped by decrepitation of all these three types of fluid inclusions.The results show that the decrepitation technique is reliable in exploration applications and should be used widely.
引文
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[15]陈毓川,裴荣富,张宏良,等.南岭地区与中生代花岗岩有关的有色及稀有金属矿床地质[M].北京:地质出版社,1999.
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[17]Bodnar R J.Synthetic fluid inclusions-VI.Quantitative evaluationof the decrepitation behaviour of fluid inclusion in quartz at oneatmosphere confining pressure[J].Journal of Metamorphic Geol-ogy,1989,7:229-242.
[18]Bakker R J.Package FLUIDS 1.Computer programs for analysisof fluid inclusion data and for modeling bulk fluid properties[J].Chemical Geology,2003,194:3-23.
[2]卢焕章,范宏瑞,倪培,等.流体包裹体[M].北京:科学出版社,2004.
[3]Shepherd TJ,Rankin A H,Alderton D HM.A Practical Guideto Fluid Inclusion Studies[M].New York:Blackie,1985.
[4]Sami A G Partamies,Matti A J Poutiainen.Application of acous-tic fluid inclusion decrepitometry to gold exploration in Finland[J].Geochemistry:Exploration,Environment,Analysis,2001,1:109-117.
[5]Mavrogenes J A,Bodnar R J.Comparison of decrepitation,mi-crothermometric and compositional characteristics of fluid inclu-sions in barren and auriferous mesothermal quartz veins of CowraCreek Gold District,NewSouth Wales,Australia[J].Journal ofGeochemical Exploration,1995,54:167-175.
[6]Burlinson K.Decrepitation in gold exploration.A case historyfrom the Cotan prospect,N.T.[J].Journal of GeochemicalExploration,1991,42:143-156.
[7]谢奕汉,李秉伦,王金辉,等.高性能爆裂仪在金矿找矿中的应用[J].黄金科技动态:找矿方法,1989(3):15-17.
[8]李昌存,韩秀丽,邹继兴.栾木场金矿石英流体包裹体及成矿预测[J].矿物岩石,1999(1):55-57.
[9]周师立.爆裂法测温中几个问题的探讨[J].江苏地质,1988(1):51-54.
[10]周师立.论矿物解理、裂隙对爆裂法测温的影响和全岩爆裂曲线的意义[J].江苏地质,1988(3):51-55.
[11]张文淮.流体包裹体地质学[M].武汉:中国地质大学出版社,1993.
[12]席斌斌.江西省全南县大吉山钨矿成矿流体地球化学特征及成矿预测[D].北京:中国地质大学(北京),2007.
[13]施娘华.江西省全南县大吉山钨矿床流体包裹体爆裂法初步研究[D].北京:中国地质大学(北京),2007.
[14]卢焕章.华南钨矿成因[M].重庆:重庆出版社,1986.
[15]陈毓川,裴荣富,张宏良,等.南岭地区与中生代花岗岩有关的有色及稀有金属矿床地质[M].北京:地质出版社,1999.
[16]曹钟清.大吉山钽铌钨矿床地质特征及找矿模型[J].地质与勘探,2004,40(6):34-37.
[17]Bodnar R J.Synthetic fluid inclusions-VI.Quantitative evaluationof the decrepitation behaviour of fluid inclusion in quartz at oneatmosphere confining pressure[J].Journal of Metamorphic Geol-ogy,1989,7:229-242.
[18]Bakker R J.Package FLUIDS 1.Computer programs for analysisof fluid inclusion data and for modeling bulk fluid properties[J].Chemical Geology,2003,194:3-23.
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