青海卡而却卡铜多金属矿床流体包裹体地球化学及成因意义
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中国地质调查局地质调查项目(编号:1212011085528,1212011121089)、国土资源部“百人计划”项目(200809)、中央级公益性科研院所基本科研业务费专项资金项目(编号:K0901)和国家自然科学基金项目(批准号:41172076)的联合资助

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    摘要:

    卡而却卡位于青海省东昆仑西段祁曼塔格地区,通过最近几年找矿成果显示其找矿潜力巨大。此次研究主要从包裹体测温入手,探讨流体包裹体的成因意义。并且通过对包裹体进行拉曼探针分析和氢氧同位素组成研究,说明了流体的化学成分以及流体来源,并在此基础上探讨了卡而却卡斑岩矿化带和矽卡岩矿化带流体之间的关系。对卡而却卡矿区流体包裹体测温结果研究表明,斑岩矿化带和矽卡岩矿化带成矿流体均分为高温、高盐度流体和中低温、低盐度流体两个端元,其中斑岩矿化带绢英岩化阶段是成矿主要阶段,均一温度集中区间为260~400℃,而矽卡岩矿化带矽卡岩期湿矽卡岩阶段均一温度也集中于260~400℃,该时期是成矿物质沉淀的主要阶段。可以看出,二者成矿阶段均一温度吻合。并且各自温度区间均有很好对应。通过对包裹体氢氧同位素组成研究,卡而却卡矿区成矿流体均来源于岩浆水,但斑岩型矿床流体局部存在着与大气降水的混合,显示出明显的“d18O飘移”现象。激光拉曼探针分析结果显示,卡而却卡成矿流体为一套以H2O-CO2-NaCl-CH4为主,含有微弱 H2S和N2的复杂组分体系。 综上所述,卡而却卡斑岩型矿化带和矽卡岩型矿化带二者属于同一成矿系列,即碰撞后伸展导致酸性岩浆活动而形成的斑岩-矽卡岩铜钼铅铁多金属成矿系列。

    Abstract:

    Kaerqueka is located in Qinghai Province,Qimantage area within the western part of East Kunlun Mountains, further ore-prospecting potential is tremendous. This research reveals the temperature of inclusions and discusses the causes of fluid inclusions.And this research indicates the chemical composition and genesis of fluid through the analysis of Raman and the method of hydrogen and oxygen isotopic composition, And on this basis explores the relationship of fluid between the Kaerqueka porphyry mineralized zone and skarn mineralized zone. The results of researching on inclusions suggest that the metallogenetic fluid consists of high-temperature,hypersaline fluids and medium-low temperature,low salinity ones in porphyry mineralized zone and skarn mineralized zone. The stage of sericite alteration is the main metallogenic stage in porphyry mineralized zone,and the homogeneous temperature region is 260~400℃. homogeneous temperature region of wet skarns phase in skarn deposit is 260~400℃, and this period is the main stage of metallogenic materials precipitation.both homogeneous temperature of mineralization stage are matched. And each homogeneous temperature region correspond well. Through the research on the hydrogen and oxygen isotopic composition of the inclusions, the metallogenic fluid of Kaerqueka porphyry mineralized zone and skarn mineralized zone are derived from the magma water.but the fluid of porphyry mineralized zone compounds of atmospheric precipitation with the obvious \"d18O moves\" phenomenon.The esults of Raman probe analysis show that metallogenic fluid of Kaerqueka mining areas is a complicated system which is a mainly set of H2O-CO2-NaCl-CH4 and contains faintly H2S and N2.Kaerqueka porphyry mineralized zone and skarn mineralized zone belong to the same metallogenic series which is porphyry-skarns copper molybdenum lead iron metal metallogenic series were caused by collision and post extensionin in acidic magma activities.

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引用本文

于淼,丰成友,赵一鸣,李大新,肖晔,刘建楠,李泽峰.2014.青海卡而却卡铜多金属矿床流体包裹体地球化学及成因意义[J].地质学报,88(5):903-917.
YU Miao, FENG Chengyou, ZHAO Yiming, LI Daxin, XIAO Ye, LIU Jiannan, LI Zefeng.2014. Fluid Inclusion Geochemistry in the Kaerqueka Copper Polymetallic Deposit, Qinghai Province and Its Genetic Significances[J]. Acta Geologica Sinica,88(5):903-917.

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历史
  • 收稿日期:2011-12-16
  • 最后修改日期:2013-11-29
  • 录用日期:2013-12-12
  • 在线发布日期: 2014-05-13