CAJ | 학술논문

阿尔泰南缘克兰火山-沉积盆地的泥盆纪VMS型矿床经历了石炭纪一二叠纪同造山的区域变质和热液叠加改造作用,同构造石英脉和穿切层状铅锌矿化的脉状铜矿化很发育.矿石中反映压力-重结晶作用的各种结构构造发育,包括碎斑结构、交代结构、斑状变晶结构和碎裂结构,以及塑性流动构造或皱纹构造、压力影等.对铁木尔特、大东沟铅锌(铜)矿床的包裹体研究表明,在矿化构造岩和晚期硫化物石英脉中发育极丰富的碳质(CO_2-(CH_4-N_2)流体.与碳质流体共生的L_(CO_2)-L_(H_2O)型包裹体均一温度为243.1～412.1℃(铁木尔特)和209～430℃(大东沟),碳质流体的捕获压力估计为180～300 MPa.这些特征与区域变质的温压条件相当,与VMS无关.同步辐射X射线荧光(SRXRF)单个包裹体的重金属微量元素初步对比分析表明,造山型萨热阔布金矿的碳质流体中检出有Au、As,而在VMS矿床中没有检出,说明碳质流体在区域变质过程中对A-u成矿有贡献.
아이태남연극란화산-침적분지적니분기VMS형광상경력료석탄기일이첩기동조산적구역변질화열액첩가개조작용,동구조석영맥화천절층상연자광화적맥상동광화흔발육.광석중반영압력-중결정작용적각충결구구조발육,포괄쇄반결구、교대결구、반상변정결구화쇄렬결구,이급소성류동구조혹추문구조、압력영등.대철목이특、대동구연자(동)광상적포과체연구표명,재광화구조암화만기류화물석영맥중발육겁봉부적탄질(CO_2-(CH_4-N_2)류체.여탄질류체공생적L_(CO_2)-L_(H_2O)형포과체균일온도위243.1～412.1℃(철목이특)화209～430℃(대동구),탄질류체적포획압력고계위180～300 MPa.저사특정여구역변질적온압조건상당,여VMS무관.동보복사X사선형광(SRXRF)단개포과체적중금속미량원소초보대비분석표명,조산형살열활포금광적탄질류체중검출유Au、As,이재VMS광상중몰유검출,설명탄질류체재구역변질과정중대A-u성광유공헌.
The Devonian Kelan volcanic-sedimentary basin, extending along the south margin of the Aldtay Mountains, hosts many Pb-Zn-Cu and Au deposits in the Kangbutiebao Formation (D_1k) that consists of add volcanic rocks and volcaniclastic and carbonic sedimen-tary rocks. During Carboniferous and Permian, the Devonian VMS deposits experienced deformation and metamorphism so that sul-fide quartz veins paralleling with or cutting schist occur widely. Of these deposits, the Ti4murte Pb-Zn-(Cu) deposit is the largest one. Carbonic(CO_2-CH_4-N_2)fluid inclusions in late sulfide-quartz veins represent a very different younger event not related to VMS ores. Some L_(CO_2)-L_(H_2O) inclusions associated with carbortic inclusions have th(totla) 243.1 ～412.1℃. The Dadonggou deposit, another typical VMS deposit in the Kelan basin, also occurs in the Kangbutiebao Formation and has the same mineral assemblages as the Tiemurte deposit. Fluid inclusions in the vein quartz of stage Ⅱ are also dominated by secondary carbonic inclusions and CO_2-rich in-clusions. CO_2-rich inclusions (L_(CO_2)-L_(H_2O)) occasionally associated with carbonic inclusions have 216～430℃ of t_(h(total)). The estimated trapping pressures of carbonic inclusions are in the range of 180 ～ 300 MPa, which correspond to a depth of 6.7 ～ 11.1 km according to lithostatic pressttres. This depth was impossible for VMS deposits. SRXRF analysis shows that Au is not detected in carbonic fluid inclusions of the Tiemurte VMS deposit but is high in the orogenic Sarekoubu deposit. It is considered that the Sarekoubu deposit had higher Au content than the Tiemurte deposit in volcanic sedimentation in Early Devonian so that the Sarekoubu deposit had original gold enrichment. In Carboniferous gold deposits related to carbonic fluids were formed during orogeny, whereas no economic gold mineralization was superimposed at the Tiemurte deposit except for carbonic fluid overprints.