滇西金厂河矽卡岩矿床C-O同位素地球化学特征  

Carbon and oxygen isotope geochemistry of the Jinchanghe skarn deposit,west Yunnan

作　　者：杨建光 陈伟 杨天云露 Yang Jianguang;Chen Wei;Yang Tianyunlu(Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;West Yunnan University of Applied Sciences,Dali Yunnan 671000,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]滇西应用技术大学,云南大理671000

出　　处：《化工矿物与加工》2021年第2期35-39,共5页Industrial Minerals & Processing

摘　　要：为查明金厂河矿床成矿流体来源和演化,在野外调研的基础上,对不同阶段的方解石开展了C-O同位素研究,结果表明:该矿床热液方解石的δ13CV-PDB为-12.40‰~0.19‰,均值为-5.94‰;δ18OV-SMOW为6.02‰~14.89‰,均值为9.41‰;在方解石δ13CV-PDB-δ18OV-SMOW图解中,投影点主要位于花岗岩源区,显示矿床成矿流体主要来源于深部岩浆热液;晚阶段的δ13CV-PDB和δ18OV-SMOW相对早阶段有所升高,暗示成矿流体在迁移成矿过程中可能受到了碳酸盐岩溶解作用和沉积岩混染或高温效应的影响。综合分析认为,该矿床为陆陆碰撞体制下与深部岩浆作用有关的矽卡岩矿床。In order to investigate the source and evolution of metallogenetic fluid in Jinchanghe skarn deposit, the C-O isotope study on calcite at different stages was carried out upon completion of the field survey. The results shown that the δ13CV-PDB value of hydrothermal calcite in this deposit ranged from-12.40‰ to 0.19‰, averaging-5.94‰ while the δ18OV-SMOW value ranged from 6.02‰ to 14.89‰, averaging 9.41‰. In the δ13CV-PDB-δ18OV-SMOW diagram, the projective points were mostly located in granite zone, which shows the metallogenetic fluid mainly derived from deep magmatic liquid. The value of δ13CV-PDB and δ18OV-SMOW at the late stage was higher than that at the early stage, indicating that the metallogenetic fluid during the migration and mineralization may be affected by the dissolution of carbonatite and the contamination with sedimentary rocks or high temperature. It was believed from the comprehensive analysis that the skarn deposit was subjected to deep magmatism under the continental collision system.

关 键 词：金厂河矽卡岩型矿床 C-O同位素 方解石 成矿流体 成矿作用 高温效应 陆陆碰撞 

分 类 号：P618[天文地球—矿床学] P595[天文地球—地质学]