| 沙建泽.滇西维西县铜厂箐铜矿床C-O-H同位素特征及其成因探讨[J].地质与勘探,2021,57(4):910-919 |
| 滇西维西县铜厂箐铜矿床C-O-H同位素特征及其成因探讨 |
| C-O-H isotopic composition and genesis of the Tongchangqing copper deposit in the Lanping Basin, Weixi County, western Yunnan |
| 投稿时间：2020-10-15 修订日期：2021-03-20 |
| DOI：10.12134/j.dzykt.2021.04.015 |
| 中文关键词: C-H-O同位素 流体来源 矿床成因 铜厂箐铜矿床 维西县 滇西 |
| 英文关键词: C-H-O isotopes, fluid source, deposit genesis, Tongchangqing Cu deposit, western Yunnan |
| 基金项目:国家自然科学基金项目（编号：41363001）资助 |
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| 中文摘要: |
| 滇西维西县铜厂箐铜矿床赋存于中侏罗统花开佐组二段粉砂质泥岩、粉砂岩夹泥灰岩中，受断裂构造控制呈脉状产出。本次通过研究与该矿床铜矿化关系密切的石英及方解石C-H-O同位素组成特征，揭示其成矿流体来源，进而探讨该矿床成因。研究发现，该矿床中主成矿阶段与铜矿共生的方解石样品的δ13CV-PDB值变化于-6.93‰～-6.16‰，均值为-6.69‰，δ18OV-SMOW值变化于10.88‰～13.07‰，均值为11.98‰；与铜矿共生的石英样品的δ18OV-SMOW值变化于14.22‰～16.88‰，均值为15.93‰, δDV-SMOW值介于-87.0‰～-61.7‰，均值为-75.99‰，表明成矿流体主要源自岩浆水。结合区域地质背景，认为在喜马拉雅期印度-欧亚大陆碰撞背景下，由于澜沧江深大断裂和雪龙山断裂长期活动，伴有深部岩浆含矿热液沿构造裂隙充填，形成铜厂箐脉状铜矿床。 |
| 英文摘要: |
| The Tongchangqing copper deposit in the Lanping Basin, Weixi County, western Yunnan is a vein-type Cu deposit controlled by faults, which occurs in silty mudstone, siltstone and muddy limestone of the second member of Middle Jurassic Huakaizuo Formation. This work analyzed the isotopic composition of quartz and calcite which are closely related to copper mineralization in this deposit, determined the source of ore-forming fluid and discussed the genesis of the deposit. Analysis data show that the syn-ore calcite has δ13CPDB and δ18OSMOW values of ?6.93‰ to ?6.16‰ (?6.69‰ on average) and 10.88‰ to 13.07‰ (11.98‰ on average), respectively. δDH2O values of the fluid inclusions in the syn-ore quartz range from ?87.0‰ to ?61.7‰ (?75.99‰ on average), and δ18OH2O values of the syn-ore quartz are of 5.25‰ to 7.91‰ (6.96‰ on average). These C-O-H isotopic compositions indicate that the ore-forming fluid originated from magmatic water. Considering the regional geology, this study suggests that the genesis of this deposit is associated with rhw India-Eurasia continental collision during the Himalayan period. In such a tectonic setting, the long-term activity of the Lancangjiang and Xuelongshan faults, accompanied with ore-bearing hydrothermal fluids from deep magma filling structural cracks, resulted in the Tongchangqing vein-type Cu deposit. |
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