Fluid Inclusion Raman Spectrometry and Geological Implications of the Lala Copper Deposit in Sichuan
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摘要:
本文通过对拉拉铜矿流体包裹体拉曼光谱分析，发现拉拉铜矿流体包裹体类型具有多样性，既有单相纯气相或纯液相、富气相、富液相、含子晶多相包裹体存在，也有流体-熔体包裹体存在。流体包裹体气相成分中，不限于以往发现的以CO2为主的包裹体成分，也有以N2、CH4或者三者混合为主。流体包裹体子矿物中不仅限于卤化物子晶，还发现了方解石及赤铁矿子晶。总之，拉拉铜矿流体包裹体拉曼光谱特征显示拉拉铜矿成矿流体具有多期次、来源复杂的特点。
Abstract:In this paper, through the Raman spectroscopy analysis of fluid inclusions in Lala copper deposit, it is found that the types of fluid inclusions are diverse, including not only single pure gas phase or pure liquid phase, gas-rich phase, liquid-rich phase, and many daughter crystals, but also melt-fluid inclusions. The gas phase components of fluid inclusions are not limited to the CO2, but also include N2, CH4 or a mixture of the three. Not only halide daughter crystals but also calcite and hematite daughter crystals are found in fluid inclusion daughter minerals. In conclusion, the Raman spectroscopy characteristics of fluid inclusions show that the ore-forming fluids of the Lala copper deposit have the characteristics of multiple stages and complex sources.
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Key words:
- Lala copper deposit /
- Fluid inclusion /
- Raman spectroscopy
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表 1 拉拉铜矿流体包裹体测试样品
Table 1. Samples of fluid inclusion from the Lala copper deposit
序号 样品编号 采样地点 包裹体制片部位 岩矿石类型 1 SH028-1 露天采场 石英-方解石脉 块状辉绿岩 2 SH028-2 露天采场 石英脉 顺层石英脉（未见矿化） 3 LL2101 露天采场 石英脉 块状黄铜矿 4 210109-3 1938平台3号矿体 石英-方解石脉 浸染状黄铁矿 5 210109-9 1938平台2号矿体 方解石脉 脉体中发育黄铁矿 6 210109-20 2058平台 石英-方解石脉 镜铁矿 7 DLT-4-1 4号矿体 石英脉 浸染状黄铁矿 8 DLT-4-10 4号矿体 石英脉 含黄铁矿、黄铜矿矿石 9 LL02-4 1938平台2号矿体 石英脉 钠长岩 
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表 2 包裹体主要类型及拉曼成分
Table 2. Main types and Raman components of inclusions
序号 样品编号 主矿物 包裹体类型 拉曼成分 说明 1 SH028-1 石英 气-液两相 H2O-H2O 气液比大致相当，液相比例大于70% 2 SH028-2 石英 液相
气-液两相
气-液-液三相CH4-CO2
CH4-H2O
CH4-CO2-H2O
CH4-CO2-H2O（CH4-CO2组合见气液两相）CH4含量较低，气液比变化大，液相比例10%~ 90% 3 LL2101 石英 液相
气-液两相
气-液-固三相H2O
H2O-H2O
H2O-H2O-子晶 （石盐、方解石、硅酸盐、赤铁矿）气液比变化较小，液相比例80%~ 95% 4 210109-3 石英 气-液两相
气-液-固三相N2-H2O
N2-H2O-子晶（石盐、方解石）气液比变化较小，液相比例80%~ 95% 5 210109-9 萤石 气-液两相
气-液-固三相N2-CH4-H2O
N2-CH4-H2O-石盐子晶气液比变化不大，液相比例95%左右 6 210109-20 石英 气-液两相 N2-H2O 气液比变化较小，液相比例90%~95% 7 DLT-4-1 萤石 液相
气-液两相H2O
CH4-H2OCH4浓度较小，富液相，液相比例90%~95% 石英 气相
气-液-固三相CO2-N2
CH4-H2O
CO2-H2O
N2-CH4-H2O
CO2-H2O-石盐子晶
CO2-N2- H2O-石盐子晶气液比变化大，液相比例10%~ 90%，同相中CO2-N2含量变化较大，CO2含量占60%~95% 8 DLT-4-10 石英 液相
气-液两相
液-固两相
气-液-固三相H2O
H2O-H2O
N2-H2O
H2O-石盐子晶
N2-H2O-子晶（石盐、方解石、硅酸盐、赤铁矿）气液比变化较小，液相比例90%~ 95% 9 LL02-4 石英 气相
气-液两相
气-液-固三相CO2-N2
CO2-N2-H2O
CO2-N2-H2O-子晶（石盐、方解石）CO2-N2相对比例较为一致，CO2含量约占95%
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