| 湘西花垣地区铅锌矿床流体包裹体显微测温与特征元素测定 |
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| 引用本文： | 周云,段其发,曹亮,于玉帅,彭三国,甘金木,李堃,黄惠兰,李芳.湘西花垣地区铅锌矿床流体包裹体显微测温与特征元素测定[J].地球科学,2018,43(7):2465-2483. |
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| 作者姓名： | 周云 段其发 曹亮 于玉帅 彭三国 甘金木 李堃 黄惠兰 李芳 |
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| 作者单位： | 中国地质调查局武汉地质调查中心, 湖北武汉 430205 |
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| 基金项目： | 国家自然科学基金项目41503040中国地质调查局项目12120114008001中国地质调查局项目1212011120790中国地质调查局项目DD20160029 |
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| 摘 要： | 花垣铅锌矿床的成矿流体演化特点和铅锌矿物沉淀机制存有分歧，为了总结矿床成因并建立成矿模式，指导该地区铅锌矿的下一步找矿勘探工作.对闪锌矿、主成矿期方解石和萤石中的流体包裹体进行岩相学观察、显微测温、拉曼光谱分析以及同步辐射X射线荧光微探针分析，结果显示花垣地区铅锌矿床成矿流体温度主要为150~220℃，总盐度一般为13%~23% NaCleqv，多> 15% NaCleqv，密度多 > 1 g/cm3，成矿流体为NaCl-CaCl2-MgCl2-H2O卤水体系.成矿流体均一温度具有由北而南降低的趋势.流体液相组分中主要为Ca2+、Mg2+、Na+、Cl-，具有盆地热卤水体系特点.流体包裹体气相中发育CO2、CH4，方解石、萤石中流体包裹体均有成矿元素Pb、Zn的存在.花垣矿集区成矿流体属于低温度、中-高盐度、中-高密度，成分以钠和钙氯化物为主的含矿热水溶液，流体运移方向为由北向南，流体来源于封层水、大气降水和少量变质水.铅锌矿物的沉淀与热化学硫酸盐还原作用有关.闪锌矿、方铅矿等矿石矿物与方解石、萤石等脉石矿物应属同一富含Pb、Zn、Mn、Fe、As、Cr等成矿元素的成矿流体在同一成矿期次相同条件下沉淀的产物.
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| 关 键 词： | 成矿流体 显微测温 特征元素 铅锌矿床 花垣 湘西 矿床学 |
| 收稿时间： | 2018-06-20 |
Microthermometry and Characteristic Elements Determination of the Fluid Inclusions of the Huayuan Lead-Zinc Deposit in Western Hunan |
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| Abstract: | To understand the evolution of ore-forming fluids and the mechanism of lead-zinc mineral deposition in the Huayuan lead-zinc deposit, summarize the genesis of the deposit and establish a metallogenic model to guide the prospecting and exploration of lead-zinc deposits in the region, petrophysical observation, micro-temperature measurement, Raman spectroscopy and synchrotron radiation X-ray fluorescence microprobe analysis were carried out on the fluid inclusions in sphalerite, calcite and fluorite in the main mineralization stage. In this paper The results show that the ore-forming fluid temperature of lead-zinc deposit in the Huayuan area is mainly 150-220℃, and the total salinity is generally 13%-23% NaCleqv (mostly > 15% NaCleqv) Density > 1 g/cm3. The ore fluid is NaCl-CaCl2-MgCl2-H2O brine system. The homogenization temperature of the ore-forming fluid has a tendency to decrease from north to south. The main components of the fluid are Ca2+, Mg2+, Na+, Cl-, and have the characteristics of hot brine system in the basin. CO2 and CH4 are commonly observed as gas phase of fluid inclusions. Pb and Zn contents above determination limits were examined in the fluid inclusions of both calcite and fluorite. The ore-forming fluids in the Huayuan ore field belong to the low-temperature, medium-high salinity, medium-high density hydrothermal solution, the composition is sodium and calcium chloride-based basin brine. The direction of fluid flow is from north to south. the fluid is derived from formation water, atmospheric precipitation and a small amount of metamorphic water. The precipitation of lead-zinc minerals is related to the thermochemical reduction of sulfate. Sphalerite, galena, calcite and fluorite may have precipitated from the same ore-forming fluid rich in Pb, Zn, Mn, Fe, As, Cr, in the same ore-forming period and under the same conditions. |
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