广西大福楼锡多金属矿床成矿流体特征

成永生^{1, 2}，胡瑞忠²

(1. 中南大学 地球科学与信息物理学院，
有色金属成矿预测教育部重点实验室，湖南 长沙，410083；
2. 中国科学院地球化学研究所 矿床地球化学国家重点实验室，贵州 贵阳，550002)

摘 要：通过流体包裹体岩相学和显微测温学等分析，研究大福楼矿床成矿流体的性质及其演化。研究结果表明：大福楼锡矿共发育6种类型的流体包裹体，即Ⅰ型(单相气相包裹体)、Ⅱ型(单相盐水溶液包裹体)、Ⅲ型(两相富蒸汽包裹体)、Ⅳ型(两相富液体包裹体)、Ⅴ型(含CO₂相包裹体)以及Ⅵ型(含NaCl子矿物包裹体)。流体包裹体的均一温度为120~430 ℃，主要的成矿温度为120~145 ℃和380~430 ℃。流体包裹体盐度变化不大，介于17.00%~22.00%之间，属于高盐度流体，具有岩浆热液的标志；流体密度为0.158~1.105 g/cm³，压力为12.0~65.0 MPa，属于中高压力的成矿流体。大福楼锡多金属矿床的成矿流体与大厂矿田其他矿床具有很好的一致性，表明其可能相似的来源与演化。

关键词：大福楼；锡多金属矿床；成矿流体；包裹体；广西

Characteristics of ore-forming fluids in Dafulou tin-polymetallic ore deposit, Guangxi, China

CHENG Yong-sheng^{1, 2}, HU Rui-zhong²

(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry,
Chinese Academy of Sciences, Guiyang 550002, China)

Abstract:Based on the study of the fluid inclusion and microthermometry, the characteristics and evolution of the ore-forming fluid of the Dafulou tin-polymetallic deposit were studied. The results show that there are six types of fluid inclusion: Ⅰ, single-phase gas inclusions; Ⅱ, single-phase brine inclusions; Ⅲ, two-phase vapor-rich inclusions; Ⅳ, two-phase liquid-rich inclusions; Ⅴ, carbon dioxide-bearing inclusions; Ⅵ, containing NaCl daughter minerals inclusions. The homogenization temperature ranges from 120 to 430 ℃, but the main temperature scope ranges from 120 to 145 ℃ and 380 ℃ to 430 ℃. The salinity ranges from 17.00% to 22.00%, characterized by the high salinity and magmatic-hydrothermal fluid. And, the fluid, whose density ranges from 0.158 to 1.105 g/cm³ formed under the medium-high pressure of 12.0-65.0 MPa. The characteristics of the ore-forming fluid for the Dafulou tin-polymetallic deposit accords with the other ore deposits in the Dachang ore field, which may suggest the same source and evolution.

Key words:Dafulou; tin-polymetallic ore deposit; ore-forming fluid; fluid inclusion; Guangxi