稀有金属花岗岩富集成矿的烃类气体地球化学标志——以广西栗木锡多金属矿为例  

Geochemical marks of hydrocarbon gases for enrichment and mineralization of rare metal granites——A case study on Limu tin—polymetallic deposit,Guangxi

作　　者：李博 徐庆鸿[1,2] 陈远荣 李学彪[3] 黎家财 柒锦捷 LI Bo;XU Qinghong;CHEN Yuanrong;LI Xuebiao;LI Jiacai;QI Jinjie(Guilin University of Technology,Guilin,Guangxi,541004;Guangxi Key Laboratory of Exploration for Hidden Ore Deposits,Guilin,Guangxi,541004;China Nonferrous Metals(Guilin)Geology and Mining Co.,Ltd,Guilin,Guangxi,541004)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541004 [3]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《地质论评》2023年第3期987-1003,共17页Geological Review

基　　金：桂林理工大学博士基金科研项目(编号:2016004);科技类项目(编号:2019QZKK0802-03-4)的成果。

摘　　要：烃类气体在自然界广泛分布并具有复杂成因和来源,同时针对烃类气体的研究不应局限于石油、天然气等传统能源矿产,而需要推广到更多其他科研领域。笔者等采取苦橄岩烃类气体标准化的研究思路,以广西栗木锡多金属矿为中心,重点围绕矿区各阶段花岗岩、矿体及地表土壤开展烃类气体宏观特征和微观规律的研究工作。通过研究和对比,揭示花岗岩及矿石中烃类气体特征和变化规律,查明在成矿作用影响下烃类气体成熟度提高且通过构造裂隙向上运移,并被地表土壤吸附形成异常的事实,明确了深部隐伏矿体与土壤烃类气体异常的成因联系及空间对应关系,建立了判断稀有金属花岗岩富集成矿的烃类气体特征指标和参数,研究表明,将烃类气体特征作为判断稀有金属花岗岩富集成矿地球化学标志的思路正确且方法可行,并将对今后进一步拓展烃类气体的研究和应用领域产生积极影响。Hydrocarbon gas was widely distributed in nature and had complex causes and sources.And the hydrocarbon gas can present the change of macroscopic and microscopic characteristics in different conditions of geological environment.According to that,the research of hydrocarbon gas should not be confined to the traditional energy minerals such as petroleum,natural gas,but need to promote to more other research areas.Based on the standardization of hydrocarbon gases in picrite,centering on the tin polymetallic deposit in Limu,Guangxi,this paper focused on the study of the macroscopic characteristics and microscopic laws of hydrocarbon gases in granite,orebody and surface soil at different periods of the mining area.Through research and comparison,this paper revealed the characteristics and variation rules of hydrocarbon gases in granites and different types of ores at different stages,and found out the fact that the maturity of hydrocarbon gases,which was influenced by mineralization,increased and migrated upward through tectonic fissures and was absorbed by the surface soil,which formed anomalies.The intrinsic genetic relationship and spatial correspondence between deep concealed ore body and soil hydrocarbon gas anomaly were clarified,and the characteristic indexes and parameters of hydrocarbon gas for judging the enrichment and mineralization of rare metal granite were established.The results showed that the research idea and method of taking the characteristics of hydrocarbon gas as the geochemical indicator for judging the enrichment and mineralization of rare metal granite was correct and feasible.And it would have a positive impact on the further development of hydrocarbon gas research and application in the future.

关 键 词：稀有金属 烃类气体 栗木锡矿 花岗岩 地球化学标志 

分 类 号：P618.2[天文地球—矿床学]