粤北梅子窝钨矿区花岗岩体岩浆动力学特征分析  

Analysis of magmatic dynamics of granitic bodies in Meiziwo tungsten ore area,northern Guangdong

作　　者：卞霄 田晗钰 吴限 李社宏[1] 韦龙明[1] BIAN Xiao;TIAN Hanyu;WU Xian;LI Shehong;WEI Longming(College of Earth Sciences,Guilin University of Technology,Guilin 541006,Guangxi,China;Sichuan Zhide Geotechnical Engineering Co.,Ltd.,Chengdu 610000,Sichuan,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541006 [2]四川志德岩土工程有限责任公司,四川成都610000

出　　处：《矿产与地质》2018年第4期695-701,共7页Mineral Resources and Geology

基　　金：国家深部探测计划专项研究课题(SinoProbe-03-01-03);全国危机矿山接替资源勘查专项典型矿床研究课题(20109908-1)资助

摘　　要：基于梅子窝钨矿床地质特征,以构造地质学、流体力学等为主要研究手段,结合前人对梅子窝钨矿隐伏花岗岩侵入体地球化学特征的研究数据,对矿区岩体形成时的温度、岩浆密度、岩浆粘度、岩浆冷凝速度等岩浆动力学参数进行计算分析岩浆动力学特征,得出有利于梅子窝钨矿形成的岩浆动力学性质,包括岩浆粘度的明显异差促使矿化分带;岩浆密度的不明显变化使岩浆侵位过程中不易发生对流,有利于能量聚;岩浆冷却速度缓慢使其有足够的时间满足矿物晶体生长,有利于成矿元素的充分聚集。通过对花岗岩体侵位机制岩浆动力学方面的深入探讨,查明了岩体侵位与钨矿化的关系,总结矿床的成因的流体动力学依据,为矿床成因探讨和矿山可持续开发利用提供了科学依据。Based on the geological characteristics of Muiziwo tungsten deposit, and the previous geochemical data of concealed granite bodies in the Meiziwo ore area, with the main research methods of structural geology and fluid dynamics, the temperature, magmatic density, viscosity, condensation velocity and other parameters, of the granite bodies are calculated and the characteristics of magmatic dynamics is also analyzed. It is inferred that the magmatic dynamic properties are favorable to the formation of Muiziwo tungsten deposit. The obvious difference of magmatic viscosity promotes mineralization zoning. The indistinct change of magma density makes it difficult for the amgmatic convection during magma emplacement, which is favorable to energy accumulation, and the slow cooling rate of magma makes it to have enough time for the growth of mineral crystals, which is helpful to the full accumulation of ore-forming elements. In this paper, the magmatic dynamics of emplacement mechanism of the granite body is discussed, the relationship between the emplacement of the granite body and tungsten mineralization is found out. The hydrodynamic basis of deposit genesis is summarized. It provides a scientific basis for the ore genesis discussion and sustainable development and utilization of the deposit.

关 键 词：梅子窝钨矿 花岗岩体 岩浆动力学 流体力学 侵位机制 粤北 

分 类 号：P618.67[天文地球—矿床学] P588.121[天文地球—地质学]