热液型金矿伴生脉岩系研究及其意义

Study of dyke rock series associated with mesothermal gold deposits and its significance

本文总结了近年来国外有关煌斑岩与热液型金矿化关系研究的最新成果,分析了现状,提出了问题.根据我国辽东、胶东、冀东和秦岭十一个大(中)型金矿伴生脉岩资料,作者论证了把金矿伴生脉岩作为一个整体岩系来研究的重要性和必要性,同时将脉岩系成员划分为“共存型”和“随机型”两类,提出煌斑岩的出现,脉岩系成员基、中、酸、碱种类繁多,并以闪长(玢)岩为主可能是我国华北陆台大型金矿床的重要标志之一.文中罗列了金矿伴生脉岩系系统研究项目,强调了把(含金)石英脉作为一种“脉岩”置于脉岩系几何形态和排列组合系统之中研究的意义,指出大离子亲石元素(LILE)、高场强元素(HFSE)、铂族元素(PGE)以及幔/壳地球化学指纹元素Cr、Ni/Nb、Ta是研究脉岩系形成、演化、含金性和物质来源的重要地球化学工具.

The investigations from eleven large mesothermal gold deposits in eastern Liaoning, Shandong and Hebei province and Qinling area indicate that there are many kinds of dyke rocks, such as diabase, dioritic porphy-rite and granitic porphyrite besides lamprophyres in all of these gold ore-fields. They show a closing spatial, temporal and genetic association with gold mineralization. This paper stresses the necessity and significance to regard all of the dyke rocks associated with gold mineralization in an orefield as an integral rock series for studying and divides them into coexist type and random type. Accumulated data show that the occurrence of lamprophyres, existence of manifold dyke rocks,e. g. basic, mediatic, acidic and alkalic dyke rocks and dioritic porphyrite as dominant part are one of very important marks for some large mesothermal gold deposits compared with other small or mediate deposits in northern China