论主要金属成矿的演化序列

一、前言在地质工作不断发展,地表矿和浅部矿愈来愈少的情况下,为了有效地指导普查找矿工作,成矿规律的研究引起了广大矿床学者的重视。从不同角度,用不同观点,阐明世界的或区域的成矿规律,是当前矿床学发展的主要动向之一。例如,从原子本性和核本能的角度、从成矿系列的角度、从岩浆岩成矿专属性的角度等,以及从板块构造的观

A discussion on the genesis of evolutional series of some main metal-groups

In the study of metallogenesis,many a different point of view hasbeen proposed.The present paper deals only with the problem of the genesis of the evolutional series of some main metal-groups. Based upon thepreliminary studies and analysis of the data as shown in the tables and figures, some conclusions may be drawn as follows. The earth's crust is continuously developed and evolved during varioustectonic movement. This evolutional process has its certain directivityand unreversibility. The directivity lies in the fact that the constituents of the crust have been gradually developed and evolved from basic-ultra-basic to acidic and ultraacidic (alkalic) as the crustcontinuously getlarger and thicker.The main minerogenetic elements has an approximately synchronous evolution with the crust. The evolutional series may be briefly shown assiderophile elements-chalcophile elements-lithophile elements.In point of temporal distribution of mineralizations, the siderophile elements are the main mineralizers that exist in the Precambrian metallogenic cycle; the chalcophile elements are the main mineralizers thatexist in the Caledonian-Yenshanian metallogenic cycle; the lithophile elements are the mineralizers that exist in the Yenshanian-Himalayan metallogenic cycle.As regards spatial distribution of mineralizations, it gives a racliantordinal change from the kern outwards according to the old and new metallogenic cycles in the course of the development of the crust.The evolution is a continuous process and only refers to what has happened since the original crust was formed. The abnormal phenomenaas caused by the basic-ultrabasic intrusions from the mantle due to late crustal rejuvenations are out of the sphere of the evolutional series.The application of evolutional series to the study of the regional metallogenic analysis and also to the promotion of the mineral prognostic work is of great theoretical as well as practical significance.