云南腾冲地区火成岩系列和锡多金属矿床成矿系列的初步研究

本文讨论了腾冲地区燕山晚期-喜山期与锡多金属矿床有关的火成岩系列和成矿系列。火成岩系列的多级分异演化导致矿质和有益于成矿的元素聚集于晚阶段岩体的隆起部位。成矿系列表现为以岩隆为核心,空间上有铌、钽、钨、锡→锡、铁→锡的元素分带性,时间上有多阶段的规律性。最后提出了区内锡多金属矿床成矿系列的成矿模型及锡成矿三要素说。

THE IGNEOUS ROCK SERIES AND THE TIN POLYMETALLIC MINEROGENETIC SERIES IN THE TENGCHONG AREA, YUNNAN

In this paper the igneous rock series and the metallogenic series are studied. The igneous rock series consisting of quartz-diorite, granodiorite, monzonitic/alkali-feldspar grainte, diorite and diabase, originated in the lower crust and was emplaced in the upper crust. Two stages of magmatic differentiation reflected in zones from granodiorite to monzonitic/alkali-feldspar granite and from the interior of monzonitic/alkali-feldspar granite to its cupola has led to great enrichment of silica, alklis, volariles, some incompatible elements and metallogenic elements in the cupola of the monzonitic/alkali-feldspar granite. The metallogenic series of the tin polymetallic deposits in the Tengchong area shows a zoning of Nb-Ta-W-Sn, Sn-Fe and Sn around the cupola of the monzonitic/alkali-feldspar granite in space and a regularity of multi-stage in time. Based on the study of tin minerogenesis in the Tengchong area and com parison with the research status in this field over the world, a new idea on tin minerogene-sis has been put forward, which includes three major factors: a primitive tin-rich geochemical field, plate subduction-collision-rifting, and high differentiation of igneous rocks series.