PROPERTY AND METALLOGENIC CHARACTERISTICS OF ALKALI-RICH PORPHYRY IN WESTERN MARGIN OF YANGTZE PLATFORM
来源期刊：中南大学学报(英文版)1998年第2期
论文作者：Hu Xiangzhao
文章页码：57 - 60
Key words：petrology; geochemistry; alkali-rich porphyry; metallogenic characteristics
Abstract: The age of alkali-rich porphyries in the western margin of Yangtze Platform is 30—50 Ma; the minerals mainly are orthoclase, quartz, plagioclase; the chemical composition is alkali-rich [(K2O+Na2O)>8%],high potash[(K2O+Na2O)=5.09%-8.30%]; the content of ∑REE is relatively low, LREE is concentrated, without anomaly of europium; the average initial ratio of 87Sr/86Sr is 0.7073; the value of δ34S similar to that of the meteoritic sulfur; the ratio of Pb isotope corresponds to that of upper mantle; metallogenic types belong to Cu, Mo, Au, Ag, Pb, Zn polymetal mineralization and rare, rare-earth metal mineralization.
