摘要
Ａｌｋａｌｉ－ｒｉｃｈｐｏｒｐｈｙｒｉｅｓｏｆｔｈｅｗｅｓｔｅｒｎｍａｒｇｉｎｏｆＹａｎｇｔｚｅＰｌａｔｆｏｒｍｓｐｒｅａｄａｌｏｎｇＡｉｌａｏｓｈａｎ－Ｊｉｎ－ｓｈａｊｉａｎｇｆｒｏｍｗｅｓｔｔｏｎｏｒｔｈ；ｔｈｅｉｒａｇｅ，ｔｈｅｒｏｃｋｔｙｐｅ...
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 [(K 2O+Na 2O)>8%],high potash[(K 2O+Na 2O)=5.09%-8.30%]; the content of REE is relatively low, LREE is concentrated, without anomaly of europium; the average initial ratio of 87 Sr/ 86 Sr is 0.7073; the value of δ 34 S 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.
