我国大陆东部斑岩型铜矿床成矿岩体的岩石化学特征及其成矿物质来源探讨

我国东部发育的含矿斑岩体,按其岩石化学特征大致可与环太平洋斑岩铜矿带其它地区的同类岩体相对比,至于可用作判别斑岩体成矿与否的Feiss指数对我国岩体的不适用性,则是由于我国某些斑岩体成矿物质的多来源所致.

PETROCHEMICAL CHARACTERISTICS OF COPPER-PRO DUCTIVE PORPHYRIES IN THE EASTERN PART OF CHINA CONTINENT AND THEIR MATERIAL SOURCES

The porphyry-type copper deposits of eastern China are a part of the Circum-Pacific Porphyry-Type Copper Belt. The productive porphyies of eastern China petrologically and petrochemically are comparable to those in the western Pacifie rim and in the southwestern Pacific island arcs. In another words. they are crystallized products of calc-alkaline-rich magmas, although their alkalities show some difference. The contents of K₂O and SiO₂ of potphyries in eastern China are between those of continental craton in northern American and of the island arcs in the Carlbbean Sea But the Feiss paramenter (Al₂O₃/K₂O+Na₂O+CaOwt%), which is used by Feiss. P.G., and Mason, D.R. for discrimination of productive and non-productive porphyries in other areas of the Circum-Pacific Porphry Copper Belt, are not appropriate to those of eastern China. This inconcinnity for some porphyry systems in eastern China, as we study it, may be result from the poly-sources of metallogenic and petrogenetic materials, which might have come from their wallrocks or the nearly bedded copper orebodies. This coniecture has been proved by the authors through studies in Dexing and Anjishan mines.