鄂东岩浆岩成因类型及成岩演化探讨

本文总结了鄂东同熔型中酸性侵入岩浆岩酌基本特征;探讨了岩浆来源;分析了成岩物理化学条件;提出了岩浆演化的过程和成岩成矿系列。

RESEARCHES ON BENETIC TYPE AND DIAGENETIC EVOLUTION OF MAGMATITES FROM EASTERN HUBEI

The metallic endogenic deposit dominant of copper and iron within eastern Hubei is closely related to the intermediate-acidic intrusive rocks in time and space.These intrusive rocks are products caused by the magmatic intru- sion of multiple pulsation of Yanshan tectonic cycle.By all means,it is indicated that the deposit belongs to the magmatic genesis series of syntectic magma diapire ascends to the lower part of the upper crust,forms magma chamber at lower level,and by assimilating partial sali (silica-alumina) materials further forms an intermediate basic-intermediate acidic mixed magma which is an initial magma that experiences magma chamber at higher level and along the structure ascends to the cover to emplace or to erupt. Because of the difference in natures between the crust and basement,and the variation of emplaced strata,the syntectic magmatite subseries of multiple crust source is formed on the northern side of Yangzi (formerly Yangtze) fracture and mainly bears iron,whereas the less crust source one is formed on the southern side and mainly bears copper.