铜陵凤凰山岩体成岩机制探讨

THE ANALYSIS ON THE ROCK-FORMING MECHANISM OF FENGHUANGSHAN ROCKBODY IN TONGLING AREA

凤凰山岩体是铜陵地区规模最大的成矿岩体,在分析其成岩期次、岩浆来源、构造环境及成岩过程的基础上,结合区域控岩构造和地壳细圈层划分的成果,探讨了其成岩机制,指出凤凰山岩体起源于深部的碱性玄武岩浆,在成岩过程中受到了硅质围岩和钙质围岩两次不同程度的同化混染,成岩属典型的AFC混合机制。

Fenghuangshan rockbody is the biggest ore-forming rockbody in the Tongling area. On the basis of the analysis on the rock-forming order, magmatic source, tectonic setting and rock-forming process, combined with achievements of regional rock-control structures and division of crust sublayer, the paper has given a simple analysis on the rock-forming mechanism and pointed out Fenghuangshan rockbody was originated from the deep-seated alkali basalt magma. The rock-forming process has undertaken two different degrees of assimilation and contamination. The rock-forming model belongs to the typical AFC mechanism like assimilation and fractional crystallization.