冀东牛心山金矿区岩浆岩特征及其成因探讨

本区岩浆岩以花岗岩为主体,只在岩浆演化晚期有少量中性岩岩墙。岩浆演化及岩石化学、稀土元素、同位素等特征表明,岩浆是燕山运动早期构成下地壳的基性物质经部分重熔形成,熔融早期最低熔融组分形成花岗岩浆,进一步重熔,晚期形成少量中性岩浆。

CHARACTERISTICS OF THE MAGMATIC ROCKS AND THEIR GENESIS IN NIUXINSHAN GOLD MINING DISTRICT EASTERN HEBEI PROVINCE

Granite rocks are mainly exposed in Niuxinshan area, Eastern Hebei province. A less amount intermediate dikes developed at the later stage of the magmatic evolution. The characteristics of magmatic evolution, petrochemistry, REE, isotope indicate that the magmatic rocks resulted from the partial anatexis of basic compositions in lower crust at the time of Yanshanian orogeny. Earlier, a large amount of granites was formed by the mininum melting, and later, a small amount of intermediate magma was formed by progressive anatexis.