雷门沟钼矿化花岗斑岩成因浅析

雷门沟钼矿化花岗斑岩体位于河南省嵩县境内,呈一小岩株状侵位于太华群变质岩系中,出露面积约0.77km~2,在其接触带具有爆发角砾岩。岩体同位素年龄为99—104m.y.,属燕山晚期。本文从该岩体产出的地质背景、空间形态、岩石学和岩石化学等特征方面作了阐述,并进一步从岩体产出的大地构造部位、岩石化学、地球化学以及稀土模式等方面与国内外十一个大型钼矿化花岗岩类岩石进行对比,揭示它们之间的共同规律性,论证了本岩体在成因上属于同熔型的花岗岩类。

GENESIS OF THE LEIMENGOU MOLYBDENUM MINERALIZED GRANITE PORPHYRY

Located in Songxian Henan province, the Leimengou Mo-mineralized granite porphyry is a small stock with an exposed area of 0.77 km~2, which emplaced in the metamorphic rocks of Taihua Group. Explosion breccia was developed in its contact zone. The isotopic age of the porphyry stock is 99-104 m.y. belonging to late Yanshanian period. This paper expounds the characteristics of the stock from geology, petrology and petrochemistry. Furthermore, the paper gives a comprehensive comparison of the stock with other 11 granite bodies of industrial Mo-mineralization both in China and abroad, from the aspects of geotectonic setting, geochemistry, petrology, REE distribution patterns, etc. and hence reveals their common regularities. It is concluded that the Leimengou granite porphyry belongs to the syntexis type granitoids.