摘要
音凹峡花岗岩体位于甘肃省肃北蒙古族自治县内,为一椭圆形岩基侵位于早二叠世地层中,出露面积643km^2.岩体绝对年龄为237.55百万年,属海两晚期.文中探讨了该岩体产出的地质背景及岩相、岩石学、岩石化学和地球化学等方面的特征,论证了其成因类型为岩浆花岗岩,属Ⅰ型,是岩浆弧后褶皱—逆冲断层带中所形成的再生岩浆侵入体.
The Yinaoxia granitic body is found in Subei Mongol AutonomousCounty, Gansu Province. It is an oval batholith intruding into the LowerPermian Series during the late Hercynian Age and with a fission trackage of 237.55Ma. Here, in the paper, we discuss the geological settingand the characteristics of it in terms of petrology, petrofacies,petrochmistry, and geochemistry. It is suggested that the Yinaoxiagranite may be syntexis (Ⅰ) type magmagranite in petrogenesis andwould be an instrusive body of the regenerated granitic magma, formedin the belt of the fold-overthrust in the back of a magmatic arc.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1991年第1期107-117,共11页
Journal of Lanzhou University(Natural Sciences)
关键词
花岗岩
结晶顺序
岩石化学
甘肃
granite
order of crystallization
plate tectonics
petrochemistry
Gansu
