山东省七宝山白垩纪火山机构及矿产

Cretaceous volcanic institutions and mineral resources of the Qibao Mountain, Shandong province

山东省五莲七宝山火山机构具有环形构造特点,其形成与原始地壳的形成发展以及下地壳作用有成因联系或关联。火山机构四周地层出露较简单,除第四系外,主要出露中生代白垩系青山群八亩地组地层,地层产状大部分以围绕火山机构而向四周倾斜。七宝山火山杂岩体呈椭圆状,围岩为青山群火山角砾岩、角砾凝灰岩,杂岩体具多期的岩浆侵入、喷发和后期的热液活动。七宝山火山隐爆角砾岩筒位于七宝山杂岩体内,其中角砾岩呈筒状分布。这些为七宝山金铜矿床的形成提供了有力的条件。

The volcanic institutions of the Qibao Mountain in Wulian County, Shandong Province, have ringed structure characteristics, and their original form has genetic relationships with the formation and development of the Earth＇s crust and the lower crust function. In this area, except for volcanic institutions of the Quaternary system, those of the Cretaceous system exposed simple strata of eight acres, which mainly belonged to the Castle Peak group, and the stratum around the volcanic institutions tilt around. Miscellaneous volcanic rockswere elliptic, and the Castle Peak group of surrounding rockswere auto brecciated, where breccia tuff and noise rocksappeared with periods of the magma intrusion, eruptions, and late hydrothermal activity. The volcanic cryptoexplosive breccia pipe noise in rock masses showed a tubular distribution. Al of these providesuitable conditions for the development of gold and copper mines in the Qibao Mountain.