山东蓬莱新生代玄武岩的构造背景及宝石找矿前景

Tectonic Setting of Cenozoic Basalts in Penglai,Shandong Province and the Prospects for Gemstones

山东蓬莱位于胶东地体北缘中部。板块动力作用形成了前古生代近EW向构造和中生代NE—NNE向走滑断层,侏罗纪以来地幔柱构造作用逐渐加强,地壳伸展减薄,幔源物质上涌,导致新生代碱性玄武岩喷发。碱性玄武岩中普通辉石、镁铝榴石等可作为低档宝石原料。玄武岩的构造背景、喷发形式、火山机构、岩性特征等与昌乐赋蓝宝石的碧玄岩极为相似,经过有针对性的详细调查研究,寻找红、蓝宝石是有希望的。

Cenozoic alkali basalts in Penglai, Shandong Province were formed by the upwelling mantle materials. The pyroxene and pyrope in the rock are low-grade gemstones. They are similar to the basanite in Changle, Shandong Province where sapphire occurs. Therefore, Penglai could be another target area for gemstones.