Cenozoic alkali basalts in Penglai, Shandong Province were formed by th e upwelli ng mantle materials.The pyroxene and pyrope in the rock are lowgrade gemstones .They are similar to the basanite in Changle, Shandong Province where sapphire o ccurs.Therefore,Penglai could be another target area for gemstones.
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闫积惠.1999.山东蓬莱新生代玄武岩的构造背景及宝石找矿前景[J].地质论评,45(7):560-564,[DOI]. Yan Jihui.1999. Tectonic Setting of Cenozoic Basalts in Penglai, Shandong Province and the Prospects for Gemstones[J]. Geological Review,45(7):560-564.
