Elashan magmatic belt has complex internal structure and is an important junction in West China and ore concentration area in Qinghai Province. Marine volcanic widely outcrops in Elashan area and the rock types are ainly amygdaloidal basaltic andesite, amygdaloidal andesite, andesitic volcanic breccia, andesitic crystal-vitric tuff debris, andesitic breccia tuff lava, dacite and rhyolite.Marine volcanic rocks occurs by the volcanic strata, or laminated and lenticular shapes in the Suolaqu sandstone, Xingfucun fine-turbidite and Hekashan coarse-turbidite of the Hongshuichuan Formation, which is the product of a marine environment eruption.