abstract:The andesite line is the most significant regional geologic distinction in the Pacific Ocean basin. It separates the mafic basaltic volcanic rocks of the Central Pacific Basin from the partially submerged continental areas of more felsic andesitic volcanic rock on its margins.
From the suture linetowards thenorth, an andesiteline along Sharburti Mountainwasthevolcanic island arcdeveloped from middle Ordovicianto middle-lateSilurian.