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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.
Along the rim of the Pacific Basin are convergent plate boundaries often referred to as the andesite line since orogenic andesite is associated with this boundary. This line is often, but erroneously, confused with the boundaries of either the Pacific plate or the Pacific basin; the andesite line, however, also includes the Juan de Fuca, Cocos ...
The breccias in the Fifes Peak are mostly shades of gray, purple, and red, with angular to subrounded rock fragments cemented by ash. The fragments are a few inches in dimension, rarely a foot long. They are mostly andesite porphyry, pumice, and glass. With fewer rock fragments, the breccias is a buff and tan. Pieces of petrified wood may be ...
Download QR code; Print/export Download as PDF; Printable version; In other projects ... Pages in category "Andesite formations" The following 22 pages are in this ...
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