Arquivos da tag:ophiolite

PILLOW LAVAS, BLUESCHISTS AND OTHER ANCIENT OCEANIC ROCKS / LAVAS EM ALMOFADA, XISTOS AZUIS E OUTRAS ROCHAS OCEÂNICAS ANTIGAS

Angel Island, San Francisco Bay, is one of the most geologically interesting places, with pilllow basalts, blueschists and serpentinites and wackes. These rocks have been scraped from the subducting plate and represent remnants of a Jurassic oceanic crust, now completely tectonically mixed, in what is called mélange (mixture in French). The Franciscan mélange was formedContinuar lendo “PILLOW LAVAS, BLUESCHISTS AND OTHER ANCIENT OCEANIC ROCKS / LAVAS EM ALMOFADA, XISTOS AZUIS E OUTRAS ROCHAS OCEÂNICAS ANTIGAS”