SIO15: Topic 9 Volcanoes and Plate Boundaries Image: U.S. - PowerPoint PPT Presentation

SIO15: Topic 9 Volcanoes and Plate Boundaries Image: U.S. Geological Survey

SIO15: Topic 9 Volcanoes and Plate Boundaries

SIO15: Topic 9 Volcanoes and Plate Boundaries

SIO15: Topic 9 Volcanoes and Plate Boundaries

geotherm Melting curve P-T P-T cu curve rve of Ea Eart rth T: Temp mpera rature re P: P: Pre Pressu ssure re solid Melting Curve Me rve melt P-T P-T co conditions s when ma mantle ro rock ck me melts to left: ro rock ck so solid to ri right: ro rock ck mo molten Image: S. Marshak “Earth, Portrait of a Planet” SIO15: Topic 9 Volcanoes and Plate Boundaries

geotherm Melting curve solid asce scending ro rock ck me melts upon cro crossi ssing the me melting cu curve rve melt • mi mid-o -oce cean ri ridges • co continental ri rifts • hotsp spots Image: S. Marshak “Earth, Portrait of a Planet” SIO15: Topic 9 Volcanoes and Plate Boundaries

solid vo volatiles s lower r the me melting temp mpera rature re • su subduct ction zo zones melt Image: S. Marshak “Earth, Portrait of a Planet” SIO15: Topic 9 Volcanoes and Plate Boundaries

� Deco comp mpre ressi ssion (mi (mid-o -oce cean ri ridges) s) � Ad Addition of Volatiles s (su (subduct ction zo zones) s) SIO15: Topic 9 Volcanoes and Plate Boundaries