This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Lecture 6 08/02/2008 09:21:00 How do rocks meet Composition of Silica: o 70% - Granite, 60% - Andesite, 50% - Basalt, 40% Peridotite o ---------- Framework Temperature: o As depth increases so does the temperature of rocks, Geothermal Gradient. 0-1300C @ 0-100km, 1500-2000C@ 100-300km o ~30*C / Km o Temperature vs. Depth. Curve line = Temp, straight = Melting Curve of basalt. o 0 500 1000 1500 2000 100 Depth 200km 300km 400km Minerals Crystallize at different temperatures. Partial melting occurs when there are different minerals in a rock and some melt faster than others. Volatile content: Water. Volatiles are elements or compounds in a gaseous form. In hot rock, volatiles help break bonds at crystal surfaces. Volatiles make melting faster by ~500 degrees C...
View Full Document
This note was uploaded on 02/08/2011 for the course ECONOMICS 101 taught by Professor June during the Spring '08 term at Rutgers.
- Spring '08