105-16 9-30 Absolute rock dating, metamorphic rx

G a a examples quartz to quartzite sio2 calcite to

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: s, e.g. A ——> A • (examples: quartz to quartzite [SiO2], calcite to marble [CaCO3]) • Recrystallization of rocks in which new minerals are formed from old, e.g. A + B + C — —> D + E, or ——> F + C Quartz sand grains in sandstone Recrystallized quartz grains in metamorphic quartzite Types of Recrystallization • Recrystallization of rocks without the formation of new minerals, e.g. A ——> A (examples: quartzite [SiO2], marble [CaCO3] • Recrystallization of rocks in which new minerals are formed from old, e.g. A + B + C ——> D + E, or A + B——> F Metamorphic Realms Ba lt sa Low P, Hi T Amphibolite Hi P, ite log Ec Low T Glaucophane (blue) schists Basalt and Its Metamorphic Equivalents Amphibolite: Moderate P, T Glaucophane Schist: Hi P, Lo T Eclogite: Very Hi P, Lo T Franciscan blueschist “knocker” in the Berkeley Hills; inset shows a smaller glaucophane schist block with retrograde actinolite Microscopic view of blueschist from Catalina Island SHALE —> MICA SCHIST Metamorphosed limestone ——> marble FOLIATION Increasing P, T ----> Foliation is a set of new planar surfaces...
View Full Document

This note was uploaded on 05/11/2013 for the course GEOL 105Lg taught by Professor Davis,platt during the Fall '07 term at USC.

Ask a homework question - tutors are online