GEO 421 Petrology

Test #2 Review; 2004

            This test will included the portions of the IGNEOUS unit not covered on test#1, and ALL of the SEDIMENTARY unit. Igneous material includes generation of igneous rocks by melting, field relations of igneous rocks, and tectonic settings of igneous rocks.

IGNEOUS CHAPTERS to review (BUT, see WEBSITE):

            Chapter 2

            Chapter 10

Also... Chapters 6, 7, 8, and 11, particularly with respect to models of melting. Your notes will be helpful here, particularly affects on melt compositions of pressure, water, carbon dioxide, etc. How do the phase diagrams change with pressure, and what are the implications? Review old quizzes.

OTHERWISE, make sure you know...

            ■          Tectonic settings of igneous rocks, volcanic and plutonic

            ■          Famous localities

            ■          Types of igneous intrusions, volcanic types, eruption styles

SEDIMENTARY CHAPTERS to review (especially those bolded):

            Chapters 12, 13, 14, 15, 17,

            Look over Chapters 19 (carbonates) and 20 (evaporites). Know relative solubilities for common evaporite minerals. The law of superposition applies to the formation of evaporite layers, just as it does for gravity-stratified mafic complexes.

Also be sure you know...

            ►          How to assess provinance

            ►          How to classify sandstones and other clastic sediments

            ►          How to assess maturity

            ►          tectonic environments (what sedimentary rocks are commonly found in continental rifts, deltas, continental shelf, deep ocean, subduction trenches, etc.

            ►          Know about various facies and how they are defined; what are flysch and molasse, miogeoclines and eugeoclines, cyclothems, Bouma beds, redbeds, eolian, lacustrine, fluvial...

            ►          If particular formations were mentioned more than once in class (or lab) make sure you know important particulars about them. Example: St. Peter SS, Utica Shale, Navajo ss, etc. Know composition and age.

            ►          Review chemical weathering (read text sections)