PHYSICAL GEOLOGY 1330 DR MIKE MURPHY 116S&R 1 MMURPHYMAILUHEDU

OVERWEIGHT OBESITY AND LACK OF PHYSICAL ACTIVITY
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Physical Geology 1330

Physical Geology 1330 Dr. Mike Murphy

116-S&R 1 [email protected]

Metamorphic Rocks 333-S&R-1

PHYSICAL GEOLOGY 1330 DR MIKE MURPHY 116S&R 1 MMURPHYMAILUHEDU www.uh.edu/~mamurph2/homepage.html



PHYSICAL GEOLOGY 1330 DR MIKE MURPHY 116S&R 1 MMURPHYMAILUHEDU

Today’s Outline

1) Heat

(2) Stress

(3) Fluids


Metamorphism – The solid-state change in composition and/or texture of a rock due to high temperatures, pressures and/or fluids in the earth.


Variables of Metamorphism

1.

2.

a.

b.

3.


Metamorphic Grade – refers to the intensity of metamorphism





Types of Metamorphism

  1. Contact Metamorphism - Changes caused by the high temperature of an intruding magma, which can “bake” the surrounding rock.










2. Regional Metamorphism - Changes caused by the high temperature and deviatoric stresses associated with mountain building.









3. Cataclastic Metamorphism - Grain-size reduction of the rock caused by fracturing due to movement along faults.



Stability of Minerals


•Most minerals are stable over a relatively narrow range of P and T (e.g., ice unstable above 0°C).

•The stability range of different minerals overlaps and provides constraints on the metamorphic history of rocks.

PHYSICAL GEOLOGY 1330 DR MIKE MURPHY 116S&R 1 MMURPHYMAILUHEDU






Metamorphic Reactions

Prograde reactions – mineral changes that take place during an increase in the temperature of a rock.


Retrograde reactions – mineral changes that take place during a decrease in temperature of a rock


Metamorphic Pressure-Temperature Paths –







Classification of Metamorphic Rocks

Texture – Foliated

Non-foliated

Composition –


Metamorphic Foliation - The parallel alignment of recrystallized minerals





Increasing Intensity of Metamorphism (Figure 8.7)

PHYSICAL GEOLOGY 1330 DR MIKE MURPHY 116S&R 1 MMURPHYMAILUHEDU










Gneissic Foliation –



Schistosity (Schistosic Foliation) –



Protolith – The rock that was metamorphosed to become the metamorphic rock


Examples of Protoliths

•Marble ------ Limestone

•Quartzite --- Quartz Sandstone

•Slate --------- Shale

•Orthogneiss ------- Granite

•Paragneiss ------- Sandstone









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