Clastic%20mineralogy0

Clastic mineralogy - MINERALOGY OF CLASTIC ROCKS In class we will examine the following What controls abundance of any mineral in a sedimentary

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MINERALOGY OF CLASTIC ROCKS In class, we will examine the following: What controls abundance of any mineral in a sedimentary rock – thus, what can we use mineralogy to interpret What are the common constituents of sedimentary rocks Compositional maturity – what it is and what controls it Homework #4 – Mineralogy of the Pass Peak Fm
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Why do we care about the mineralogy? What can we hope to interpret from the mineralogy of clastic rocks? This is related to question of what controls abundance of particular minerals in a clastic sedimentary rock
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Granite with quartz, feldspar, hornblende 1. Lithology of the source rock – this determines what minerals or rock types are available to end up in a sedimentary rock
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2. Chemical and mechanical stability of a particular mineral or rock type because the mineral has to get from the source to the depositional site - for chemical stability, opposite to Bowen's reaction series as we have already discovered
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- for mechanical stability depends on hardness and cleavage • Harder minerals like quartz are generally more stable than soft minerals like gypsum or calcite •Cleavages are planes of easy breaking so they make minerals susceptible to breakdown Cleavage planes in halite
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Quartz has fracture but 0 cleavages. So it is mechanically stable
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Feldspar is more susceptible to chemical weathering and, although hard, has cleavage, so more susceptible to mechanical weathering than quartz Feldspar with two cleavages or planes of easy breakage
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Biotite (and other micas) are soft and break along cleavage planes so more susceptible than quartz or feldspar
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3. Climate in the source area – as we have seen this determines the weathering conditions and, thus, what minerals will make it to the depositional site
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2. Common constituents:
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This note was uploaded on 03/02/2010 for the course GEOL 3430 taught by Professor Kraus during the Spring '10 term at Colorado.

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Clastic mineralogy - MINERALOGY OF CLASTIC ROCKS In class we will examine the following What controls abundance of any mineral in a sedimentary

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