Sed%20props%20powerpt

Sed%20props%20powerpt - Clastic Textures Reading Chapter 3...

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Reading – Chapter 3 Lab – describing properties of grains including size and shape In class we will focus on what we can interpret from clastic texture Clastic Textures –
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Clastic Textures Clastic rocks have 3 major components: framework grains matrix cement Let’s draw a picture
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What property do we use to distinguish matrix from framework grains? Let’s look at 3 different kinds of clastic rock and determine: – What constitutes the framework grains for each – What constitutes the probable matrix for each.
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Conglomerate Sandstone Siltstone
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Matrix depends on SIZE of the framework grains
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Calcite cement Qtz Qtz Qtz
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Calcite
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Calcite Cement (C) and Quartz Cement (A) as overgrowths
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How does calcite or quartz cement form? A. It is deposited at same time as grains and matrix B. It is precipitated after the grains and matrix are deposited C. It is both deposited and precipitated D. None of these!
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Where does cement come from?
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When in the history of a sedimentary rock does cement form?
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Properties of framework grains Sedimentary texture is probably a function of what properties? Look at the example and think about what the key textural properties might be.
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Sedimentary texture is probably a function of all of the following except which one? A. Particle size B. Particle shape C. Particle mineralogy D. Arrangement of particles in the sediment or sedimentary rock E. Actually, all of these are aspects of sediment texture
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What are the units of grain size and how do we measure grains size? Why is grain size the key property for sediment texture?
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Sed%20props%20powerpt - Clastic Textures Reading Chapter 3...

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