20_416M_AllochemSkeletal1_handout

20_416M_AllochemSkeletal1_handout - Components of a...

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Components of a Carbonate rock Matrix < 0.03 mm _________ grains ________ grains Cement Pores 1
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Carbonate Constituents: Skeletal Trends in Skeletal Carbonate Producers with Time distribution, abundance, & Mineralogy Review of Major Carbonate Producers Foraminiferida Mollusca Brachiopoda Echinodermata Bryozoa Cnidaria Porifera Crustacea Calcareous Algae Cyanobacteria 2
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Differentiation of Fossil Allochems 1. ___________ 2. Size 3. Skeletal microstructure 4. Mineralogy Allochem? a term introduced by Folk (1959) to describe the recognisable 'grains' in carbonate rocks . Any fragment from around ½mm upwards in size may be considered an allochem. 3
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Morphology Trilobites Gastropods 4
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Size Bivalves & Ostracodes Gastropods & Forams 5
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Mineralogy X = common, 0 = rare, x ---- x gives range of MgCO 3 content 6
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Temporal Distribution of Major Faunal Groups 7
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Variations in Mineralogy w/Time 8
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Temporal Distribution of Major Faunal Groups 9
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Carbonate Producers: Foraminifera
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This note was uploaded on 04/04/2011 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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20_416M_AllochemSkeletal1_handout - Components of a...

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