intro_to_geo_13

intro_to_geo_13 - Sedimentary rocks cont Dolostone vs...

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Sedimentary rocks cont. Dolostone vs. limestone Dolostone is composed of the mineral dolomite (CaMg[CO3]2), whereas limestone is composed of calcite, CaCO3 Dolostone contains more magnesium (a trace impurity in natural calcite) and has a different crystalline structure Sedimentary environment The character of sedimentary rocks reflects their environments of deposition Some sedimentary environments include alluvial fan, fluvial, shallow marine, deep marine, glacial; each with its own characteristic sediment Locally, environments change over time; one source of these changes is the sequence of transgressions (rising local relative sea level) and regressions (falling local relative sea level) Along coasts in regions with a hot, dry climate, evaporites are deposited in the supratidal (above the high tide limit) “splash zone,” where water washes up, becomes stranded (having lost contact with the cohesive ocean), and is evaporated by the heat of the Sun
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This note was uploaded on 04/08/2011 for the course GEOL 2001 taught by Professor Babaie during the Winter '09 term at UGA.

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intro_to_geo_13 - Sedimentary rocks cont Dolostone vs...

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