Sedimentary Archives

Sedimentary Archives - Sedimentary Archives What determines...

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1 Sedimentary Archives What determines which type of sedimentary rock forms in different environs? • Tectonic setting • Type of rock being weathered • Type of transport • Climate • Amount of pressure & temperature • Time Sedimentary Environments • Depositional basins • Cratons • Shields/platforms • Orgenic belts Sedimentary Environments North American tectonics Sedimentary environments
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2 Basically, all these environments can fit into three groups. • Marine • Transitional • Continental Marine Marine derived sediments give clues to… • Paleo depth • Distance from land • Turbidity currents Change in sediment tells us the water depth Transitional-shelf Transitional sediments • Deltas • Barrier islands, beaches, etc
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3 Deltas Continental Continental sediments • Alluvial deposits • Lacustrine deposits • Glacial deposits • Eolian deposits Rock Color significance • Black • Red Rock Texture • Texture of a sedimentary rock tells a lot about its origin • Three textural components – Clasts – Matrix – Cement
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Sedimentary Archives - Sedimentary Archives What determines...

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