Core logging

Core logging - currents. One turbidity current is deposited...

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Field Methods Interpretation of Core Samples The Canyon Group core sample contains many sedimentary structures, ranging from soft sediment deformation such as flame structures, convolute bedding, slumping, bioturbation, and also graded bedding, ripples, trough crossbedding, and rip-up clasts. The core as a hole is not fossiliferous, but some fossil fragments appear at 2678 – 2671 ft. The low abundance of marine fossils and high abundance of dark organic rich shale is diagnostic of a deep sea facies. Which type of deep sea facies can further be deduced by observing the structures and where they appear. The large variety of structures is concluded to be related to a submarine fan. Throughout the core, sequences such as soft sediment deformation, debris flow structures including scowering, ripples, or laminations repeat. This repetition is interpreted to be successive turbidity
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Unformatted text preview: currents. One turbidity current is deposited and as the next begins to be deposited, it scowers out bedding causing parts of the sequence to be removed and possibly deposited later as a clast. The high abundance of shale in the basal section of the core may be due to its location. The basal section may be located along the lower fan, allowing for only fine to silt size grains to be deposited due to the distance from the source. Moving up through the section, relative grain size increases from shale to conglomerate and samples are normally graded. The increase in grain size can be correlated to the movement of the submarine fan seaward. The seaward movement is indicative of progradation. References My Sed. Strat. Notes...
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This note was uploaded on 07/17/2011 for the course GEOL 4321 taught by Professor Staff during the Spring '11 term at Texas Tech.

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Core logging - currents. One turbidity current is deposited...

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