Weddell Fan and associated abyssal plain,Antarctica: Morphology,sediment processes,and factors influencing sediment supply |
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Authors: | John B Anderson Robyn Wright Barbara Andrews |
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Institution: | (1) Department of Geology and Geophysics, Rice University, 77251 Houston, TX;(2) Department of Geology, University of New Mexico, 87131 Albuquerque, NM |
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Abstract: | The newly discovered Weddell Fan, Antarctica, covers 0.75 million km2. The adjacent continental shelf is characterized by deep, rugged topography; the inner shelf is covered by a grounded polar ice sheet. The upper fan has numerous deep, V-shaped canyons that intersect a slope-base, leveed fan valley. Piston cores from the valley contain disorganized gravel grading upward into graded gravel and sand. Levee cores contain interbedded hemipelagic sediments and fine-grained turbidites. The lower fan is sand-rich. Sediment supply to the fan apparently occurred before development of glacial shelf topography and during a more temperate glacial setting. |
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