Iron-cemented sediment on lower continental slope off Cape Hatteras |
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Authors: | Peter A Rona Kurt Boström Daniel Jean Stanley |
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Institution: | (1) Atlantic Oceanographic and Meteorological Laboratories, National Oceanic and Atmospheric Administration, 4301 Rickenbacker Causeway, 33149 Miami, FL;(2) Department of Geology, University of Stockholm, S-113 86 Stockholm, Sweden;(3) Division of Sedimentology, Smithsonian Institution, 20560 Washington, DC |
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Abstract: | The textural, mineralogical, compositional and paleontological characteristics of an iron-cemented allochthonous sediment
slab recovered from a zone of slumping between water depths of 2,100 and 2,350 m on the lower continental slope off Cape Hatteras
are summarized. Results support interpretation of the sediment slab as the oxidized equivalent of pyrite-cemented Pleistocene
to Recent sediment, an uncommon form of lithification in deep sea sediments. We propose that exposure of such slumped sediment
slabs to seawater has produced an alteration sequence from pyrite-cement to iron oxide-cement. These observations extend the
range of pyrite-cemented sediment initially reported from water depths between 4,770 and 4,950 m on the lower continental
rise off Cape Hatteras. |
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