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Paleodepths of the Leg 208 sites at 55 million years ago (Ma) were estimated using a standard thermal subsidence curve and a sediment accumulation model (18). At 55 Ma, the paleodepths of sites 1263 and 1262 were 1.5 and 3.6 km, respectively.
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20444400351
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Materials and methods are available as supporting material on Science Online.
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20444414995
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The initial phase of dissolution would involve Paleocene sediments already present on the sea floor. As such, the base of the clay layer, perhaps as much as a few centimeters in the deepest site, was deposited before the carbon isotope excursion. The traces of carbonate remaining must be a mixture of pre-excursion and excursion fragments that survived dissolution.
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24
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20444431337
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2 for each unit of silicate weathered.
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20444417180
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2 will accumulate in the atmosphere and surface ocean before It can be conveyed to the deep sea to be neutralized (27).
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39
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20444405812
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note
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We thank the ODP Leg 208 Science Crew for their contributions and C. John and S. Bohaty for technical assistance. The ODP supplied samples. Supported by NSF grant EAR-0120727 to J.C.Z. and E.T. and by DFC grant no. Ro 1113/3 to U.R.
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