Effects of dynamic topography on the Cenozoic carbonate compensation depth

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doi: 10.1002/2017GC007386
Author(s): Campbell, Siobhan M.; Moucha, Robert; Derry, Louis A.; Raymo, Maureen E.
Author Affiliation(s): Primary:
Syracuse University, Department of Earth Sciences, Syracuse, NY, United States
Other:
Cornell University, United States
Columbia University, United States
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 19(4), p.1025-1034. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 47 refs.; illus.
Summary: Reconstructions of the carbonate compensation depth (CCD) in the past have been used to inform hypotheses about the nature of weathering, tectonics, climate change, and the major ion content of the world's oceans over the Cenozoic. These reconstructions are sensitive to uncertainties in the input data, in particular, the paleodepth estimates of sediment cores. Here we propose that a significant, previously unconsidered contributor to uncertainties in paleodepth estimates is from dynamic topography produced by radial stresses exerted on the Earth's surface by the convecting mantle; these stresses can warp the ocean floor by hundreds of meters over broad regions and also vary significantly over millions of years. We present new reconstructions of the equatorial Pacific and Indian Ocean CCDs over the last 30 and 23 Myr, respectively, which demonstrate an overall deepening trend since the Miocene, and illustrate the possible effect of long-term changes in dynamic topography on these reconstructions. Abstract Copyright (2018), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2018
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 18 Geophysics, Solid-Earth; Bottom features; Carbonate compensation depth; Carbonate rocks; Cenozoic; Convection; DSDP Site 574; DSDP Site 70; Deep Sea Drilling Project; Dynamics; East Pacific; Equatorial Pacific; Expedition 320; Expedition 321; Expeditions 320/321; IPOD; Indian Ocean; Integrated Ocean Drilling Program; Leg 115; Leg 199; Leg 8; Leg 85; Mantle; Miocene; Neogene; North Pacific; Northeast Pacific; ODP Site 1218; ODP Site 1219; ODP Site 1220; Ocean Drilling Program; Ocean floors; Pacific Ocean; Paleo-oceanography; Paleodepth; Reconstruction; Sedimentary rocks; Tertiary; Topography
Record ID: 2018068097
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union

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