American Geophysical Union (AGU)

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Carbon isotope ratio of Cenozoic CO2: A comparative evaluation of available geochemical proxies
American Geophysical Union (AGU) - Tập 25 Số 3 - 2010
Brett J. Tipple, Stephen R. Meyers, Mark Pagani
Deglacial whole-ocean δ13C change estimated from 480 benthic foraminiferal records
American Geophysical Union (AGU) - Tập 29 Số 6 - Trang 549-563 - 2014
Carlye D. Peterson, L. E. Lisiecki, Joseph V. Stern
Fluctuations in the trophic resource continuum: A factor in global diversity cycles?
American Geophysical Union (AGU) - Tập 2 Số 5 - Trang 457-471 - 1987
Pamela Hallock
The trophic resource continuum (TRC) in euphotic zones of the world's oceans is the spectrum of conditions from the richest runoff and upwelling areas to the most nutrient deficient subtropical seas. That spectral range has likely varied through geologic history as more efficient phytoplankton taxa evolved, as oceanic circulation rates changed, and in response to oceanic‐mixing events. Red...... hiện toàn bộ
How synchronous are neogene marine plankton events?
American Geophysical Union (AGU) - Tập 9 Số 5 - Trang 739-763 - 1994
Cinzia Spencer‐Cervato, Hans R. Thierstein, David Lazarus, Jean‐Pierre Beckmann
An electronic supplement of this material may be obtained on adiskette or Anonymous FTP from KOSMOS.AGU.ORG. (LOGIN toAGU's FTP account using ANONYMOUS as the username andGUEST as the password. Go to the right directory by typing CDAPEND. Type LS to see what files are available. Type GET and thename of the file to get it. Finally, type EXIT to leave the system.)(Paper 94PA01456, How synchr...... hiện toàn bộ
Benthic phosphorus regeneration, net primary production, and ocean anoxia: A model of the coupled marine biogeochemical cycles of carbon and phosphorus
American Geophysical Union (AGU) - Tập 9 Số 5 - Trang 677-692 - 1994
Philippe Van Cappellen, Ellery D. Ingall
We examine the relationships between ocean ventilation, primary production, water column anoxia, and benthic regeneration of phosphorus using a mass balance model of the coupled marine biogeochemical cycles of carbon (C) and phosphorus (P). The elemental cycles are coupled via the Redfield C/P ratio of marine phytoplankton and the C/P ratio of organic matter preserved in marine sediments. ...... hiện toàn bộ
An apparent contradiction in the role of phosphorus in Cenozoic chemical mass balances for the World Ocean
American Geophysical Union (AGU) - Tập 9 Số 4 - Trang 513-527 - 1994
Margaret Lois Delaney, Gabriel M. Filippelli
Little is known about the fluxes to and from the ocean during the Cenozoic of phosphorus (P), a limiting nutrient for oceanic primary productivity and organic carbon burial on geologic timescales. Previous studies have concluded that dissolved river fluxes increased worldwide during the Cenozoic and that organic carbon burial decreased relative to calcium carbonate burial and perhaps in ab...... hiện toàn bộ
Tethyan carbonate carbon isotope stratigraphy across the Jurassic‐Cretaceous boundary: An indicator of decelerated global carbon cycling?
American Geophysical Union (AGU) - Tập 4 Số 4 - Trang 483-494 - 1989
Helmut Weissert, James E T Channell
The carbon isotope record in four pelagic carbonate sections from the Southern Alps (northern Italy) across the Jurassic‐Cretaceous boundary has been correlated to biostratigraphy and magnetostratigraphy. The carbon isotope curve from bulk carbonates shows a decrease from Kimmeridgian to Early Tithonian (CM24–CM22) values of δ13C=+2.07 (± 0.14)‰ to Late Tithonian and B...... hiện toàn bộ
Sedimentation history of the South Pacific pelagic clay province over the last 85 million years Inferred from the geochemistry of Deep Sea Drilling Project Hole 596
American Geophysical Union (AGU) - Tập 7 Số 4 - Trang 441-465 - 1992
Lei Zhou, Frank T. Kyte
Geochemical analyses of sediments from the top 24.5 m of Deep Sea Drilling Project hole 596 (23°51.20′S, 169°39.27′W) show great variability in the composition of pelagic clays accumulated in the South Pacific since the late Cretaceous. Elemental associations indicate that most of this variability can be attributed to variations in abundances of six sediment end‐member components: detrital...... hiện toàn bộ
The Himalayas, organic carbon burial, and climate in the Miocene
American Geophysical Union (AGU) - Tập 9 Số 3 - Trang 399-404 - 1994
Maureen E. Raymo
Cooling ages of rock in the Himalayas imply that rapid exhumation between the Main Central thrust system and the South Tibetan detachment system occurred between 21 and 17 Ma. The generation of relief and enhanced weathering which followed this event may have resulted in a pronounced increase in the delivery of dissolved strontium, carbon, phosphorus, and other chemical weathering products...... hiện toàn bộ
Pacific pelagic phosphorus accumulation during the last 10 M.Y.
American Geophysical Union (AGU) - Tập 3 Số 1 - Trang 113-136 - 1988
Judith B. Moody, Louis R Chaboudy, Thomas R. Worsley
As a limiting nutrient to marine life, phosphorus (P) is an effective tracer of today's marine productivity. The distribution of P in marine sediments likewise tracks the history of marine productivity because of its relative insolubility in seawater. CaCO3, biogenic opal, terrigenous sediment, and total P have been measured in cores from nine Pacific sites (Deep Sea D...... hiện toàn bộ
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