scholarly journals Dynamic deep-water circulation in the northwestern Pacific during the Eocene: Evidence from Ocean Drilling Program Site 884 benthic foraminiferal stable isotopes (δ18O and δ13C)

Geosphere ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1204-1225 ◽  
Author(s):  
C. Borrelli ◽  
M.E. Katz
Keyword(s):  
Stable Isotopes ◽  
Deep Water ◽  
Water Circulation ◽  
Northwestern Pacific ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Δ18o And Δ13c

scholarly journals The Nazca Drift System – palaeoceanographic significance of a giant sleeping on the SE Pacific Ocean floor

2021 ◽  
pp. 1-15
Author(s):  
Gérôme Calvès ◽  
Alan Mix ◽  
Liviu Giosan ◽  
Peter D. Clift ◽  
Stéphane Brusset ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Water ◽  
Bottom Current ◽  
Ocean Drilling Program ◽  
Nazca Plate ◽  
Ocean Drilling ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Nazca Ridge ◽  
Sea Currents

Abstract The evolution and resulting morphology of a contourite drift system in the SE Pacific oceanic basin is investigated in detail using seismic imaging and an age-calibrated borehole section. The Nazca Drift System covers an area of 204 500 km2 and stands above the abyssal basins of Peru and Chile. The drift is spread along the Nazca Ridge in water depths between 2090 and 5330 m. The Nazca Drift System was drilled at Ocean Drilling Program Site 1237. This deep-water drift overlies faulted oceanic crust and onlaps associated volcanic highs. Its thickness ranges from 104 to 375 m. The seismic sheet facies observed are associated with bottom current processes. The main lithologies are pelagic carbonates reflecting the distal position relative to South America and water depth above the carbonate compensation depth during Oligocene time. The Nazca Drift System developed under the influence of bottom currents sourced from the Circumpolar Deep Water and Pacific Central Water, and is the largest yet identified abyssal drift system of the Pacific Ocean, ranking third in all abyssal contourite drift systems globally. Subduction since late Miocene time and the excess of sediments and water associated with the Nazca Drift System may have contributed to the Andean orogeny and associated metallogenesis. The Nazca Drift System records the evolution in interactions between deep-sea currents and the eastward motion of the Nazca Plate through erosive surfaces and sediment remobilization.

Age constraints on the origin and growth history of a deep-water coral mound in the northeast Atlantic drilled during Integrated Ocean Drilling Program Expedition 307

Geology ◽  
2007 ◽  
Vol 35 (11) ◽  
pp. 1051 ◽  
Author(s):  
Akihiro Kano ◽  
Timothy G. Ferdelman ◽  
Trevor Williams ◽  
Jean-Pierre Henriet ◽  
Tsuyoshi Ishikawa ◽  
...  
Keyword(s):  
Deep Water ◽  
Ocean Drilling Program ◽  
Northeast Atlantic ◽  
Ocean Drilling ◽  
Integrated Ocean Drilling Program ◽  
Growth History ◽  
History Of ◽  
Age Constraints ◽  
Water Coral

Late Paleocene to Eocene paleoceanography of the equatorial Pacific Ocean: Stable isotopes recorded at Ocean Drilling Program Site 865, Allison Guyot

1995 ◽  
Vol 10 (4) ◽  
pp. 841-865 ◽  
Author(s):  
Timothy J. Bralower ◽  
James C. Zachos ◽  
Ellen Thomas ◽  
Matthew Parrow ◽  
Charles K. Paull ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Pacific Ocean ◽  
Equatorial Pacific ◽  
Equatorial Pacific Ocean ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Late Paleocene

Deep-sea ostracods from the South Atlantic sector of the Southern Ocean during the last 370,000 years

2009 ◽  
Vol 83 (6) ◽  
pp. 914-930 ◽  
Author(s):  
Moriaki Yasuhara ◽  
Thomas M. Cronin ◽  
Gene Hunt ◽  
David A. Hodell
Keyword(s):  
Southern Ocean ◽  
Deep Water ◽  
Deep Sea ◽  
South Atlantic ◽  
Water Circulation ◽  
Interglacial Period ◽  
The South ◽  
Ocean Drilling Program ◽  
Atlantic Sector ◽  
Quaternary Climate

We report changes of deep-sea ostracod fauna during the last 370,000 yr from the Ocean Drilling Program (ODP) Hole 704A in the South Atlantic sector of the Southern Ocean. The results show that faunal changes are coincident with glacial/interglacial-scale deep-water circulation changes, even though our dataset is relatively small and the waters are barren of ostracods until mid-MIS (Marine Isotope Stage) 5.KritheandPoseidonamicuswere dominant during the Holocene interglacial period and the latter part of MIS 5, when this site was under the influence of North Atlantic Deep Water (NADW). Conversely,HenryhowellaandLegitimocytherewere dominant during glacial periods, when this site was in the path of Circumpolar Deep Water (CPDW). Three new species (Aversovalva brandaoae, Poseidonamicus hisayoae, andKrithe mazziniae) are described herein. This is the first report of Quaternary glacial/interglacial scale deep-sea ostracod faunal changes in the Southern and South Atlantic Oceans, a key region for understanding Quaternary climate and deep-water circulation, although the paucity of Quaternary ostracods in this region necessitates further research.

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