Data Report: Late Pliocene-Pleistocene Carbon and Oxygen Stable Isotopes from Benthic Foraminifers at Ocean Drilling Program Site 1123 in the Southwest Pacific

2002 ◽  
Author(s):  
S.E. Harris
Keyword(s):  
Stable Isotopes ◽  
Ocean Drilling Program ◽  
Benthic Foraminifers ◽  
Late Pliocene ◽  
Southwest Pacific ◽  
Ocean Drilling ◽  
Oxygen Stable Isotopes

scholarly journals A review of the ecological affinities of marine organic microfossils from a Holocene record offshore of Adélie Land (East Antarctica)

2018 ◽  
Vol 37 (2) ◽  
pp. 445-497 ◽  
Author(s):  
Julian D. Hartman ◽  
Peter K. Bijl ◽  
Francesca Sangiorgi
Keyword(s):  
Sea Ice ◽  
Ocean Drilling Program ◽  
Benthic Foraminifers ◽  
Photographic Images ◽  
Ocean Drilling ◽  
Integrated Ocean Drilling Program ◽  
Holocene Record ◽  
High Degree ◽  
The Antarctic ◽  
Export Productivity

Abstract. Integrated Ocean Drilling Program (IODP) Expedition 318 recovered a  ∼ 170 m long Holocene organic-rich sedimentary sequence at Site U1357. Located within the narrow but deep Adélie Basin close to the Antarctic margin, the site accumulated sediments at exceptionally high sedimentation rates, which resulted in extraordinary preservation of the organic sedimentary component. Here, we present an overview of 74 different mainly marine microfossil taxa and/or types found within the organic component of the sediment, which include the remains of unicellular and higher organisms from three eukaryotic kingdoms (Chromista, Plantae, and Animalia). These remains include phytoplanktonic (phototrophic dinoflagellates and prasinophytes) and very diverse zooplanktonic (heterotrophic dinoflagellates, tintinnids, copepods) organisms. We illustrate each marine microfossil taxon or type identified by providing morphological details and photographic images, which will help with their identification in future studies. We also review their ecological preferences to aid future (palaeo)ecological and (palaeo)environmental studies. The planktonic assemblage shows a high degree of endemism related to the strong influence of the sea-ice system over Site U1357. In addition, we found the remains of various species of detritus feeders and bottom-dwelling scavengers (benthic foraminifers and annelid worms) indicative of high export productivity at Site U1357. This study shows the potential of organic microfossil remains for reconstructing past environmental conditions, such as sea-ice cover and (export) productivity.

scholarly journals Late Pliocene age control and composite depths at ODP Site 982, revisited

2011 ◽  
Vol 7 (3) ◽  
pp. 1631-1646
Author(s):  
N. Khélifi ◽  
M. Sarnthein ◽  
B. D. A. Naafs
Keyword(s):  
Northern Hemisphere ◽  
North Atlantic ◽  
Time Span ◽  
Ocean Drilling Program ◽  
Late Pliocene ◽  
Ocean Drilling ◽  
Proxy Records ◽  
The North ◽  
Sediment Records ◽  
The North Atlantic

Abstract. Ocean Drilling Program (ODP) Site 982 provided a key sediment section at Rockall Plateau for reconstructing northeast Atlantic paleoceanography and monitoring benthic δ18O stratigraphy over the Late Pliocene to Quaternary onset of major Northern Hemisphere Glaciation. A renewed hole-specific inspection of magnetostratigraphic events and the addition of epibenthic δ18O records for short Pliocene sections in holes 982A, B, and C, crossing core breaks in the δ18O record published for Hole 982B, now imply a major revision of composite core depths. After tuning to the orbitally tuned reference record LR04 the new composite δ18O record results in a hiatus, where the Kaena magnetic event might been lost, and in a significant age reduction for all proxy records by 130 to 20 ka over the time span 3.2–2.7 million yr ago (Ma). Our study demonstrates the significance of reliable composite-depth scales and δ18O stratigraphies in ODP sediment records for ocean-wide correlations in paleoceanography and makes Late Pliocene trends found at Site 982 much better comparable to those published from elsewhere in the North Atlantic.

scholarly journals Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited

2012 ◽  
Vol 8 (1) ◽  
pp. 79-87 ◽  
Author(s):  
N. Khélifi ◽  
M. Sarnthein ◽  
B. D. A. Naafs
Keyword(s):  
North Atlantic ◽  
Technical Note ◽  
Time Span ◽  
Sea Surface ◽  
Ocean Drilling Program ◽  
Late Pliocene ◽  
Ocean Drilling ◽  
Proxy Records ◽  
The North ◽  
Sediment Records

Abstract. Ocean Drilling Program (ODP) Site 982 provided a key sediment section at Rockall Plateau for reconstructing northeast Atlantic paleoceanography and monitoring benthic δ18O stratigraphy over the late Pliocene to Quaternary onset of major Northern Hemisphere glaciation. A renewed hole-specific inspection of magnetostratigraphic reversals and the addition of epibenthic δ18O records for short Pliocene sections in holes 982A, B, and C, crossing core breaks in the δ18O record published for Hole 982B, now imply a major revision of composite core depths. After tuning to the orbitally tuned reference record LR04, the new composite δ18O record results in a hiatus, where the Kaena magnetic subchron might have been lost, and in a significant age reduction for all proxy records by 130 to 20 ky over the time span 3.2–2.7 million years ago (Ma). Our study demonstrates the general significance of reliable composite-depth scales and δ18O stratigraphies in ODP sediment records for generating ocean-wide correlations in paleoceanography. The new concept of age control makes the late Pliocene trends in SST (sea surface temperature) and atmospheric pCO2 at Site 982 more consistent with various paleoclimate trends published from elsewhere in the North Atlantic.

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

Globoconella Pseudospinosa, N. Sp.: a New Early Pliocene Planktonic Foraminifera from the Southwest Pacific

2018 ◽  
Vol 48 (4) ◽  
pp. 288-300 ◽  
Author(s):  
Martin P. Crundwell
Keyword(s):  
New Zealand ◽  
Late Miocene ◽  
East Coast ◽  
Planktonic Foraminifera ◽  
Ocean Drilling Program ◽  
Late Pliocene ◽  
Early Pliocene ◽  
Southwest Pacific ◽  
Project Site ◽  
Stratigraphic Ranges

Abstract Studies of topotypes of Truncorotalia crassaconica from the East Coast Basin of New Zealand and populations of Tr. crassaconica at Ocean Drilling Program Site 1123 and Deep Sea Drilling Project Site 284 in the southwest Pacific revealed two morphospecies. One of these is a late Pliocene species, Truncorotalia crassaconica s.s., that has low, slit-like apertures with thin, smooth apertural lips. The other is Globoconella pseudospinosa n. sp., an early Pliocene form with arched apertures and pustulose apertural lips. The short stratigraphic ranges of both species are potentially useful as biostratigraphic markers for the subdivision of Plio-Pleistocene stages in New Zealand and the temperate southwest Pacific. Populations of Gc. pseudospinosa, with mostly sinistrally coiled specimens, occur throughout the lectostratotype of the New Zealand Opoitian Stage at Mangapoike River in the East Coast Basin and are confined to the early Pliocene (Opoitian) at sites 1123 and 284, between 4.57 and 4.10 Ma. Small populations of Tr. crassaconica s.s., with mostly dextrally coiled specimens, occur in the late Pliocene (Waipipian Stage) between 3.53 and 2.98 Ma. Sporadic occurrences of relatively rare, mostly sinistrally coiled specimens of Tr. aff. crassaconica occur earlier at sites 1123 and 284 in the late Miocene to Pliocene between ca. 5.5 and 3.53 Ma. These specimens are distinguished in having open umbilici and almost straight umbilical sutures, similar to the late Miocene specimens of Truncorotalia crassaformis.

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