Citation:

j.palaeo.2011.02.004

Name: Late Neogene benthic foraminifera and stable carbon isotope record of the blake Outer Ridge
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2011 (exact date unknown) • DOI registered: 2012-03-09

RIS Citation BibTeX Citation Text Citation ShareShow Map Google Earth

Abstract:

Carbon isotope and benthic foraminiferal data from Blake Outer Ridge, a sediment drift in the western North Atlantic (Ocean Drilling Program Sites 994 and 997, water depth ~ 2800 m), document variability in the relative volume of Southern Component (SCW) and Northern Component Waters (NCW) over the last 7 Ma. SCW was dominant before ~5.0 Ma, at ~3.6-2.4 Ma, and 1.2-0.8 Ma, whereas NCW dominated in the warm early Pliocene (5.0-3.6 Ma), and at 2.4-1.2 Ma. The relative volume of NCW and SCW fluctuated strongly over the last 0.8 Ma, with strong glacial-interglacial variability. The intensity of the Western Boundary Undercurrent was positively correlated to the relative volume of NCW. Values of Total Organic Carbon (TOC) were > 1.5% in sediments older than ~ 3.8 Ma, and not correlated to high primary productivity indicators, thus may reflect lateral transport of organic matter. TOC values decreased during the intensification of the Northern Hemisphere Glaciation (NHG, 3.8-1.8 Ma). Benthic foraminiferal assemblages underwent major changes when the sites were dominantly under SCW (3.6-2.4 and 1.2-0.8 Ma), coeval with the 'Last Global Extinction' of elongate, cylindrical deep-sea benthic foraminifera, which has been linked to cooling, increased ventilation and changes in the efficiency of the biological pump. These benthic foraminiferal turnovers were neither directly associated with changes in dominant bottom water mass nor with changes in productivity, but occurred during global cooling and increased ventilation of deep waters associated with the intensification of the NHG.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 31.800050 * Median Longitude: -75.526575 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545900 * North-bound Latitude: 31.843100 * East-bound Longitude: -75.468600

Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-12-10T00:10:00

Event(s):

164-994C * Latitude: 31.785700 * Longitude: -75.545900 * Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-11-15T01:10:00 * Elevation: -2799.1 m * Penetration: 703.5 m * Recovery: 501.47 m * Location: North Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 84 cores; 703.5 m cored; 0 m drilled; 71.3 % recovery

164-997A * Latitude: 31.843100 * Longitude: -75.468600 * Date/Time Start: 1995-12-06T12:35:00 * Date/Time End: 1995-12-10T00:10:00 * Elevation: -2770.1 m * Penetration: 434.3 m * Recovery: 342.66 m * Location: Nicaraguan Rise, North Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 434.3 m cored; 0 m drilled; 78.9 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

Bhaumik, AK; Gupta, AK; Thomas, E (2011): (Table 3) Authigenic carbonate growth of broken benthic foraminifera species from ODP Hole 164-994C. https://doi.org/10.1594/PANGAEA.775838
Bhaumik, AK; Gupta, AK; Thomas, E (2011): (Table S1) Stable carbon and oxygen isotope ratios of Cibicides wuellerstorfi from ODP Hole 164-994C. https://doi.org/10.1594/PANGAEA.775830
Bhaumik, AK; Gupta, AK; Thomas, E (2011): (Table S1) TOC content of ODP Hole 164-994C. https://doi.org/10.1594/PANGAEA.775831
Bhaumik, AK; Gupta, AK; Thomas, E (2011): (Table S3) Significant benthic foraminifera species in ODP Hole 164-997A. https://doi.org/10.1594/PANGAEA.775826