Citation:

31447

Name: Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi, and CaCO3 and sand content of ODP Hole 165-999A
Published: 1998
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The Late Cenozoic closure of the seaway between the North andSouth American continents is thought to have caused extensive changes in ocean circulation and Northern Hemisphere climate (Keigwin, 1982, doi:10.1126/science.217.4557.350; Maier-Reiners et al., 1990, doi:10.1029/PA005i003p00349). But the timing and consequences of the emergence of the Isthmus of Panama, which closed the seaway, remain controversial (Keigwin, 1982, doi:10.1126/science.217.4557.350; Maier-Reiners et al., 1990, doi:10.1029/PA005i003p00349; Duque-Caro, 1990, doi:10.1016/0031-0182(90)90178-A; Keller et al., 1989, doi:10.1016/0895-9811(89)90028-X; Collins et al., 1996, doi:10.1130/0091-7613(1996)024<0687:TLMPIS>2.3.CO;2). Here we present stable-isotope and carbonate sand-fraction records from Caribbean sediments which, when compared to Atlantic and Pacific palaeoceanographic records, indicate that the closure caused a marked reorganization of ocean circulation starting 4.6 million years ago. Shallowing of the seaway intensified the Gulf Stream and introduced warm and saline water masses to high northern latitudes. These changes strengthened deep-water formation in the Labrador Sea over the next million years - as indicated by an increased deep-water ventilation and carbonate preservation in the Caribbean Sea - and favoured early Pliocene warming of the Northern Hemisphere. The evaporative cooling of surface waters during North Atlantic Deep Water formation would have introduced moisture to the Northern Hemisphere. Although the pronounced intensification of Northern Hemisphere glaciation between 3.1 and 2.5 million years ago substantially lagged the full development of North Atlantic Deep Water formation, we propose that the increased atmospheric moisture content was a necessary precondition for ice-sheet growth, which was then triggered by the incremental changes in the Earth's orbital obliquity.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 12.744000 * Longitude: -78.739300

Date/Time Start: 1996-01-10T19:30:00 * Date/Time End: 1996-01-14T23:15:00

Minimum DEPTH, sediment/rock: 55.15 m * Maximum DEPTH, sediment/rock: 159.85 m

Event(s):

165-999A * Latitude: 12.744000 * Longitude: -78.739300 * Date/Time Start: 1996-01-10T19:30:00 * Date/Time End: 1996-01-14T23:15:00 * Elevation: -2828.0 m * Penetration: 566.1 m * Recovery: 534.83 m * Location: Caribbean Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 61 core; 566.1 m cored; 0 m drilled; 94.5 % recovery

Comment:

DEPTH, sedimen [m] is given in mbsf.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Haug, Gerald H	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	Depth, sediment revised	Depth revised	m	Haug, Gerald H		corrected depth
4	AGE	Age	ka BP			Geocode
5	Cibicidoides wuellerstorfi, δ13C	C. wuellerstorfi δ13C	‰ PDB	Haug, Gerald H
6	Cibicidoides wuellerstorfi, δ18O	C. wuellerstorfi δ18O	‰ PDB	Haug, Gerald H
7	Sand	Sand	%	Haug, Gerald H
8	Accumulation rate, sand > 63 µm	Acc rate >63 µm	g/cm²/ka	Haug, Gerald H
9	Sand	Sand	%	Haug, Gerald H		of 100 % CaCO3
10	Calcium carbonate	CaCO3	%	Haug, Gerald H

License:

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

Size:

8303 data points

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