van Geen, Alexander; Zheng, Y; Bernhard, Joan M; Cannariato, Kevin G; Carriquiry, José D; Dean, Walter E; Eakins, Barry W; Ortiz, Joseph D; Pike, Jennifer (2003): (Table 2) Radiocarbon ages of selected southern Baja California sediment cores [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.841352, Supplement to: van Geen, A et al. (2003): On the preservation of laminated sediments along the western margin of North America. Paleoceanography, 18(4), 1098, https://doi.org/10.1029/2003PA000911
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Published: 2003 (exact date unknown) • DOI registered: 2015-02-05
Abstract:
Piston, gravity, and multicores as well as hydrographic data were collected along the Pacific margin of Baja California to reconstruct past variations in the intensity of the oxygen-minimum zone (OMZ). Gravity cores collected from within the OMZ north of 24°N did not contain laminated surface sediments even though bottom water oxygen (BWO) concentrations were close to 5 µmol/kg. However, many of the cores collected south of 24°N did contain millimeter- to centimeter-scale, brown to black laminations in Holocene and older sediments but not in sediments deposited during the Last Glacial Maximum. In addition to the dark laminations, Holocene sediments in Soledad Basin, silled at 290 m, also contain white coccolith laminae that probably represent individual blooms. Two open margin cores from 430 and 700 m depth that were selected for detailed radiocarbon dating show distinct transitions from bioturbated glacial sediment to laminated Holocene sediment occurring at 12.9 and 11.5 ka, respectively. The transition is delayed and more gradual (11.3-10.0 ka) in another dated core from Soledad Basin. The observations indicate that bottom-water oxygen concentrations dropped below a threshold for the preservation of laminations at different times or that a synchronous hydrographic change left an asynchronous sedimentary imprint due to local factors. With the caveat that laminated sections should therefore not be correlated without independent age control, the pattern of older sequences of laminations along the North American western margin reported by this and previous studies suggests that multiple patterns of regional productivity and ventilation prevailed over the past 60 kyr.
Further details:
Bard, Edouard (1998): Geochemical and geophysical implications of the radiocarbon calibration. Geochimica et Cosmochimica Acta, 62(12), 2025-2038, https://doi.org/10.1016/S0016-7037(98)00130-6
Stuiver, Minze; Reimer, Paula J (1993): Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon, 35(1), 215-230, https://doi.org/10.1017/S0033822200013904
van Geen, Alexander; Shipboard Scientific Party (2001): R/V Melville, Baja California coring cruise OXMZ01MV: Core descriptions and CTD/Rosette data. Technical Report, Lamont–Doherty Geological Observatory, Columbia University, New York, 2001-01
Coverage:
Median Latitude: 23.606887 * Median Longitude: -111.606070 * South-bound Latitude: 23.201200 * West-bound Longitude: -112.720000 * North-bound Latitude: 25.200000 * East-bound Longitude: -111.079200
Date/Time Start: 1999-11-11T00:00:00 * Date/Time End: 1999-11-18T00:00:00
Minimum DEPTH, sediment/rock: 0.0200 m * Maximum DEPTH, sediment/rock: 13.9650 m
Event(s):
OXMZ01MV-GC31 * Latitude: 23.467170 * Longitude: -111.598500 * Date/Time: 1999-11-11T00:00:00 * Elevation: -705.0 m * Campaign: OXMZ01MV * Basis: Melville * Method/Device: Gravity corer (GC)
OXMZ01MV-GC32 * Latitude: 23.610000 * Longitude: -111.560000 * Date/Time: 1999-11-11T00:00:00 * Elevation: -430.0 m * Location: North Pacific/Gulf of California * Campaign: OXMZ01MV * Basis: Melville * Method/Device: Gravity corer (GC)
OXMZ01MV-GC38 * Latitude: 23.220000 * Longitude: -111.080000 * Date/Time: 1999-11-13T00:00:00 * Elevation: -1270.0 m * Location: North Pacific/Gulf of California * Campaign: OXMZ01MV * Basis: Melville * Method/Device: Gravity corer (GC)
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | ||||
2 | Latitude of event | Latitude | ||||
3 | Longitude of event | Longitude | ||||
4 | Elevation of event | Elevation | m | |||
5 | Sample code/label | Sample label | van Geen, Alexander | |||
6 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
7 | Depth, relative | Depth rel | m | van Geen, Alexander | Relative to 1950 AD horizont: To calculate depth relative to the 1950 AD horizon, 25-1.0 = 24 cm was added to depths in GC32 and 159 + 25 - 1.0 = 183 cm to depths in PC10 listed by van Geen et al. (2001); 25 - 1.5 = 23.5 cm was added to depths in GC31 and 156 + 25 - 1.5 = 179.5 cm to depths in PC08; 25 - 0 = 25 cm was added to depths in GC38 and 195 + 25 = 220 cm to depths in PC09; 25 - 5 = 20 cm was added to depths in GC41 and 122 + 25 - 5 = 142 cm to depths in PC14. Mixed benthic foraminifera were dated, with the exception of intervals in the core Soledad Basin labeled 'p' where mixed planktonic foraminifera were used. | |
8 | Age, dated | Age dated | ka | van Geen, Alexander | Age, 14C AMS | |
9 | Age, dated standard error | Age std e | ± | van Geen, Alexander | Age, 14C AMS | |
10 | Calendar age | Cal age | ka BP | van Geen, Alexander | Age, 14C calibrated | |
11 | Calendar age, standard error | Cal age std e | ± | van Geen, Alexander | Age, 14C calibrated | |
12 | Reservoir age | Res age | ka | van Geen, Alexander | ||
13 | Reservoir age, standard error | Res age e | ± | van Geen, Alexander | ||
14 | Age, comment | Comm | van Geen, Alexander | Intervals where the polynomial Calendar age = (-3.0126*10-6 * (Res. corr. 14C age)2 + (1.2896 * Res. corr. 14C age) - 1005 of Bard (1998) rather than the Calib 4.3 program of Stuiver and Reimer (1993) was used to convert radiocarbon ages. |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
438 data points
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