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Kuroda, Tomoko; Sakamoto, Tatsuhiko; Koizumi, Itaru (2000): (Table 1) Biogenic and terrigenous components and ages of ODP Hole 167-1020B sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.794530, Supplement to: Kuroda, T et al. (2000): Data Report: Temporal variations of biogenic components on the northern California margin since the late Pleistocene, Site 1020. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-4, https://doi.org/10.2973/odp.proc.sr.167.232.2000

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Abstract:
The California Current and associated coastal upwelling have changed with the growth and decay of the North American ice sheets since 2.5 Ma. Because the coastal upwelling has a close relationship with biogenic productivity in surface water, analyses of biogenic components in sediments of the upwelling region enable us to reconstruct the past changes of the productivity and/or the current systems.
In this study, we analyzed biogenic silica and carbonate as well as organic carbon in sediments from the northern California margin, Hole 1020B. The results show that terrigenous-free content of biogenic silica is high during interglacial periods since 800 ka and varies in correspondence with 100-k.y. glacial-interglacial cycles. On the other hand, terrigenous-free content of biogenic carbonate is high during glacial periods. These temporal variations may have been caused by changes in the origin of deep water.
Project(s):
Coverage:
Latitude: 41.009000 * Longitude: -126.434000
Date/Time Start: 1996-06-08T13:50:00 * Date/Time End: 1996-06-10T20:15:00
Minimum DEPTH, sediment/rock: 0.7 m * Maximum DEPTH, sediment/rock: 74.5 m
Event(s):
167-1020B * Latitude: 41.009000 * Longitude: -126.434000 * Date/Time Start: 1996-06-08T13:50:00 * Date/Time End: 1996-06-10T20:15:00 * Elevation: -3038.0 m * Penetration: 278.8 m * Recovery: 265 m * Location: North Pacific Ocean * Campaign: Leg167 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 30 cores; 278.8 m cored; 0 m drilled; 95.1 % recovery
Comment:
DEPTH, sediment is given in mbsf.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelKuroda, TomokoODP sample designation
2DEPTH, sediment/rockDepthmGeocode
3Depth, compositeDepth compmcdKuroda, Tomoko
4Age modelAge modelkaKuroda, Tomokousing data from Mix et al. (1995, doi:10.2973/odp.proc.sr.138.120.1995)
5Opal, biogenic silicabSiO2%Kuroda, TomokoOpal, extraction; Mortlock & Froelich, 1989method modified
6Carbonate, biogenicCarb biog%Kuroda, TomokoCalculated= TIC (wt%) x 8.34
7Carbon, organic, totalTOC%Kuroda, TomokoCarbon analyser, LECO
8TerrigenousTerr%Kuroda, TomokoCalculatedtotal; = 100 - [biogenic silica (wt%) + biogenic carbonate (wt%) + TOC (wt%)]
9Quartz, intensityQzcpsKuroda, TomokoX-ray diffraction (XRD)Qz(101)
10Opal, biogenic silicabSiO2%Kuroda, TomokoOpal, extraction; Mortlock & Froelich, 1989of total bSiO2, Carb biog and TOC
11Carbonate, biogenicCarb biog%Kuroda, Tomokoof total bSiO2, Carb biog and TOC
12Carbon, organic, totalTOC%Kuroda, Tomokoof total bSiO2, Carb biog and TOC
Size:
1056 data points

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