Bailey, Ian; Liu, Qingsong; Swann, George E A; Jiang, Zhaoxia; Sun, Youbin; Zhao, Xiang; Roberts, Andrew P (2011): Pliocene sediment and silicon isotope record of ODP Site 145-882 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.772036, Supplement to: Bailey, I et al. (2011): Iron fertilisation and biogeochemical cycles in the sub-Arctic northwest Pacific during the late Pliocene intensification of northern hemisphere glaciation. Earth and Planetary Science Letters, 307(3-4), 253-265, https://doi.org/10.1016/j.epsl.2011.05.029
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Abstract:
Increases in the low-field mass-specific magnetic susceptibility (chi), dropstones and the terrigenous sediment component from Ocean Drilling Program (ODP) Site 882 (~45°N) have been interpreted to indicate a major onset of ice-rafting to the sub-Arctic northwest Pacific Ocean during marine isotope stage (MIS) G6 (from ~2.75 Ma). In contrast, studies of the terrigenous content of sediments cored downwind of ODP Site 882 indicate that dust and disseminated volcanic ash deposition in the sub-Arctic Pacific increased markedly during MIS G6. To investigate the relative contribution of dust, volcanic ash and ice rafting to the Pliocene chi increase, we present new high-resolution environmental magnetic and ice-rafted debris records from ODP Sites 882 and 885. Our results demonstrate that the chi increase at both sites across MIS G6 is predominantly controlled by a previously overlooked mixture of aeolian dust and volcanic ash. Our findings call into question the reliability of chi as a proxy for ice-rafting to the North Pacific. They also highlight a previously undocumented link between iron fertilisation and biogeochemical cycling in the North Pacific at a key stage during intensification of late Pliocene northern hemisphere glaciation.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 50.363300 * Median Longitude: 167.599900 * South-bound Latitude: 50.363300 * West-bound Longitude: 167.599800 * North-bound Latitude: 50.363300 * East-bound Longitude: 167.600000
Date/Time Start: 1992-07-08T10:30:00 * Date/Time End: 1992-08-08T00:00:00
Event(s):
145-882 * Latitude: 50.363300 * Longitude: 167.599800 * Date/Time Start: 1992-08-05T00:00:00 * Date/Time End: 1992-08-08T00:00:00 * Elevation: -3255.0 m * Penetration: 668.7 m * Recovery: 692.1 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 71 cores; 668.7 m cored; 0 m drilled; 103.5% recovery
145-882A * Latitude: 50.363300 * Longitude: 167.600000 * Date/Time Start: 1992-08-05T17:45:00 * Date/Time End: 1992-07-08T10:30:00 * Elevation: -3255.0 m * Penetration: 398.3 m * Recovery: 411.2 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 398.3 m cored; 0 m drilled; 103.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Bailey, I; Liu, Q; Swann, GEA et al. (2011): Silicon isotope ratios of diatoms from ODP Site 145-882. https://doi.org/10.1594/PANGAEA.772035
- Bailey, I; Liu, Q; Swann, GEA et al. (2011): Lithic and volcanic grain distribution in ODP Hole 145-882A. https://doi.org/10.1594/PANGAEA.772033