Unknown
PANGAEA
In:
Supplement to: Bailey, Ian; Liu, Qingsong; Swann, George E A; Jiang, Zhaoxia; Sun, Youbin; Zhao, Xiang; Roberts, Andrew P (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
Publication Date:
2024-01-09
Description:
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.
Keywords:
145-882; 145-882A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg145; North Pacific Ocean; Ocean Drilling Program; ODP
Type:
Dataset
Format:
application/zip, 2 datasets
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