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Iron fertilisation and biogeochemical cycles in the sub-Arctic northwest Pacific during the late Pliocene intensification of northern hemisphere glaciation

Iron fertilisation and biogeochemical cycles in the sub-Arctic northwest Pacific during the late Pliocene intensification of northern hemisphere glaciation
Iron fertilisation and biogeochemical cycles in the sub-Arctic northwest Pacific during the late Pliocene intensification of northern hemisphere glaciation
Increases in the low-field mass-specific magnetic susceptibility (?), 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 ? increase, we present new high-resolution environmental magnetic and ice-rafted debris records from ODP sites 882 and 885. Our results demonstrate that the ? 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 ? as a proxy for ice-rafting to the North Pacific. They also highlight a previously undocumented link between iron fertilization and biogeochemical cycling in the North Pacific at a key stage during intensification of late Pliocene northern hemisphere glaciation.
aeolian dust, volcanic glass, ice rafted debris, North Pacific, nutrient use, northern hemisphere glaciation
0012-821X
253-265
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Liu, Qingsong
fbaf8851-e943-4ece-91f5-c5f30306dff1
Swann, George E.A.
b4d954da-8ae0-49e8-b777-babfdb4344cc
Jiang, Zhaozia
d71bfb3b-bbe3-44c1-9d8a-1fe4d19908a3
Sun, Youbin
b97d1e17-ffc2-433c-b7b1-00dfe820e634
Zhao, Xiang
99ee573a-4607-40b5-a473-2046d623a2e0
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Liu, Qingsong
fbaf8851-e943-4ece-91f5-c5f30306dff1
Swann, George E.A.
b4d954da-8ae0-49e8-b777-babfdb4344cc
Jiang, Zhaozia
d71bfb3b-bbe3-44c1-9d8a-1fe4d19908a3
Sun, Youbin
b97d1e17-ffc2-433c-b7b1-00dfe820e634
Zhao, Xiang
99ee573a-4607-40b5-a473-2046d623a2e0
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f

Bailey, Ian, Liu, Qingsong, Swann, George E.A., Jiang, Zhaozia, Sun, Youbin, Zhao, Xiang and 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.

Record type: Article

Abstract

Increases in the low-field mass-specific magnetic susceptibility (?), 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 ? increase, we present new high-resolution environmental magnetic and ice-rafted debris records from ODP sites 882 and 885. Our results demonstrate that the ? 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 ? as a proxy for ice-rafting to the North Pacific. They also highlight a previously undocumented link between iron fertilization and biogeochemical cycling in the North Pacific at a key stage during intensification of late Pliocene northern hemisphere glaciation.

Full text not available from this repository.

More information

Published date: 15 July 2011
Keywords: aeolian dust, volcanic glass, ice rafted debris, North Pacific, nutrient use, northern hemisphere glaciation

Identifiers

Local EPrints ID: 187715
URI: https://eprints.soton.ac.uk/id/eprint/187715
ISSN: 0012-821X
PURE UUID: 8fb23bc3-075f-40be-b24b-47ad39d9c9a7

Catalogue record

Date deposited: 20 May 2011 13:16
Last modified: 04 Nov 2017 10:15

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