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Article: Glacial isostatic adjustment and the free air gravity anomaly as a constraint on deep mantle viscosity.

TitleGlacial isostatic adjustment and the free air gravity anomaly as a constraint on deep mantle viscosity.
Authors
Issue Date1983
Citation
Geophysical Journal - Royal Astronomical Society, 1983, v. 74 n. 2, p. 377-449 How to Cite?
AbstractA gravitationally self-consistent theory for relative sea-level variations forced by Pleistocene deglaciation events is employed to explore the extent to which RSL and free air gravity observations together constrain the viscosity of the mantle beneath the seismic discontinuity at 670 km depth. A trade-off is revealed between errors in the assumed deglaciation history and errors in the inferred value of the viscosity of the lower mantle. Taking full account of such uncertainty, plausible values of the viscosity beneath the transition region are bounded above by 1023 poise (cgs units). The preferred value is at least a factor of 2 lower than this and is strongly constrained by the observed free air gravity anomaly over Hudson Bay. The calculations described in detail here show for the first time that the relatively large gravity anomalies observed over sites of Würm- Wisconsin deglaciation do not require any pronounced increase of mantle viscosity with depth in order to explain them.
Persistent Identifierhttp://hdl.handle.net/10722/192112
ISSN
2015 Impact Factor: 2.484
2015 SCImago Journal Rankings: 1.839

 

DC FieldValueLanguage
dc.contributor.authorWu, Pen_US
dc.contributor.authorPeltier, WRen_US
dc.date.accessioned2013-10-23T09:26:00Z-
dc.date.available2013-10-23T09:26:00Z-
dc.date.issued1983en_US
dc.identifier.citationGeophysical Journal - Royal Astronomical Society, 1983, v. 74 n. 2, p. 377-449en_US
dc.identifier.issn0956-540X-
dc.identifier.urihttp://hdl.handle.net/10722/192112-
dc.description.abstractA gravitationally self-consistent theory for relative sea-level variations forced by Pleistocene deglaciation events is employed to explore the extent to which RSL and free air gravity observations together constrain the viscosity of the mantle beneath the seismic discontinuity at 670 km depth. A trade-off is revealed between errors in the assumed deglaciation history and errors in the inferred value of the viscosity of the lower mantle. Taking full account of such uncertainty, plausible values of the viscosity beneath the transition region are bounded above by 1023 poise (cgs units). The preferred value is at least a factor of 2 lower than this and is strongly constrained by the observed free air gravity anomaly over Hudson Bay. The calculations described in detail here show for the first time that the relatively large gravity anomalies observed over sites of Würm- Wisconsin deglaciation do not require any pronounced increase of mantle viscosity with depth in order to explain them.-
dc.languageengen_US
dc.relation.ispartofGeophysical Journal - Royal Astronomical Societyen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleGlacial isostatic adjustment and the free air gravity anomaly as a constraint on deep mantle viscosity.en_US
dc.typeArticleen_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1111/j.1365-246X.1983.tb01884.x-
dc.identifier.scopuseid_2-s2.0-0021058066en_US
dc.identifier.volume74en_US
dc.identifier.issue2en_US
dc.identifier.spage377en_US
dc.identifier.epage449en_US

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