Results 21 to 30 of about 27,280 (282)

Mantle Flow Drives the Subsidence of Oceanic Plates [PDF]

Science, 2010
Sinking Sea Floors The depths of ocean bottoms are constantly fluctuating at a very slow rate in response to the generation (at mid-ocean ridges) and consumption (at subduction zones) of sea-floor material. Because older sea floor is susceptible to sinking as it cools, it has been assumed that sea-floor depth varies directly with
Adam, Claudia, Vidal, Valérie
openaire   +3 more sources

Channelized melt flow in downwelling mantle: Implications for 226Ra-210Pb disequilibria in arc magmas [PDF]

, 2008
We present the results of an analytical model of porous flow of viscous melt into a steadily dilating ‘‘channel’’ (defined as a cluster of smaller veins) in downwelling subarc mantle.
Koenders, M. A., Petford, Nick; id_orcid, Koenders, M.A., Petford, N., Turner, S, Petford, Nick, Turner, S., Koenders, M A   +7 more
core   +1 more source

Modification of the lithospheric stress field by lateral variations in plate-mantle coupling [PDF]

, 2009
The presence of deeply penetrating continental roots may locally increase the magnitude of basal shear tractions by up to a factor of 4 compared to a layered viscosity structure.
Naliboff, JB, Naliboff, J. B., Conrad, CP, Conrad, C. P., Lithgow-Bertelloni, C, Lithgow‐bertelloni, C.   +5 more
core   +1 more source

Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation [PDF]

, 2014
We report a first application of an improved second-order (SO) viscoplastic self-consistent model for multiphase aggregates, applied to an olivine + diopside aggregate as analogue for a dry upper mantle peridotite deformed at 10 15 s 1 shear strain rate ...
CORDIER, Patrick, CASTELNAU, Olivier, RATERON, Paul, MERKEL, Sébastien, RATERRON, Paul, BOLLINGER, Caroline, DETREZ, Fabrice   +6 more
core   +1 more source

Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites [PDF]

, 2006
Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e.
Lesher, C. M., P. D. Asimow (4380079), Niu, Yaoling, A. D. Saunders (7585886), Lesher, C.M., Arndt, N., Herzberg, C., C. Herzberg (10061344), Fitton, J.G., Fitton, J. G., Asimow, Paul D., Y. L. Niu (10061347), C. M. Lesher (7733825), Asimow, P.D., J. G. Fitton (7585871), Saunders, A.D., Saunders, A. D., Arndt, Nicholas, N. Arndt (8870258), Michael Cheadle (10060309), Cheadle, M. J., Cheadle, M.J., Niu, Y. L., Niu, Y., Asimow, P. D., Cheadle, Michael   +25 more
core   +1 more source

Upper Mantle Anisotropy and Flow Beneath the Pacific Ocean Revealed by Differential PS‐SKS Splitting

Geophysical Research Letters, 2023
Upper mantle anisotropy has been mapped beneath continents at high spatial resolution. Beneath the oceans, however, shear wave splitting constraints on upper mantle anisotropy are sparse, due to the paucity of seismic receivers. A technique that does not
Jonathan Wolf, Maureen D. Long
doaj   +1 more source

Noble gases confirm plume-related mantle degassing beneath Southern Africa

Nature Communications, 2019
Southern Africa is characterised by unusually elevated topography and abnormal heat flow. This can be explained by thermal perturbation of the mantle, but the origin of this is unclear.
S. M. V. Gilfillan, D. Györe, S. Flude, G. Johnson, C. E. Bond, N. Hicks, R. Lister, D. G. Jones, Y. Kremer, R. S. Haszeldine, F. M. Stuart   +10 more
doaj   +1 more source

Sr-Nd-Pb-Hf isotope results from ODP Leg 187: Evidence for mantle dynamics of the Australian-Antarctic Discordance and origin of the Indian MORB source [PDF]

, 2002
New high precision PIMMS Hf and Pb isotope data for 14–28 Ma basalts recovered during ODP Leg 187 are compared with zero-age dredge samples from the Australian-Antarctic Discordance (AAD).
Barry, Tiffany Louise, Langmuir, C., Christie, D. M., David M. Christie, Barry, T. L., Pearce, J. A., Pamela D. Kempton, Pearce, Julian A., J. Godfrey Fitton, Tiffany L. Barry, Charles Langmuir, Langmuir, Charles, Julian A. Pearce, Kempton, Pamela D., Fitton, J. G., Kempton, P. D., Fitton, J. Godfrey, Christie, David M.   +17 more
core   +1 more source

Seismic Anisotropy and Mantle Flow in the Sumatra Subduction Zone Constrained by Shear Wave Splitting and Receiver Function Analyses

Geochemistry, Geophysics, Geosystems, 2020
To systematically investigate seismic azimuthal anisotropy in the Sumatra subduction zone and probe mantle dynamics associated with the subduction of the Australian Plate beneath the Sunda Plate, a total of 169 pairs of teleseismic XKS (including PKS ...
Fansheng Kong, Stephen S. Gao, Kelly H. Liu, Jie Zhang, Jiabiao Li   +4 more
doaj   +1 more source

Depth-varying azimuthal anisotropy and mantle flow in the Patagonian slab window

Seismica
Subduction of spreading ridges forms slab windows which perturb the local structure and dynamics of the upper mantle. Slab windows may alter the pattern of mantle flow and serve as portals for the exchange of mantle material between upper mantle ...
Hannah Mark, Douglas Wiens, Walid Ben Mansour, Zhengyang Zhou   +3 more
doaj   +1 more source