asthenosphere

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  • noun

Words related to asthenosphere

the lower layer of the crust

References in periodicals archive ?
Subsequent upwelling of the asthenospheric mantle then induced widespread partial melting of the lower crust under 'garnet-present' conditions to generate the 'I-type' Jimmy Hill, Magaguadavic, and 'S-type' Tower Hill plutons (Fig.
The thinning of the lithospheric mantle yields a "void" space at the bottom of the lithosphere to be occupied by relatively low-density asthenospheric material (i.
The first stage initiates as the asthenospheric material rising through the conduit widens it, pushing the orogenic thickened crust and lithospheric root to the left.
Never before have scientists found kimberlite rocks bearing telltale marks of asthenospheric pressures, although some finds may have originated at such depths.
1996) argued that Silurian-Devonian granites in New Brunswick were likely derived by bulk assimilation of Mesoproterozoic Ganderian basement and Gander zone supracrustal rocks by an enriched asthenospheric melt.
2002) as attenuation and rifting of the continental lithosphere connected with asthenospheric mantle upwelling.
Mylonitic texture is observed in the basal peridotite whereas going upward asthenospheric microstructures predominate.
5 Ma (Pardo et al, 2005) is also a possible consequence of the slab tear mechanism, with the nascent tear providing a path for ascending asthenospheric material.
Defant and Kepezhinskas (2001) propose that slab melting and adakite production can also occur near tears in the subducted slab, which also facilitates asthenospheric upwelling.
The tensional regime allowed an intense and volumetric magmatism due to an easier conection to the asthenospheric mantle.
It is associated to the intracontinental rifting of the western margin of the Neotethys, over an asthenospheric mantle source (Lago et al.
It was proposed that localized asthenospheric melting resulted in relatively depleted melts, which were substantially contaminated by fusible lithospheric mantle en route to the surface; and that re-melting of local basaltic rocks by short circuiting of a ruptured high-tension electrical cable was unlikely.
Many mantle melts can be influenced by contamination from the crust and hence may display some chemical characteristics of volcanic-arc rocks without being associated temporally with the partial melting of a subducted slab; however, it is most likely that arc-type chemical signatures observed in volcanic and plutonic rocks in the study area arise from contamination of the asthenospheric source by previous subduction events.
According to Collins (2002), extension and decompression associated with roll-back may result in asthenospheric upwelling and voluminous magmatism in the overlying mantle and crust.