Results 41 to 50 of about 4,719 (167)
Depth-dependent peridotite-melt interaction and the origin of variable silica in the cratonic mantle
Nature Communications, 2021 The compositional variability amongst Archaean cratonic peridotites has long been recognized, however its origin remains debated. The authors here find that the collapse of the dual Archaean mantle melting environment ceased production of silica-enriched
Emma L. Tomlinson, Balz S. Kamber
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Metallic melt for the mantle [PDF]
Science, 2016 Geophysics Ultralow velocity zones (ULVZs) are distinct and dense patches at the very base of Earth's rocky mantle. Liu et al. suggest that iron carbide may be a vital component of ULVZs on the basis of measurements of iron carbide melting temperatures.
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melting of the Siberian Mantle Plume [PDF]
Geophysical Research Letters, 1998 The Putorana basalts, comprising ∼90% of the Siberian Traps (ST), have had their chemistry modified from primary tholeiitic picritic magmas by ∼12% crystallization of olivine. Major‐trace element ratios, and Nd isotopes of these lavas are consistent with their origin from a relatively undepleted plume by 12–16% rapid decompressional melting at ∼50–80 ...
Asish R. Basu +2 more
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Геодинамика и тектонофизика, 2017 A comprehensive model for deep dynamics in Asia has been developed from the data on the evolution of melting anomalies in the context of lithospheric plate motions, interactions, orogeny, and rifting.
I. S. Chuvashova +2 more
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Global-scale modelling of melting and isotopic evolution of Earth's mantle: melting modules for TERRA [PDF]
Geoscientific Model Development, 2016 Many outstanding problems in solid-Earth science relate to the geodynamical explanation of geochemical observations. Currently, extensive geochemical databases of surface observations exist, but satisfying explanations of underlying mantle processes are ...
H. J. van Heck +3 more
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Deglaciation-enhanced mantle CO2 fluxes at Yellowstone imply positive climate feedback
Nature CommunicationsMantle melt generation in response to glacial unloading has been linked to enhanced magmatic volatile release in Iceland and global eruptive records. It is unclear whether this process is important in systems lacking evidence of enhanced eruptions.
Fiona Clerc +2 more
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Scientific Reports, 2021 Two-thirds of the Earth is covered by mid-ocean ridge basalts, which form along a network of divergent plate margins. Basalts along these margins display a chemical diversity, which is consequent to a complex interplay of partial mantle melting in the ...
Marianne Richter +4 more
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The constant oxidation state of Earth’s mantle since the Hadean
Nature CommunicationsDetermining the evolutionary history of mantle oxygen fugacity (fo2) is crucial, as it controls the fo2 of mantle-derived melts and regulates atmospheric composition through volcanic outgassing. However, the evolution of mantle fo2 remains controversial.
Fangyi Zhang +6 more
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Granite magmatism and mantle filiation [PDF]
European Journal of MineralogyCurrent granite magma generation models essentially reduce to two groups: (1) intra-crustal melting and (2) basaltic origin. A mixed, crustal, and basaltic origin and therefore a mantle filiation has been proposed for most granite magma types.
M. Pichavant +3 more
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Geochemical Constraints on the Structure of the Earth's Deep Mantle and the Origin of the LLSVPs
Geochemistry, Geophysics, Geosystems, 2021 Geophysical analysis of the Earth's lower mantle has revealed the presence of two superstructures characterized by low shear wave velocities on the core‐mantle boundary.
Matthew Gleeson +4 more
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