Fluid migration in the mantle wedge: Influence of mineral grain size and mantle compaction
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Geophysical Research"
DOI: 10.1002/2017jb014046
Abstract: Mineral grain size in the mantle affects fluid migration by controlling mantle permeability; the smaller the grain size, the less permeable the mantle is. Mantle shear viscosity also affects fluid migration by controlling compaction pressure;… read more here.
Keywords: mantle wedge; fluid migration; mantle; grain size ... See more keywords
Fabric heterogeneity in the Mojave lower crust and lithospheric mantle in southern California
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Geophysical Research"
DOI: 10.1002/2017jb014280
Abstract: We use xenoliths from young cinder cones in the eastern Mojave region of southern California to investigate deformation fabrics and their implications for strain localization, lithospheric viscosity, and controls on mineral lattice preferred orientations (LPO)… read more here.
Keywords: southern california; mantle; california; lower crustal ... See more keywords
Seismic anisotropy and mantle dynamics beneath the Malawi Rift Zone, East Africa†
Sign Up to like & getrecommendations! Published in 2017 at "Tectonics"
DOI: 10.1002/2017tc004519
Abstract: SKS, SKKS, and PKS splitting parameters measured at 34 seismic stations that we deployed in the vicinity of the Cenozoic Malawi Rift Zone (MRZ) of the East African Rift System demonstrate systematic spatial variations with… read more here.
Keywords: rift zone; mantle; rift; seismic anisotropy ... See more keywords
Early Cenozoic Denudation of Central West Britain in Response to Transient and Permanent Uplift Above a Mantle Plume
Sign Up to like & getrecommendations! Published in 2018 at "Tectonics"
DOI: 10.1002/2017tc004796
Abstract: Upwelling mantle plumes beneath continental crust are predicted to produce difficult to quantify, modest uplift and denudation. The contribution of permanent and transient components to the uplift is also difficult to distinguish. A pulse of… read more here.
Keywords: mantle; mantle plume; west britain; central west ... See more keywords
Geochemical characteristics of the La Réunion mantle plume source inferred from olivine-hosted melt inclusions from the adventive cones of Piton de la Fournaise volcano (La Réunion Island)
Sign Up to like & getrecommendations! Published in 2017 at "Contributions to Mineralogy and Petrology"
DOI: 10.1007/s00410-017-1397-2
Abstract: Major and trace element compositions were obtained for bulk rocks and melt inclusions hosted in olivine crystals (Fo > 85) from the adventive cones of the Piton de La Fournaise volcano (La Réunion Island). Ratios of highly… read more here.
Keywords: adventive cones; mantle; melt inclusions; trace ... See more keywords
High Ni and low Mn/Fe in olivine phenocrysts of the Karoo meimechites do not reflect pyroxenitic mantle sources
Sign Up to like & getrecommendations! Published in 2017 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2017.08.002
Abstract: Abstract Nickel contents and Mn/Fe in olivine phenocrysts have been suggested to reflect the mineral composition of the mantle source of the host magma. This hypothesis is tested here against a well-characterized suite of meimechitic… read more here.
Keywords: mantle; low olivine; high low; phenocrysts karoo ... See more keywords
Helium incorporation and diffusion in polycrystalline olivine
Sign Up to like & getrecommendations! Published in 2018 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2018.04.013
Abstract: Helium is a key tracer of mantle geochemical and isotopic heterogeneities and can constrain our understanding of mantle geodynamics. Nevertheless, the mechanisms of helium storage and transport in mantle minerals remain poorly understood. Polycrystalline olivine… read more here.
Keywords: mantle; diffusion; polycrystalline olivine; grain boundaries ... See more keywords
Diamondiferous lamproites of the Luangwa Rift in central Africa and links to remobilized cratonic lithosphere
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2020.120019
Abstract: Abstract Mesozoic diamondiferous lamproite pipes occur along the Kapamba River within the Luangwa Valley of eastern Zambia, which is a ca. 300–200 Ma old Karoo-age precursor branch to the East African Rift System. The Luangwa Rift… read more here.
Keywords: luangwa rift; mantle; central africa; kapamba ... See more keywords
Seismic evidence for Earth's crusty deep mantle
Sign Up to like & getrecommendations! Published in 2017 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2017.04.036
Abstract: Abstract Seismic tomography resolves anomalies interpreted as oceanic lithosphere subducted deep into Earth's lower mantle. However, the fate of the compositionally distinct oceanic crust that is part of the lithosphere is poorly constrained but provides… read more here.
Keywords: mantle; deep mantle; heterogeneity; deep earth ... See more keywords
The importance of mantle wedge heterogeneity to subduction zone magmatism and the origin of EM1
Sign Up to like & getrecommendations! Published in 2017 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2017.04.051
Abstract: The composition of the convecting asthenospheric mantle that feeds the mantle wedge can be investigated via rear-arc lavas that have minimal slab influence. This "ambient mantle wedge" composition (the composition of the wedge prior to… read more here.
Keywords: wedge heterogeneity; mantle; wedge; 143 144 ... See more keywords
Asthenospheric kimberlites: Volatile contents and bulk compositions at 7 GPa
Sign Up to like & getrecommendations! Published in 2017 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2017.06.037
Abstract: Abstract During ascent, kimberlites react with the lithospheric mantle, entrain and assimilate xenolithic material, loose volatiles and suffer from syn- and post-magmatic alteration. Consequently, kimberlite rocks deviate heavily from their primary melt. Experiments at 7… read more here.
Keywords: contents bulk; bulk compositions; volatile contents; mantle ... See more keywords