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Mantle plumes and their role in Earth processes
The existence of mantle plumes was first proposed in the 1970s to explain intra-plate,
hotspot volcanism, yet owing to difficulties in resolving mantle upwellings with geophysical …
hotspot volcanism, yet owing to difficulties in resolving mantle upwellings with geophysical …
Earth's mantle composition revealed by mantle plumes
Mantle plumes originate at depths near the core− mantle boundary (~ 2,800 km). As such,
they provide invaluable information about the composition of the deep mantle and insight …
they provide invaluable information about the composition of the deep mantle and insight …
[HTML][HTML] Subduction zone geochemistry
Crustal recycling at convergent plate boundaries is essential to mantle heterogeneity.
However, crustal signatures in the mantle source of basaltic rocks above subduction zones …
However, crustal signatures in the mantle source of basaltic rocks above subduction zones …
[HTML][HTML] Stagnant lids and mantle overturns: Implications for Archaean tectonics, magmagenesis, crustal growth, mantle evolution, and the start of plate tectonics
JH Bédard - Geoscience Frontiers, 2018 - Elsevier
The lower plate is the dominant agent in modern convergent margins characterized by
active subduction, as negatively buoyant oceanic lithosphere sinks into the asthenosphere …
active subduction, as negatively buoyant oceanic lithosphere sinks into the asthenosphere …
The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system
We report analyses of the 176Hf 177Hf ratio for 25 chondrites from different classes of
meteorites (C, O, and E) and the 176Lu 177Hf ratio for 23 of these as measured by plasma …
meteorites (C, O, and E) and the 176Lu 177Hf ratio for 23 of these as measured by plasma …
Mantle geochemistry: the message from oceanic volcanism
Basaltic volcanism'samples' the Earth's mantle to great depths, because solid-state
convection transports deep material into the (shallow) melting region. The isotopic and trace …
convection transports deep material into the (shallow) melting region. The isotopic and trace …
Earth's heterogeneous mantle: A product of convection-driven interaction between crust and mantle
A Stracke - Chemical Geology, 2012 - Elsevier
Ubiquitous heterogeneity in the Earth's mantle has been documented by numerous
chemical and isotopic analyses of oceanic basalts. Despite the ever-increasing amount of …
chemical and isotopic analyses of oceanic basalts. Despite the ever-increasing amount of …
Significance of Nb/Ta as an indicator of geochemical processes in the crust-mantle system
A mantle value of∼ 17.5 for Nb/Ta appears well established; less well established are
crustal values of∼ 11–12, although it appears that Nb/Ta for crustal-derived melts is less …
crustal values of∼ 11–12, although it appears that Nb/Ta for crustal-derived melts is less …
Alkaline-silicate REE-HFSE systems
Abstract Development of renewable energy infrastructure requires critical raw materials,
such as the rare earth elements (REEs, including scandium) and niobium, and is driving …
such as the rare earth elements (REEs, including scandium) and niobium, and is driving …
Relationships between Lu–Hf and Sm–Nd isotopic systems in the global sedimentary system
We report new Hf (and Nd) data for more than 100 sedimentary samples, recent to Archean
in age, from a wide range of depositional environments. These data document the behavior …
in age, from a wide range of depositional environments. These data document the behavior …