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 …
Continent-sized anomalous zones with low seismic velocity at the base of Earth's mantle
Seismic images of Earth's interior reveal two massive anomalous zones at the base of the
mantle, above the core, where seismic waves travel slowly. The mantle materials that …
mantle, above the core, where seismic waves travel slowly. The mantle materials that …
A review of large low shear velocity provinces and ultra low velocity zones
AK McNamara - Tectonophysics, 2019 - Elsevier
Seismic tomography reveals 2 extensive regions in the lowermost mantle, beneath Africa
and the Pacific, that exhibit lower-than-average seismic wave speeds. These regions have …
and the Pacific, that exhibit lower-than-average seismic wave speeds. These regions have …
Teleseismic imaging of the mantle beneath southernmost China: New insights into the Hainan plume
Intraplate volcanism during the Late Cenozoic in the Leiqiong area of southernmost China,
with basaltic lava flows covering a total of more than 7000 km 2, has been attributed to an …
with basaltic lava flows covering a total of more than 7000 km 2, has been attributed to an …
Supercontinent cycles and the calculation of absolute palaeolongitude in deep time
RN Mitchell, TM Kilian, DAD Evans - Nature, 2012 - nature.com
Traditional models of the supercontinent cycle predict that the next supercontinent—'Amasia'—
will form either where Pangaea rifted (the 'introversion'model) or on the opposite side of the …
will form either where Pangaea rifted (the 'introversion'model) or on the opposite side of the …
Chemical complexity of hotspots caused by cycling oceanic crust through mantle reservoirs
Lavas erupted at ocean island hotspots such as Hawaii have diverse geochemical
signatures. These ocean island basalts are thought to be derived from many sources with …
signatures. These ocean island basalts are thought to be derived from many sources with …
Primordial helium entrained by the hottest mantle plumes
MG Jackson, JG Konter, TW Becker - Nature, 2017 - nature.com
Helium isotopes provide an important tool for tracing early-Earth, primordial reservoirs that
have survived in the planet's interior,,. Volcanic hotspot lavas, like those erupted at Hawaii …
have survived in the planet's interior,,. Volcanic hotspot lavas, like those erupted at Hawaii …
An unsually large ULVZ at the base of the mantle near Hawaii
S Cottaar, B Romanowicz - Earth and Planetary Science Letters, 2012 - Elsevier
Previous studies have documented the presence of ultra-low-velocity-zones (ULVZs) at the
base of the mantle, through observations of body wave complexities. Geometrically their …
base of the mantle, through observations of body wave complexities. Geometrically their …
Chemical geodynamics insights from a machine learning approach
The radiogenic isotope heterogeneity of oceanic basalts is often assessed using 2D isotope
ratio diagrams. But because the underlying data are at least six dimensional (87Sr/86Sr …
ratio diagrams. But because the underlying data are at least six dimensional (87Sr/86Sr …
The primitive nature of large low shear-wave velocity provinces
The lowermost (> 2400km) Earth's mantle mapped by seismic tomography is strongly
heterogeneous, the most striking feature being two large regions where shear-wave velocity …
heterogeneous, the most striking feature being two large regions where shear-wave velocity …