When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean... more When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean ridge can display anomalously shallow bathymetry, excess volcanism, thickened crust, asymmetric sea-floor spreading and a plume component in the composition of the ridge basalts. The hotspot-related volcanism can be drawn closer to the ridge, and its geochemical composition can also be affected. Here we present Sr-Nd-Pb isotopic analyses of samples from the next-to-oldest seamount in the Hawaiian hotspot track, the Detroit seamount at 51 degrees N, which show that, 81 Myr ago, the Hawaiian hotspot produced volcanism with an isotopic signature indistinguishable from mid-ocean ridge basalt. This composition is unprecedented in the known volcanism from the Hawaiian hotspot, but is consistent with the interpretation from plate reconstructions that the hotspot was located close to a mid-ocean ridge about 80 Myr ago. As the rising mantle plume encountered the hot, low-viscosity asthenosphere ...
The island of Tahiti, the largest in French Polynesia, comprises of two major volcanoes aligned N... more The island of Tahiti, the largest in French Polynesia, comprises of two major volcanoes aligned NW-SE, parallel with the general trend of the Society Islands hotspot track. Rocks from this volcanic system are basalts transitional to tholeiites, alkali basalts, basanites, picrites, and evolved lavas. Through K-Ar radiometric dating we have established the age of volcanic activity. There is a clear
... 79, 477-483, 1980. 2 AW Hofmann and WM White, Mantle plumes from ancient oceanic crust, Earth... more ... 79, 477-483, 1980. 2 AW Hofmann and WM White, Mantle plumes from ancient oceanic crust, Earth Planet. Sci. Lett. ... A 306, 49-59, 1982. 11 RK O'Nions, NM Evensen and PJ Hamilton, Geochemical modeling of mantle differentiation and crustal growth, J. Geophys. Res. ...
The Geochemical Earth Reference Model (GERM) initiative is a grass- roots effort with the goal of... more The Geochemical Earth Reference Model (GERM) initiative is a grass- roots effort with the goal of establishing a community consensus on a chemical characterization of the Earth, its major reservoirs, and the fluxes between them. Long term goal of GERM is a chemical reservoir characterization analogous to the geophysical effort of the Preliminary Reference Earth Model (PREM). Chemical fluxes between
When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean... more When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean ridge can display anomalously shallow bathymetry, excess volcanism, thickened crust, asymmetric sea-floor spreading and a plume component in the composition of the ridge basalts. The hotspot-related volcanism can be drawn closer to the ridge, and its geochemical composition can also be affected. Here we present Sr-Nd-Pb isotopic analyses of samples from the next-to-oldest seamount in the Hawaiian hotspot track, the Detroit seamount at 51 degrees N, which show that, 81 Myr ago, the Hawaiian hotspot produced volcanism with an isotopic signature indistinguishable from mid-ocean ridge basalt. This composition is unprecedented in the known volcanism from the Hawaiian hotspot, but is consistent with the interpretation from plate reconstructions that the hotspot was located close to a mid-ocean ridge about 80 Myr ago. As the rising mantle plume encountered the hot, low-viscosity asthenosphere ...
The island of Tahiti, the largest in French Polynesia, comprises of two major volcanoes aligned N... more The island of Tahiti, the largest in French Polynesia, comprises of two major volcanoes aligned NW-SE, parallel with the general trend of the Society Islands hotspot track. Rocks from this volcanic system are basalts transitional to tholeiites, alkali basalts, basanites, picrites, and evolved lavas. Through K-Ar radiometric dating we have established the age of volcanic activity. There is a clear
... 79, 477-483, 1980. 2 AW Hofmann and WM White, Mantle plumes from ancient oceanic crust, Earth... more ... 79, 477-483, 1980. 2 AW Hofmann and WM White, Mantle plumes from ancient oceanic crust, Earth Planet. Sci. Lett. ... A 306, 49-59, 1982. 11 RK O'Nions, NM Evensen and PJ Hamilton, Geochemical modeling of mantle differentiation and crustal growth, J. Geophys. Res. ...
The Geochemical Earth Reference Model (GERM) initiative is a grass- roots effort with the goal of... more The Geochemical Earth Reference Model (GERM) initiative is a grass- roots effort with the goal of establishing a community consensus on a chemical characterization of the Earth, its major reservoirs, and the fluxes between them. Long term goal of GERM is a chemical reservoir characterization analogous to the geophysical effort of the Preliminary Reference Earth Model (PREM). Chemical fluxes between
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