Browsing by Author "van Keken P.E."
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Browsing by Author "van Keken P.E."
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van Keken P.E.; Ballentine C.J.; Porcelli D. (2001)The terrestrial heat-helium imbalance [O'Nions and Oxburgh, Nature 306 (1983) 429-431] is based on the observation that significantly less 4He is released from the Earth's mantle than is predicted from the radiogenic element ...
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McNamara A.K.; Karato S.I.; van Keken P.E. (2001)Recent seismological observations reveal the presence of seismic anisotropy in localized regions at the base of the mantle within an otherwise isotropic lower mantle. These regions can be placed in a tectonic context, ...
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van Keken P.E.; Hauri E.H.; Ballentine C.J. (2002)Observations of the geochemical diversity of mid-oceanic ridge and ocean-island basalts have traditionally been attributed to the existence of large-scale mantle heterogeneity. In particular, the layered convection model ...
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Zegers T.E.; van Keken P.E. (2001)The processes that created the first large cratonic areas such as the Pilbara and the Kaapvaal remain poorly understood. Models based on the uniformitarian extrapolation of present-day arc volcanic processes to a hotter ...
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van den Berg A.P.; Yuen D.A.; van Keken P.E. (1995)Numerical simulations of mantle convection with a composite temperature-dependent, Newtonian and non-Newtonian creep law have revealed a transition in the dominant creep mechanism with the increasing vigour of convection. ...
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van Keken P.E. (2003)A large amount of water is brought into the Earth’s mantle at subduction zones. Upon subduction, water is released from the subducting slab in a series of metamorphic reactions. The resulting flux into the mantle wedge ...
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van Keken P.E.; Ballentine C.J. (1998)Terrestrial noble gas isotope geochemistry provides one of the most powerful geochemical tools presently available for understanding the volatile evolution of the Earth. The data require the existence of isolated reservoirs ...
Now showing items 1-7 of 7