Browsing ELibrary by Author "O'Connell R.J."

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COMPARISON OF AZIMUTHAL SEISMIC ANISOTROPHY FROM SURFACE WAVES AND FINITE STRAIN FROM GLOBAL MANTLE-CIRCULATION MODELS

Becker T.W.; Kellogg J.B.; Ekström G.; O'Connell R.J. (2003)

We present global models of strain accumulation in mantle flow to compare the predicted finite-strain ellipsoid (FSE) orientations with observed seismic anisotropy. The geographic focus is on oceanic and young continental ...
MODELING THE DISTRIBUTION OF ISOTOPIC RATIOS IN GEOCHEMICAL RESERVOIRS

Kellogg J.B.; Jacobsen S.B.; O'Connell R.J. (2002)

We present an extension of the conventional geochemical reservoir model for the evolution of the Earth's crust-mantle system in which we calculate not only the mean isotopic ratios, but also the distribution of those ratios ...
THERMAL CONSTRAINTS ON THE SURVIVAL OF PRIMITIVE BLOBS IN THE LOWER MANTLE

Becker T.W.; Kellogg J.B.; O'Connell R.J. (1999)

Geochemical models have frequently divided the mantle into depleted upper and undepleted lower mantle reservoirs, usually taken as indication for a layered style of convection. This is difficult to reconcile with seismological ...
THERMAL STRUCTURE, THICKNESS AND COMPOSITION OF CONTINENTAL LITHOSPHERE

Rudnick R.L.; McDonough W.F.; O'Connell R.J. (1998)

Global compilations of surface heat flow data from stable, Precambrian terrains show a statistically significant secular change from 41±11 mW/m2 in Archean to 55±17 mW/m2 in Proterozoic regions far removed from Archean ...

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