Browsing by Subject "U-238/TH-230"

Now showing items 1-4 of 4

INVESTIGATING SOLID MANTLE UPWELLING RATES BENEATH MID-OCEAN RIDGES USING U-SERIES DISEQUILIBRIA, 1: A GLOBAL APPROACH

Lundstrom C.C.; Williams Q.; Gill J.B. (1998)

U-series disequilibria in MORB produce trends of (230Th)/(232Th) as a function of (238U)/(232Th) for given lengths of ridge often defined by first-order segmentation. These trends are most easily explained as mixing between ...
PB ISOTOPE COMPOSITIONS OF MODERN DEEP SEA TURBIDITES

Hemming S.R.; McLennan S.M. (2001)

Modern deep sea turbidite muds and sands collected from Lamont piston cores represent a large range in age of detrital sources as well as a spectrum of tectonic settings. Pb isotope compositions of all but three of the 66 ...
U-SERIES DISEQUILIBRIA GENERATED BY PARTIAL MELTING OF SPINEL LHERZOLITE

Landwehr D.; Blundy J.; Chamorro-Perez E.M.; Hill E.; Wood B. (2001)

We have experimentally investigated the effects of crystal chemistry on the partitioning of U and Th between clinopyroxene and anhydrous silicate melt in a wide range of synthetic systems from 1 to 8 GPa and 1330 to 1735°C. ...
URANIUM AND THORIUM DIFFUSION IN DIOPSIDE

Van Orman J.A.; Grove T.L.; Shimizu N. (1998)

This paper presents new experimental data on the tracer diffusion rates of U and Th in diopside at 1 atm and 1150-1300°C. Diffusion couples were prepared by depositing a thin layer of U-Th oxide onto the polished surface ...

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