Browsing ELibrary by Subject "U/PB"

Now showing items 1-4 of 4

CONTRASTED MONAZITE HYDROTHERMAL ALTERATION MECHANISMS AND THEIR GEOCHEMICAL IMPLICATIONS

Poitrasson F.; Chenery S.R.; Bland D.J. (1996)

In spite of the major importance of monazite as a repository for the rare earths and Th in the continental crust, for U-Th-Pb geochronology, and as a possible form for high-level nuclear waste, very little work has been ...
CRYSTAL ORIENTATION EFFECTS DURING ION MICROPROBE U-PB ANALYSIS OF BADDELEYITE

Wingate M.T.D.; Compston W. (2000)

We show that 206Pb/238U ratios measured in baddeleyite by ion microprobe vary significantly (up to +/-10% or more) and systematically with the relative orientation of the baddeleyite crystal structure and the primary ion ...
DIRECT ION MICROPROBE U-PB DATING OF FOSSIL TOOTH OF A PERMIAN SHARK

Sano Y.; Terada K. (1999)

We report here direct ion microprobe dating of fossil tooth (dentine) of a Permian fresh-water shark, Orthacanthus senckenbergianus using the SHRIMP instrument recently installed at Hiroshima University. Fifteen spots on ...
INHERITED PB COMPONENTS IN MAGMATIC TITANITE AND THEIR CONSEQUENCE FOR THE INTERPRETATION OF U-PB AGES

Lian-Sheng Z.; Scharer U. (1996)

The occurrence of inherited radiogenic Pb components in 35 Ma old magmatic titanite is reported here for the first time. The about 810 Ma age of the inherited components is identical to that contained in zircon from the ...

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