High closure temperatures of the U-Pb system in large apatites from the Tin Mountain pegmatite, Black Hills, South Dakota, USA

Details High closure temperatures of the U-Pb system in large apatites from the Tin Mountain pegmatite, Black Hills, South Dakota, USA High closure temperatures of the U-Pb system in large apatites from the Tin Mountain pegmatite, Black Hills, South Dakota, USA

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3845k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 18, pp.3845-3853

Computer Science

11

Scientific paper

The cores of several large (1-2 cm) apatites from the Early Proterozoic Tin Mountain pegmatite, Black Hills, South Dakota, have concordant U-Pb ages. The age uncertainties of these samples are less than 5 Ma. The lead isotopic compositions of muscovite and K-feldspar coexisting with the apatites were used for initial lead isotopic corrections. The resulting U-Pb concordia ages agree well with U-Pb and Pb-Pb isochron ages, based solely on multiple fragments from single apatites. This agreement justifies the use of coexisting muscovite and K-feldspar for initial lead corrections. The precision of these U-Pb ages is comparable to those of the U-Pb systems of more commonly analyzed minerals such as zircon, monazite, and sphene. The estimated U-Pb closure temperature ( T c ) of these apatites is about 620°C. This T c is in close agreement with the T c calculated for 0.5 cm diffusion radii and published data for diffusivity and activation energy of lead diffusion in apatite. Apatite can therefore yield high precision U-Pb ages that are close to its crystallization age in igneous rocks.

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