The Rb-Sr isochron
age of the beresite from the Dongfeng gold deposit in this study is 125.5 [+ or -] 6.7 Ma.
methodology and abundant data are reported, for example, by Dalrymple,(9) who cites more than 250 measurements of terrestrial, lunar, and meteoric rocks with excellent concordance.
The Re-Os isochron
calculated by ISOPLOT  is shown in Fig.
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 reported an Rb-Sr whole-rock-mineral isochron
age of 281 [+ or -] 8 Ma for the metagabbro and metabasalt of BABB origin in the Ibara area.
Several lines of evidence indicate that the stratigraphically lower part of the Lesser Himalayan series in Nepal, the Nawakot unit, reached peak metamorphic conditions prior to the Cenozoic:(1) We used a three point Sm/Nd isochron
to date crystallization of a single garnet from the Benighat Formation in the uppermost Lesser Himalayan thrust sheet exposed in the Modi river valley of central Nepal.
The Gowganda Formation has yielded a whole rock Rb/Sr isochron
age of 2288 [+ or -] 87 Ma (Fairbairn et al.
A Review of Dating Methods--Part Two: Radiometric Dating: Mineral, Isochron
and Concordia Methods," 59:1, 28, M 2007.
Within the context of Kirchhoff migration, this stretch is associated to the variation in the curvature of isochron
surfaces for different times on an input seismic trace (Figure 1).
is the curve that includes all of the possible locations in the plane that would cause the measured TDOA (with the signal traveling at the speed of light).
[Pb.sup.207]/[Pb.sup.204] VS [Pb.sup.206]/[Pb.sup.204] plots define a secondary isochron
which, by extrapolation, passes through the Central Metasedimentary Belt data field, suggesting these rocks may have contributed lead to the system.