The Rb-Sr
isochron age of the beresite from the Dongfeng gold deposit in this study is 125.5 [+ or -] 6.7 Ma.
The
isochron 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 [16] is shown in Fig.
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[37] 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.
Likewise these data can be plotted on
isochron plots that give added information as to the initial argon concentration of the sample at the time of cooling.
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).
The
isochron 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.
