isochron


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isochron

(ˈaɪsəʊˌkrɒn)
n
1. (Geological Science) a line on an isotope ratio diagram denoting a suite of rock or mineral samples all formed at the same time. The slope of the line is related to the age of the rock or mineral suite
2. (Geological Science) a line or curve on a geological map or cross section (esp of oceanic crust) connecting points of identical age
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References in periodicals archive ?
The isochron from the demand point is drawn by using ArcGIS space analysis technology based on the walking time and concept of isochron.
A molybdenite Re-Os isochron age of 206.4 [+ or -] 3.9 Ma [22] suggests that molybdenum mineralization occurred in the Late Triassic.
A minimum age of emplacement for the Tower Hill Granite is given by an Rb-Sr muscovite isochron date of 401 [+ or -] 4 Ma (Whalen et al.
The isochron age was calculated with the ISOPLOT program (Ludwing, 1998).
In the present study, we use KOT as a time marker, or isochron, to quantify long-term soil erosion by comparing differences in KOT depth and concentration between the study plots.
Using zircon sensitive high-resolution ion microprobe (SHRIMP) U-Pb and monazite chemical Th-U-total Pb isochron methods (CHIME) presumably regional metamorphic event occurred between 187 [+ or -] 2.6 Ma and 180 [+ or -] 21 Ma, respectively.
4b, Table 4) very homogeneous for steps B-J in 56-57 Ma., and it is possible to plot an isochron line with B to F data yielding an age of 55.8 [+ or -] 0.29 Ma (Fig.
(1992): "Uranium-series Isochron Dating at El Castillo Cave (Cantabria, Spain): The Acheulean/Mousterian question", Journal of Archaeological Science, vol.
(1974) [Ar.sup.40]/[K.sup.40] isochron age for amphibolites of the ophiolitic complexes of the Appalachians of Quebec.
Balco, G., and Rovey, C.W., II, 2008, An isochron method for cosmogenic nuclide dating of buried soils and sediments: American Journal of Science, v.
Such a scenario would explain the very low strontium isotope values, high strontium concentrations, low Sr/Ca, and also the Rb-Sr isochron (Douglas et al.
We believe the rate of helium diffusion from zircons, the presence of polonium radiohalos near uranium radiohalos in granite, the discordance of isochron dates among multiple conventional dating methods, and the presence of measurable concentrations of carbon-14 in coal and diamonds as explicated in our book provide strong evidence for a young earth.