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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A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrons.
Our data from various layers of Bilong Co oil shale do not define isochrons.
Nevertheless, our data from various layer oil shale do not define isochrons, which is true of the Belong Co oil shale, and also of the Shenglihe oil shale.
they fail to explain why there are so many cases where there is good concordance of isochrons .
use stable isotope data to demonstrate the importance of evaluating chemical and isotopic equilibrium in the interpretation of isotopic mineral isochrons.
The overall expansion northwestwards from a near eastern origin is maintained, although the isochrons are less regularly spaced suggesting a much greater variance in the rate of spread of early farmers into the different areas of Europe.
Rb/Sr isochrons of Precambrian age from plutonic rocks in the Cobequid Highlands, Nova Scotia.
In November 1997 the Geographical Journal, published by the Royal Geographical Society (with IBG), carried a feature assessing the pros and cons of these claims, along with weighty assessments of sunrise isochrons, declinations and complex equations to pinpoint the place where the sun first peeps over the horizon.
Yet they fail to explain why there are so many cases where there is good concordance of isochrons, something which would never happen if radioisotopic dating were not valid.
This method provides a way of circumventing the interpretative difficulties associated with radiocarbon dating at palaeoenvironmental (natural) and archaeological sites because tephra layers provide virtually instantaneous chronostratigraphic marker horizons, or isochrons, that can be correlated between sites independently of radiometric dating.
Internal or mineral isochrons are constructed from isotopic analyses of individual minerals that have been extracted from a single large rock sample.
In principle, the denser and more precise the information is, the finer the chronological slice forming the isochrons will be.