geochronometry

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geochronometry

[¦jē·ō·krə′näm·ə·trē]
(geology)
The study of the absolute age of the rocks of the earth based on the radioactive decay of isotopes, such as 238U,235U,232Th,87Rb,40K, and 14C, present in minerals and rocks.
References in periodicals archive ?
Yet, apart from the sequence from Little Llangothlin Lagoon itself (Gale and Pisanu 2001), we are not aware of any high-resolution record of the palynology of the early contact period from anywhere in Australia (Gale 2003:12-13): no other record has yet been published in which the point of European contact has been unequivocally established using geochronometric means.
The first high-temperature geochronometric data are presented for the peraluminous, multiple phase Musquodoboit Batholith, the second largest intrusion in the Meguma terrane of Nova Scotia.
gt;500[degrees]C) geochronometric data for the Musquodoboit Batholith (MB, MacDonald and Clarke 1985; Fig.
Although all geochronometric dates involve uncertainties, these are not sufficient in this case to justify placing the date of official European contact much lower in the sequence than its present position, and certainly not as low as the start of the chemical changes under consideration here.