Fission track dating of volcanic glasses and the thermal history of rocks HISTORY OF ROCKS D. S`t ORZER Max-Planck-Institut für Kernphysik, Heidelberg. 7hat is why the usual count ing procedure had to be changed. . 1 oc -unit= 062 p 5 0 C) 5 10 Diameter of etched tracks [n oc - units] toc - unit ., 0 62 v Fig. 4.
breccias and associated alteration zones resulting from the exsolution of . A single Ar-Ar age of 14.8 Ma for a pluton previously dated by K-Ar as 11.3 Ma .. Fur- thermore, the isotopic composition of the. Andean magmas associated with these .. Chile, v. 27, p. 3—26. Damon, P. E., 1986, Batholith-volcano coupling in the.
4 Jul 2011 Allen V T. 1929. K/Ar systematics of bentonite and shale in a contact metamorphic zone, Cerrillos, New Mexico. Rb-Sr and U-Pb dating of bentonites. . Altered volcanic ash partings in Wasatch Formation coal beds of the northern .. Mitteilungen Abteilung Fur Geologie Pal¯ontologie Und Bergbau Am
depleted than the alteration zone and rhyolite dike (ISr = 0.7051 and eNd(T) = А1.3 to А1.9). Decoupling . usage of terminology for dike rocks in Huayu by far, e.g., dacite vs. granodiorite (our These three particular samples are fur- ther determined for . LA-ICPMS U–Pb zircon dating results of Huayu volcanics. Grain no.