Thesis (M.S.)--Ohio State University. / Includes bibliographical references (leaves 60-62). Available online via OhioLINK's ETD Center

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Typescript. / Thesis (Ph. D.)--University of Hawaii, 1963. / Bibliography: leaves 107-113. / viii, 114 l illus., diagrs., tables

The purposes of this thesis are to examine ages of the Nelson batholith and its satellites because of the wide range of biotite model ages previously published in the literature, and to test hornblende and pyroxene further for their application in K⁴⁰ - Ar⁴⁰ dating as reliable minerals. K⁴⁰ - Ar⁴⁰ model ages obtained on biotite, hornblende and clinopyroxene from the present study indicate with certainty that the various phases of the Nelson batholith were emplaced during a short span of time, centered around 156 m.y. corresponding to the Upper-Middle Jurassic boundary of the Kulp’s time scale. At least a period of hydrothermal alteration has occurred in this area since that time. It is evident that these phases cannot be distinguished on the basis of their K⁴⁰ - Ar⁴⁰ model ages. It is also evident that hornblende gives reliable model ages. Clinopyroxene contains significant excess of radiogenic argon and should not be used for K⁴⁰ - Ar⁴⁰ dating. Biotite may occasionally contain excess of radiogenic argon, particularly under high temperature and high argon pressure environmental conditions. Analytical techniques used and descriptions of the samples analyzed are given as appendixes. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

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Potassium-argon apparent ages obtained on biotite and amphibole from various phases of the Guichon Creek batholith present on the Bethlehem Copper property are reported and their geological significances are discussed in this thesis. Although the individual phases were found to be essentially indistinguishable in terms of their potassium-argon apparent ages, the results obtained indicated with considerable certainty that these phases were emplaced during an interval not greater than 10 m.y. centered around 200 m.y. ago and that no major metamorphic event has occurred in this area since this time. It is also believed that this average apparent age of 200 m.y. may represent a better approximation to the maximum age of the Triassic-Jurassic boundary than that previously reported in the literature. The potassium and argon analytical techniques employed are described briefly, and the analytical precision and accuracy obtained are discussed. Descriptions of the samples collected and samples analyzed are given as an appendix. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

Thesis--Yale University. / Includes bibliographical references (leaves 191-196).

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Typescript. / Thesis (Ph. D.)--University of Hawaii, 1966. / Bibliography: leaves 156-168. / xiii, 168 l illus. (part mounted), tables

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