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K[40] - Ar[40] isotopic age determination of the Nelson batholith, B.C.

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dc.contributor.author Nguyeh, Kim-Khanh
dc.date.accessioned 2011-06-29T17:19:18Z
dc.date.available 2011-06-29T17:19:18Z
dc.date.copyright 1968
dc.date.issued 40723
dc.identifier.uri http://hdl.handle.net/2429/35805
dc.description.abstract 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. en
dc.language.iso eng en
dc.publisher University of British Columbia en
dc.relation.ispartof Retrospective Theses and Dissertations, 1919-2007 en
dc.relation.ispartofseries UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] en
dc.subject Potassium-argon dating en
dc.title K[40] - Ar[40] isotopic age determination of the Nelson batholith, B.C. en
dc.type Text en
dc.degree.name Master of Applied Science - MASc en
dc.degree.discipline Geophysics en
dc.degree.grantor University of British Columbia en
dc.type.text Thesis/Dissertation en
dc.description.affiliation Science, Faculty of en
dc.degree.campus UBCV en
dc.description.scholarlevel Graduate en

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