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Ages by the helium method: II Post-Keweenawan
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1936
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History Of ScienceAstrochronologyOrbital VelocityGsa Bulletin 1936Nuclear AstrophysicsHelium Method
Research Article| August 31, 1936 Ages by the helium method: II Post-Keweenawan WILLIAM D. URRY WILLIAM D. URRY Search for other works by this author on: GSW Google Scholar GSA Bulletin (1936) 47 (8): 1217–1234. https://doi.org/10.1130/GSAB-47-1217 Article history received: 26 May 1936 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation WILLIAM D. URRY; Ages by the helium method: II Post-Keweenawan. GSA Bulletin 1936;; 47 (8): 1217–1234. doi: https://doi.org/10.1130/GSAB-47-1217 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract INTRODUCTIONIn Part I of this series,1 the validity of the application of the helium method to the determination of geologic time expressed in years was discussed from the analyses of a suite of Keweenawan basalts. The year was defined as the present period of the earth’s revolution around the sun, although, of course, variation of its orbital velocity may have been appreciable over geologic intervals.2 The geologic age was defined as the number of years since the beginning of accumulation of the stable end-products of the radioactive series. The parent elements of these series are present to the extent of at least a few atoms per billion in all rocks, and a determination of the amount of either of the stable end-products, lead or helium, and of the parent elements present, provides all the data necessary for computing the length of time of accumulation. It was shown, however, that . . . This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.