00000nam 2200000zi 4500 9.953456 CaOODSP 20250722110324 m o d f cr mn||||||||| 250722t19991999oncab ob f001 0 eng d 0660177471 (print) CaOODSP eng rda CaOODSP eng eng fre n-cn--- M44-1999/6E-PDF M44-1999/6E Radiogenic age and isotopic studies : report 12. [Ottawa] : Natural Resources Canada = Ressources naturelles Canada, 1999. ©1999 1 online resource (65 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Geological Survey of Canada current research ; 1999-F Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references and index. A practical image analysis technique for estimating the weight of abraded mineral fractions used in U-Pb age dating / W. Matthews and W.J. Davis -- Rapid extraction of Sr and Pb by ion-specific chromatography for thermal ionization mass spectrometry analysis / R.J. Theriault and W.J. Davis -- Characterization of the chemical composition and ⁴⁰Ar-³⁹ Ar systematics of intralaboratory standard MAC-83 biotite / H.A. Sandeman, D.A. Archibald, J.W. Grant, M.E. Villeneuve, and F.D. Ford -- Calibration of a Neogene magnetostratigraphy by ⁴⁰Ar-³⁹ Ar geochronology: the foreland basin strata of northern Mendoza Province, Argentina / M.V. Irigoyen, M.E. Villeneuve, and F. Quigg -- Preliminary geochemical and Nd isotopic investigations of Archean volcanic and volcaniclastic rocks of the Yathkyed greenstone belt, Kivalliq region, Northwest Territories / H.A. Sandeman, K. MacLachlan, and C. Relf -- Geochemical and Sm-Nd isotopic study of Paleoproterozoic basaltic and gabbroic rocks of the Hurwitz Group, Kaminak Lake area, Kivalliq region, Northwest Territories / C.J. Hemmingway and H.A. Sandeman -- Other publications containing age and isotopic data generated in the GSC Geochronology Laboratory. "Radiogenic Age and Isotopic Studies is an annual report on recently obtained radiometric age and tracer isotope data generated by the Geochronology Subdivision at the Geological Survey of Canada. Report 12 consists of six papers on various geoscience research topics within the fields of U-Pb and ⁴⁰Ar-³⁹ Ar geochronology as well as Sm-Nd isotopic tracer studies. Readers are reminded that the contributions often contain provisional results and interpretations of ongoing research, or consist of completed studies of limited scope. Typically, articles of greater depth and magnitude are published in external journals. A list of such recent works as well as other publications that report data from the GSC Geochronology Laboratory is provided at the end of this volume. Two open file geochronogical compilations on Archean rocks of the Canadian Shield are also listed. …"--Introduction. Includes introductions and abstracts in English and French. Radioactive dating Canada. Geological time Canada. Isotope geology Canada. Radioactive dating. Geological time. Isotope geology. Datation radioactive Canada. Géochronologie Canada. Géochimie isotopique Canada. Datation radioactive. Géochronologie. Géochimie isotopique. Geological Survey of Canada, issuing body. Radiogenic age and isotopic studies: report 12 (CaOODSP)9.614772 Current research (Geological Survey of Canada) 1999-F. (CaOODSP)9.506236 PDF 16.40 MB https://publications.gc.ca/collections/collection_2025/rncan-nrcan/M44-1999-6-eng.pdf