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Geological Survey of Canada Commission geologique du Canada RADlOGENlC AGE AND ISOTOPIC STUDIES: REPORT 2 STAFF, GEOCHRONOLOGY SECTION: GEOLOGICAL SURVEY OF CANADA Research Scientists : Otto van Breemen J. Chris Roddick Randall R. Parrish James K. Mortensen Post-Doctoral Fellows : Mary Lou Bevier Francis 0. Dudis Ernst Hegner Professional Scientists : W. Dale Loveridge Robert W. Sullivan Patricia A. Hunt Reginald J. Theriault Technical Staff: Jack L. Macrae Klaus Santowski Jean-Claude Bisson Diane Bellerive Fred B. Quigg Rejean J.G. Seguin Sample crushing and preliminary mineral separation are done by the Mineralogy Section GEOLOGICAL SURVEY OF CANADA PAPER 88-2 ! RADlOGENlC AGE AND ISOTOPIC STUDIES: REPORT 2 1988 Energy, Mines and ~nergie,Mines et Resources Canada Ressources Canada Q Minister of Supply and Services Canada 1988 Available in Canada through authorized bookstore agents and other bookstores or by mail from Canadian Government Publishing Centre Supply and Services Canada Ottawa, Canada KIA OS9 and from Geological Survey of Canada offices : 601 Booth Street Ottawa, Canada KIA OE8 3303-33rd Street N.W., Calgary, Alberta T2L 2A7 100 West Pender Street. Vancouver, B.C. V6B 1R8 A deposit copy of this publication is also available for reference in public libraries across Canada Cat. No. M44-88/2E ISBN 0-660-1 3084-X Prices subjects to change without notice Cover SEM photographs of baddeleyite and zircon-rimmed baddeleyite from coronotic olivine metadia- base, Ontario Grenville Province. Top Left: single baddeleyite crystal (200p long) with typical polysynthetic twinning. Top centre and right: two views of the same grain (400p long) of baddeleyite (light grey core) partly replaced by polycrystalline zircon and retaining baddeleyite crystal habit. Bottom: Stereophoto pair of baddeleyite care (light grey) from which zircon rim (medium grey) has partly peeled away ; faceted projections on surface of baddeleyite, which is a single crystal, are nega- tive zircon crystals formed at the bases of individual columns or replacing zircon (aggregate grain is 29011 long). U-Pb isotope analyses suggest an age difference of 120 Ma between the two Zr phases. Original manuscript received: 08 08 1988 Final version approved for publication: 20 10 1988 CONTENTS Introduction J.K. Mortensen The assessment of errors in 40Arl39Ar dating J.C. Roddick Samarium-neodymium and rare-earth element liquid chromatography (HPLC) techniques at the geochronology laboratory, Geological Survey of Canada R. W. Sullivan The age of the Mount Copeland syenite gneiss and its metamorphic zircons, Monashee Complex, southeastern British Columbia R.R. Parrish and R.J. Scammell Age of the Mount Harper volcanic complex, southern Ogilvie Mountains, Yukon C.F. Roots and R.R. Parrish A U-Pb zircon age for the ophiolitic Deveraux Formation, Elmtree Terrane, northeastern New Brunswick C.R. van Staal, J.P. Langton, and R.W. Sullivan K-Ar ages from the Minden area, Grenville Province, Ontario R.M. Easton and J.C. Roddick U-Pb zircon ages of granites and syenites in the Central Metasedimentary Belt, Grenville Prov- ince, Ontario 0. van Breemen and A. Davidson Two U-Pb zircon ages from eastern Glennie Lake Domain, Trans-Hudson Orogen, Saskatchewan G. Delaney, S.D. Carr, and R.R. Parrish Geochronology of the Taltson Magmatic Zone and its eastern cratonic margin, District of Mackenzie H.H. Bostock and W.D. Loveridge Early Proterozoic U-Pb zircon ages for granitoid rocks from the Moraine Lake transect, Thelon Tectonic Zone, District of Mackenzie D.T. James, 0. van Breemen, and W.D. Loveridge U-Pb zircon and monazite ages from the eastern Slave Province and Thelon Tectonic Zone, Artillery Lake area, N.W.T. 0. van Breemen and J.B. Henderson U-Pb zircon ages for felsic volcanism in Slave Province, N.W.T. J.K. Mortensen, R.I. Thorpe, W.D. Padgham, J.E. King, and W.J. Davis Age constraints on the evolution of the Quetico Belt, Superior Province, Ontario J.A. Percival and R.W. Sullivan Use of zircon U-Pb ages of felsic intrusive and extrusive rocks in eastern Wabigoon Subprovince, Ontario, to place constraints on base metal and gold mineralization C.D. Anglin, J.M. Franklin, W.D. Loveridge, P.A. Hunt, and S.A. Osterberg U-Pb zircon and monazite ages from the Precambrian Shield of Ellesmere and Devon islands, Arctic Archipelago T. Frisch and P.A. Hunt A compilation of K-Ar ages. Report 18 P.A. Hunt and J.C. Roddick OTHER PUBLICATIONS CONTAINING GEOCHRONOLOGY DATA ERRATA Paper 87-2, Radiogenic Age and Isotopic Studies: Report 1 Page 53, Table 1 Change '06Pb = 100 to 206Pb= 1000 Page 53, Table l Change '07Pb/207Pbto 207Pb/206Pb Page 82, Figure 1 Sample 12 on map should be plotted on NE side of Gordon Bay. Page 116, column 1, line 21-22 Should read: "upper and lower intercept ages are 2664 + 3 Ma and ca. 160 Ma." Pages147 and 159 The figures on pages 147 and 159 have been transposed. The captions are correct. INTRODUCTION "Radiogenic Age and Isotopic Studies" is an annual La publication annuelle a Age radiomttrique et Ctudes collection of reports presenting data from the isotopiques >) est une sCrie de rapports prtsentant les Geochronology Section of the Lithosphere and Cana- donnCes produites par la Section de la gtochronologie dian Shield Division. The main purpose of this collec- de la Division de la lithosphbre et du bouclier cana- tion is to make geochronological and other radiogenic dien. Cette sCrie a pour principal objectif de permettre isotope data produced by the Section available aux gkologues d'avoir accbs rapidement aux donntes promptly to the geological community. Reports make gCochronologiques et aux donntes sur les isotopes full presentation of the data, relate these to field formCs par dCcomposition radioactive. Les rapports settings, and make comparatively short interpreta- prCsentent les donnCes dans leur inttgralitt ainsi tions. Readers are cautioned that some data reported qu'une description de la gtologie des lieux et de here are part of work in progress, and more extensive courtes interprktations des donntes. I1 est h signaler publications may follow at a later date. Other que certaines de ces donntes proviennent de travaux geochronological and isotope data produced in the en cours de sorte que des donntes plus exhaustives laboratory but published in outside journals or sepa- seront publites 3 une date ulttrieure. D'autres rate GSC publications are summarized at the end of donnCes gCochronologiques et isotopiques produites this report. dans le laboratoire mais publikes dans des revues scientifiques extCrieures ou dans d'autres publications The first two reports cover advances andlor de la CGG sont rtsumCes 3 la fin du present rapport. reviews of analytical techniques. The past year has seen the establishment of the 40Ar/"Ar and NdISm Les deux premiers rapports traitent des progrb techniques at the Geochronology Section as routine accomplis ou prtsentent une analyse des techniques procedures. Analytical papers presented here include analytiques, ou les deux. Depuis l'an dernier, les tech- a discussion of error propagation analysis as applied niques de datation par les mtthodes 40Ar/39Ar et to 40Ar/39Ar data, and a report of a high perfor- NdISm sont couramment utilistes dans la Section de mance liquid chromatography (HPLC) technique for la gCochronologie. L'un des documents analytiques the extraction and purification of Nd, Sm, and other traite de l'analyse de propagation des erreurs sur les trace elements. Conventional chemical separation rapports 40Ar/39Aret un autre fait etat de la tech- techiques are also employed for Nd isotope tracer nique de chromatographic en phase liquide B haut studies. Results of research now in progress using rendement pour l'extraction et la purification de Nd, these techniques will appear in forthcoming volumes. de Sm et d'autres ClCments en traces. On utilise tgale- ment des techniques classiques de stparation Geochronological support of geological mapping chimique pour 1'Ctude d'indicateurs isotopiques Nd. programs at the GSC can be of immediate economic Les rCsultats des travaux de recherche en cours dans significance, for example by delineating the eastern lesquels ces techniques sont utilistes seront prCsentCs margin of the gold-bearing Slave Province (van dans des volumes ulttrieurs. Breemen and Henderson, this volume and preceding volume). In addition, the Section is playing an L'apport de la gCochronologie aux programmes de increasingly important role in regional metallogenic cartographie gtologique 3 la CGC peut revstir une and specific mineral deposit studies. Examples of importance tconomique immtdiate, notamment pour research now in progress include placing constraints dClimiter la bordure est de la provice aurifere des on the age of formation of stratiform base metal and Esclaves (van Breemen et Henderson, le prCsent iron-formation hosted gold mineralization in the Slave volume). De plus, la section joue un r61e grandissant and Superior provinces (see for example Mortensen dans la rCalisation dlCtudes mttallogtniques et al., this volume) and on the age of epigenetic gold regionales et d'analyses de certains gisements mineralization in the Superior Province (e.g. Anglin midraux. Parmi les travaux de recherche en cours, et al., this volume). Much of the K-Ar dating carried on remarque celui sur la limitation de l'dge de mise out by the Section is done as part of mineral deposit en place d'une minkralisation aurifere dans une research. Direct dating of epigenetic mineralization formation stratiforme de mCtaux de base et de fer dans using a variety of techniques (e.g. U-Pb on rutile and les provinces des Esclaves et du lac SupCrieur (voir 40Ar/39Aron muscovite) is underway on samples par exemple Mortensen et coll., le present volume) et from Newfoundland and Yukon Territory. Pb isotope 1'8ge d'une mineralisation aurifere CpigCnCtique dans analysis of sulphides using conventional mass spec- la province du lac SupCrieur (par exemple, Anglin et trometer techniques is also undertaken as part of many coll., le prCsent volume).