GEOSCAN Search Results: Fastlink


TitlePreliminary geochemical results on mantle metal mobility
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLawley, C J MORCID logo; Kjarsgaard, B AORCID logo; Zagorevski, AORCID logo; Pearson, G; Waterton, P; Savard, D; Jackson, S EORCID logo; Yang, Z; Zhang, S; Tschirhart, VORCID logo
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 127-131, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
ProvinceBritish Columbia; Ontario
NTS32D; 32E; 104J; 104K; 104N; 104O
AreaAtlin; Kirkland Lake
Lat/Long WENS-134.0000 -130.0000 60.0000 58.0000
Lat/Long WENS -80.0000 -80.0000 48.5000 48.0000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; mineralogy; mineral deposits; mineral potential; mineral exploration; ore controls; ore mineral genesis; gold; nickel; copper; base metals; mantle; ophiolites; kimberlites; inclusions; host rocks; source rocks; isotopic studies; lead isotope ratios; clinopyroxene; olivine; electron probe analyses; mass spectrometer analysis; scanning electron microscope analyses; spectroscopic analyses; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; tonalites; ultramafic rocks; Canadian Cordillera; Cache Creek Terrane; Canadian Shield; Superior Province; Abitibi Subprovince; Kirkland Lake Kimberlite Field; Blake River Group; Tisdale Group; Kidd-munro Assemblage; Phanerozoic; Mesozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Gold systems
Released2018 01 19
AbstractProcesses operating within mantle source regions likely impact the fertility of ore-bearing melts, although the precise link between mantle conditioning and ore genesis remain poorly understood. New fieldwork and isotopic (Re-Os and Pb-Pb) results for ultramafic samples from young (Mesozoic), ophiolitic mantle near Atlin British Columbia, document ancient (i.e. Paleoproterozoic and younger), refractory mantle domains hosted within variably depleted harzburgite. The metal endowment of these distinct mantle segments and the microscale distribution of gold, platinum group elements and base metals are the focus of on-going study.
Field-based research at Atlin complements chemical analysis of kimberlite-hosted mantle olivine and clinopyroxene xenocrysts. These mantle fragments provide a snapshot of the ancient, sub-continental lithospheric mantle beneath the Neoarchean Abitibi sub-province (Kirkland Lake kimberlite field). Geochemical depth profiles, based on preliminary in situ geochemical results of the least-altered xenocrysts, suggest that high temperature olivine is a significant silicate mineral host for some of the so-called chalcophile elements at depth (e.g. Cu and Zn). Other metals, including a rare subset of xenocrysts that yield concentrations for gold and platinum at or above the analytical detection limit (1-5 ppb), occur as micro-inclusions. The distribution of metal-bearing mineral phases within the mantle and, the micro-scale setting of metals within those phases (e.g. mineral inclusions versus lattice substitution), may control the variable metallic endowment of mantle-derived melts in ancient and modern settings.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

Date modified: