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TitleIntegrated analyses of density, P-wave velocity, lithogeochemistry, and mineralogy to investigate effects of hydrothermal alteration and metamorphism on seismic reflectivity: a summary of results from the Lalor volcanogenic massive-sulfide deposit, Snow Lake, Manitoba
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSchetselaar, E MORCID logo; Bellefleur, GORCID logo; Hunt, P
SourceTargeted Geoscience Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods; by Peter, J MORCID logo (ed.); Gadd, M GORCID logo (ed.); Geological Survey of Canada, Bulletin 617, 2022 p. 329-344, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods
RelatedThis publication is related to Elucidating the effects of hydrothermal alteration on seismic reflectivity in the footwall of the Lalor volcanogenic massive sulfide deposit, Snow Lake, Manitoba, Canada
File formatpdf
AreaSnow Lake
Lat/Long WENS-100.1833 -100.1000 54.9000 54.8500
Subjectseconomic geology; geophysics; mineralogy; geochemistry; Science and Technology; Nature and Environment; mineral exploration; mineral deposits; volcanogenic deposits; sulphide deposits; hydrothermal systems; hydrothermal alteration; metamorphism; geophysical surveys; seismic reflection surveys; seismic waves; p waves; seismic velocities; geophysical logging; density logging; wireline logs; seismic interpretations; host rocks; bedrock geology; structural features; faults; lithology; igneous rocks; volcanic rocks; volcaniclastics; felsic volcanic rocks; mafic volcanic rocks; lithofacies; metamorphic facies; amphibolite facies; greenschist facies; lithogeochemistry; mineralogical analyses; statistical analyses; mineral assemblages; cordierite; amphibole; garnet; x-ray emission spectroscopy; scanning electron microscope analyses; modelling; core samples; Lalor Deposit; Chisel Basin; Snow Lake Domain; Paleoproterozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; cross-sections; tables; plots; photomicrographs; bar graphs; models; seismic profiles
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems - volcanogenic massive sulphide ore systems
Released2022 01 27; 2022 11 17
AbstractWe present herein a summary of integrated data analyses aimed at investigating the effects of hydrothermal alteration on seismic reflectivity in the footwall of the Lalor volcanogenic massive-sulfide (VMS) deposit, Manitoba. Multivariate analyses of seismic rock properties, lithofacies, and hydrothermal alteration indices show an increase in P-wave velocity for altered volcanic and volcaniclastic lithofacies with respect to their least-altered equivalents. Scanning electron microscopy-energy dispersive X-ray spectrometry analyses of drill-core samples suggest that this P-wave velocity increase is due to the high abundance of high P-wave velocity aluminous minerals, including cordierite, Fe-Mg amphibole, and garnet, which in volcanic rocks are characteristic of VMS-associated hydrothermal alteration metamorphosed in the amphibolite facies. A seismic synthetic profile computed from a simple amphibolite-facies mineral assemblage model, consisting of mafic-felsic host rock contacts, a sulfide ore lens, and a discordant hydrothermal conduit, show enhanced seismic reflections at conduit-host rock contacts in comparison to the equivalent greenschist facies mineral assemblage model. Collectively our results suggest that VMS footwall hydrothermal alteration zones metamorphosed under middle- to upper-amphibolite facies conditions have enhanced potential for seismic detection.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This contribution summarizes the results of a 5-year study of multiple mineral deposit types: polymetallic hyper-enriched black shale; sedimentary exhalative Pb-Zn; carbonate-hosted Pb-Zn, magnesite; fracture-controlled replacement Zn-Pb, rare-earth element-F-Ba; and volcanogenic massive sulfides. Studies employed field geology, combined with geochemical (lithogeochemistry, stable and radiogenic isotopes, fluid inclusions, and mineral chemistry) and geophysical (rock properties, magnetotelluric, and seismic) methods. Collectively, the research provides advanced genetic and exploration models for volcanic- and sedimentary-hosted base-metal deposits, together with new laboratory, geophysical, and field techniques.

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