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TitlePreliminary geological and petrographic study of the Poplar Mountain Au occurrence, southwestern New Brunswick
AuthorChi, G; Watters, S E
SourceGeological Survey of Canada, Current Research (Online) no. 2002-D6, 2002, 11 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
ProvinceNew Brunswick
AreaYork; Poplar Mountain; 9
Lat/Long WENS-67.5000 -67.0000 46.2500 46.0000
Subjects2; stratigraphy; economic geology; igneous and metamorphic petrology; petrography; gold; mineral occurrences; volcanic rocks; igneous rocks; dacites; basalts; volcaniclastics; sericite; veins; breccias; alteration; dacite porphyries; porphyry deposits; structural features; mineralization; hydrothermal alteration; Poplar Mountain Volcanic Complex; Ordovician; Cambrian; Paleozoic
Illustrationssketch maps; photographs; stereonets
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 03 08
AbstractThe Poplar Mountain Volcanic Complex consists of three principal volcanic and subvolcanic units in the Poplar Mountain area, i.e. porphyritic dacite, dacitic volcaniclastic rocks, and basaltic volcanic rocks. The porphyritic dacite is a subvolcanic intrusion located in the centre of a volcanic dome and is sur-rounded by dacitic volcaniclastic rocks. The basaltic unit is stratigraphically above the felsic units. Gold mineralization is mainly associated with arsenopyrite, and to a lesser extent with pyrite and stibnite. The sulphides are disseminated in the dacite, and in various quartz-carbonate-sericite veins and quartz-cemented breccia. The mineralized zones are characterized by a higher degree of fracturing and veining than the barren zones, and are closely related to phyllic (sericite+carbonate+quartz+illite) alteration. Propyllitic (chlorite+carbonate+illite) alteration is widespread, and is mainly preserved in nonmineralized zones. The mineralization and alteration share some analogies with low-sulphidation epithermal deposits, or the outer zone of a porphyry-type system.