Influence of Titaniferous Phases on Tungsten Mineralizing Processes at the Giant Sisson Brook W-Mo Deposit, New Brunswick, Canada: Mineral-Chemical and Geochronological Assessment

The Sisson Brook deposit is a low-grade, large-tonnage W-Mo deposit with notable Cu located in west-central New Brunswick, Canada, and is one of several W-Mo deposits in New Brunswick associated with fluids sourced from granitic plutons emplaced during the Devonian Acadian Orogeny. The younger Devon...

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Published inMinerals (Basel) Vol. 10; no. 7; p. 637
Main Authors Bustard, Aaron L., Zhang, Wei, Lentz, David R., McFarlane, Christopher R. M.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2020
Subjects
Chalcopyrite
Dating
Devonian
Fluids
Geochronology
Igneous rocks
Ilmenite
Lead isotopes
Magma
Mapping
Metamorphism
Mineral reserves
Mineralization
Minerals
Molybdenite
New Brunswick
Ordovician
Orogeny
Phases
Plutons
Quartz
Radiometric dating
Rock
Rocks
Saturation
Scheelite
Silurian
Sisson Brook
Titanite
Titanium
Tungsten
Volcanoes
W-Mo deposit
Wolframite
Lake George
Canada
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Summary:The Sisson Brook deposit is a low-grade, large-tonnage W-Mo deposit with notable Cu located in west-central New Brunswick, Canada, and is one of several W-Mo deposits in New Brunswick associated with fluids sourced from granitic plutons emplaced during the Devonian Acadian Orogeny. The younger Devonian-aged stockwork and replacement scheelite-wolframite-molybdenite (and chalcopyrite) mineralization straddles the faulted boundary between Cambro-Ordovician metasedimentary rocks with Ordovician felsic volcaniclastic rocks and the Middle Silurian Howard Peak Granodiorite, with dioritic and gabbroic phases. U-Pb dating of magmatic titanite in the host dioritic phase of the Howard Peak Granodiorite using LA ICP-MS resulted in a 204Pb-corrected concordant age of 432.1 ± 1.9 Ma. Petrologic examination of selected mineralization combined with elemental mapping of vein selvages using micro-XRF and metasomatic titanite and ilmenite grains using LA ICP-MS indicates that saturation of titaniferous phases influenced the distribution of scheelite versus wolframite mineralization by altering the aFe/aCa ratio in mineralizing fluids. Ilmenite saturation in Ti-rich host rocks lowered the relative aFe/aCa and led to the formation of scheelite over wolframite. Altered magmatic titanite and hydrothermal titanite also show increased W and Mo concentrations due to interaction with and/or saturation from mineralizing fluids.
ISSN:2075-163X
2075-163X
DOI:10.3390/min10070637