Regional geology, structure, and mineral deposits of the Archean Swayze Greenstone Belt, southern Superior Province, Ontario

Heather, K B

doi:10.4095/134257

Cited by 4 publications

(11 citation statements)

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“…1) is the westernmost extension of the mineral-rich Abitibi greenstone belt (AGB), and has recently been re-mapped by both the OGS (Ayer 1995 a, b), and the GSC (Heather & Shore 1999). Like the AGB, the SGB contains a number of foldrepeated 2730-2680 Ma mafic-felsic metavolcanic packages, which are unconformably overlain by Timiskaming-type metasedimentary rocks and cut by high strain zones thought to be extensions of the major breaks (Destor-Porcupine and Cadillac-Larder Lake faults) found in the AGB (Ayer & Theriault 1993;Heather 1993;Heather & van Breeman 1994;Heather et al 1995Heather et al , 1996. These high strain zones are the hosts of several large Au deposits in the Timmins and Kirkland Lake areas.…”

Section: Study Areamentioning

confidence: 99%

Analysis of geochemical data for mineral exploration using a GIS — A case study from the Swayze greenstone belt, northern Ontario, Canada

Harris

Wilkinson

Bernier³

2001

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Geographic Information Systems (GIS) provide the geologist with a powerful tool, when used in concert with statistical and geostatistical analysis, for archiving, manipulating, analysing and visualizing geochemical data. This paper uses geochemical (Zn, Cu) data obtained from various media (rock, lake sediments, till, soil and humus) over the Swayze greenstone belt in northern Ontario, to explore methods for analysing and visualizing geochemical data with a focus to mineral exploration applications.The behaviour of Zn and Cu in both bedrock and the surficial environment is studied using statistical and geostatistical techniques. Interpretation and uses of traditional statistics and dot plots are contrasted with interpolated geochemical maps as well as red-green-blue (RGB) ternary maps. Techniques for multimedia comparison and geochemical anomaly detection and screening are presented. The processing methods presented in this paper can be utilized and adapted by other geologists for exploring their own geochemical data. Many of the algorithms presented here are available within standard GIS software packages, or can be written easily using a GIS macro language. Base metals, Ag, As, Co Ba, Mo, V, Mn Majors, base metals, Cr, Li, Ba, Co, Nb, Mo, V Hg % calcite, % dolomite, % total carbonate Gold grains; kimberlite indicator minerals; total ferromagnetic and non-ferromagnetic heavy mineral abundance * INAA, Instrumental neutron activation analysis; ICP-ES, Inductively coupled plasma emission spectrometry; AR, aqua regia; HF, Hydrofluoric acid; CV-AAS, Cold vapour atomic absorption spectrometry.Fig. 3. Location of lake sediment samples.

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Section: Study Areamentioning

confidence: 99%

Analysis of geochemical data for mineral exploration using a GIS — A case study from the Swayze greenstone belt, northern Ontario, Canada

Harris

Wilkinson

Bernier³

2001

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Section: R a F Tmentioning

confidence: 99%

“…of ductile shearing with later brittle faulting (Heather 2001;van Breemen et al 2006;Berger 2011). Previous studies suggested the RDZ is the western extension of the gold-rich Larder Lake-Cadillac deformation zone (Heather 2001;van Breemen et al 2006). It has been argued that although of similar age, it is unlikely that these two deformation zones are correlative based on different kinematic histories and their location along different parts of the regional stratigraphy (Berger 2011).…”

Section: R a F Tmentioning

confidence: 99%

“…Metamorphic grade ranges from sub-greenschist to greenschist grade but locally higher amphibolite grade conditions were attained next to large synvolcanic and syntectonic intrusions (Heather 2001;van Breemen et al 2006). The peak of metamorphism in the southern AGB is estimated to have occurred from 2677 to 2643 Ma (Powell et al 1995).…”

Section: R a F Tmentioning

confidence: 99%

“…Based on the current understanding of the study area, the CIC has been tilted moderately to steeply north from its original orientation. The CIC contains numerous rafts, screens and inclusions of the Arbutus (Heather 2001) and Yeo Formations (Berger 2012;Fig. 3).…”

Section: R a F Tmentioning

confidence: 99%

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The geology, petrology, and geochronology of the Archean Côté Gold large-tonnage, low-grade intrusion-related Au(–Cu) deposit, Swayze greenstone belt, Ontario, Canada

et al. 2017

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The Archean Côté Gold Au(-Cu) deposit is the first large gold deposit discovered in the Swayze greenstone belt of the Abitibi Subprovince. The deposit is a low-grade, large-tonnage type with a combined indicated and inferred resource of 8.65 M oz Au. The deposit is hosted by the Chester intrusive complex (CIC), a multi-phase, subvolcanic intrusion comprised of low-Al tonalite, diorite and quartz diorite, plus magmatic and hydrothermal breccia bodies. The age of the tonalite and dioritic phases is constrained at 2741 to 2739 ± 1 Ma using high-precision ID-TIMS U-Pb zircon geochronology. Although these phases are co-temporal and co-spatial, they appear to be petrogenetically unrelated. The CIC was emplaced into mafic metavolcanic rocks of the Arbutus Formation whose geochemistry reflects a back-arc environment. The tonalite of the CIC is coeval and co-genetic with the felsic to intermediate metavolcanic rocks of the Yeo Formation. Emplacement of the CIC into a shallow crustal level is inferred based on the incorporation of screens and inclusions of the Yeo Formation and is supported by the presence of textures in tonalite and dioritic rocks (e.g., granophyres, miarolitic cavities and pegmatites), as well as Al-in-hornblende geobarometry results of ≤1.3 ± 0.6 kbars. The CIC is petrologically similar to other subvolcanic, low-Al tonalite-trondhjemite-diorite intrusions that underlie VMStype deposits and which themselves may contain syn-intrusion mineralization. Several geochemically unrelated dykes and deformation events crosscut and postdate the CIC. Most of these Archean plutonic rocks belong to the high-Al tonalite-trondhjemite-granodiorite (TTG) suite, whereas the low-Al tonalite-trondhjemite-diorite (TTD) suites are subordinate (Martin et al. 2005). Low-Al TTD suites have been documented to form small, composite synvolcanic intrusions in rift environments that underlie and are considered the heat and/or metal source for spatially related VMS mineralization (Campbell et al. 1981; Cathles 1981; Franklin 1996; Barrie et al. 1999; Galley et al. 2000; Galley 2003; Yergeau et al. 2015). The low-Al composite intrusions are compositionally equivalent to FII and FIII-type rhyolites, and as such, are prospective for base metal mineralization (Lesher et al. 1986). Some of these intrusions have been documented to host Cu-Mo(-Au) mineralization with a porphyry-type affinity (Friske 1974 The Côté Gold deposit represents a significant new discovery (2009/2010 Rogers et al. 2013) for several reasons: (1) it is the first large gold deposit (i.e., >1 M oz Au) of any type discovered in the SGB, compared to the gold-rich Abitibi greenstone belt (AGB); (2) the deposit defines a new gold environment in that the mineralization (disseminations, veins and breccias) is hosted by a ca. 2741 to 2939 Ma, high-level, subvolcanic tonalite-diorite-quartz diorite intrusive complex which is atypical in the AGB (Robert et al. 2005); and (3) based on Re-Os dating of molybdenite that is co-genetic with gold mineralization, the deposit ...

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Techniques for analysis and visualization of lithogeochemical data with applications to the Swayze greenstone belt, Ontario

Harris

Wilkinson

Grunsky

et al. 1999

Journal of Geochemical Exploration

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Regional geology, structure, and mineral deposits of the Archean Swayze Greenstone Belt, southern Superior Province, Ontario

Cited by 4 publications

References 0 publications

Analysis of geochemical data for mineral exploration using a GIS — A case study from the Swayze greenstone belt, northern Ontario, Canada

Analysis of geochemical data for mineral exploration using a GIS — A case study from the Swayze greenstone belt, northern Ontario, Canada

The geology, petrology, and geochronology of the Archean Côté Gold large-tonnage, low-grade intrusion-related Au(–Cu) deposit, Swayze greenstone belt, Ontario, Canada

Techniques for analysis and visualization of lithogeochemical data with applications to the Swayze greenstone belt, Ontario

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