Geophysical atlas of massive sulphide signatures Bathurst mining camp, New Brunswick

Walker, JA; Keating, Pierre; Shives, R B K; Kiss, F; Goodfellow, W D

doi:10.4095/211549

Cited by 12 publications

(21 citation statements)

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“…2) during closure of this basin by NW-directed subduction beneath the Notre Dame arc, and associated accretion with Laurentia during the Caradocian (Late Ordovician; van Staal, 1994). Descriptions of the various groups and formations comprising the BMC can be found in van Staal and Williams (1984), van Staal et al (1992), McCutcheon et al (1993), Wilson (1993), Fyffe et al (1996), and Thomas et al (2000). The Halfmile Lake deposit is hosted by the Tetagouche Group, so this group is the only one described here.…”

Section: Regional Geologymentioning

confidence: 87%

“…The group subsequently underwent ductile deformation and was metamorphosed up to upper greenschist facies in the Late Ordovician (Caradocian) to Late Silurian (Ludlovian) during closure of the back-arc basin by northeast-directed subduction (van Staal and Fyffe, 1995a,b). Thomas et al, 2000).…”

Section: Regional Geologymentioning

confidence: 95%

“…2; Wilson et al, 1998;Thomas et al, 2000). Sedimentary rocks of the Miramichi Group were deposited in the Tetagouche-Exploits back-arc basin during the early rapid stage of roll-back and rifting of the Popelogan-Victoria arc away from Ganderia during the late Arenig .…”

Section: Regional Geologymentioning

confidence: 96%

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Lithogeochemistry and Hydrothermal Alteration at the Halfmile Lake South Deep Zone, a Volcanic-Hosted Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick

Mireku

Stanley²

2006

Exploration and Mining Geology

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The Halfmile Lake South Deep zone, Bathurst Mining Camp, New Brunswick, was discovered by Noranda Inc. (Exploration) as a result of a 3-D seismic survey in 1998 and the subsequent drilling of ten diamond-drill cores. The deposit consists of massive, breccia, and stockwork Pb-Zn-Cu sulfide minerals, and is hosted by a volcano-sedimentary sequence belonging to the overturned Ordovician Tetagouche Group. Epiclastic rocks and interbedded fine-grained felsic pyroclastic rocks dominate the stratigraphic footwall. Locally, crystal-rich felsic tuffs and subordinate epiclastic rocks comprise the immediate stratigraphic hanging wall. The entire stratigraphic sequence was intruded by quartz-feldspar porphyritic intrusions, and cut by intermediate and basic dikes. The volcanic and sedimentary rocks can be discriminated geochemically using trace element ratios such as Zr/TiO 2 and Nb/TiO 2 , despite intensive alteration and cleavage development. These ratios indicate that four protolith volcanic compositions exist: rhyolite, dacite, andesite, and basalt. The aphyric and feldspar-and quartzphyric volcanic rocks are dacitic and rhyolitic in composition; epiclastic rocks have trace element ratios consistent with dacitic compositions.Pearce element ratio diagrams, general element ratio diagrams, and petrographic observations demonstrate that the rhyolitic volcanic rocks exhibit evidence of albite, potassium feldspar, and quartz fractionation, dacitic volcanic rocks exhibit little evidence of any fractionation, and epiclastic sedimentary rocks exhibit evidence of quartz sorting only. Hydrothermal alteration is best represented by the presence of phengitic muscovite and daphnitic chlorite. Minor calcite occurs in the stratigraphic hanging wall, deep in the stratigraphic footwall, and in post-mineralization dikes, and thus is not interpreted to be part of the causative hydrothermal event.Element additions and losses during alteration have been used to determine net alteration reactions, and these have been used to identify alteration parameters that are independent of other forms of alteration and fractionation/sorting, and which can be used to guide exploration. These parameters include: a bulk hydrolysis measure, (2Ca+Na+K-2CO 2 )/Al; a muscovite alteration measure, K/Al; an albite destruction measure, Na/Al; a chlorite alteration measure, (Fe+Mg-S/2)/Al; a chlorite composition measure, (Fe-S/2)/Mg; a sulfidization measure, S/Ti; and a carbonatization measure, CO 2 /Ti. With the exception of the carbonatization measure, these alteration parameters define a distinct lateral and vertical zone of intense hydrothermal alteration in the stratigraphic footwall of the deposit, and demonstrate that the epiclastic rocks are predominantly chlorite altered, and the volcanic rocks are predominantly muscovite altered. Within the alteration halo, element additions of Fe and H, and element losses of Na are characteristic. Potassium was added to muscovite-altered rocks, but subsequently removed from chlorite-altered rocks. The results from this s...

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Section: Regional Geologymentioning

confidence: 87%

Section: Regional Geologymentioning

confidence: 95%

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Lithogeochemistry and Hydrothermal Alteration at the Halfmile Lake South Deep Zone, a Volcanic-Hosted Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick

Mireku

Stanley²

2006

Exploration and Mining Geology

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“…The sequence was deposited in a back-arc basin, developed upon Cambro-Ordovician siliciclastic rocks (flysch sequence) bordering a stable continental margin (van Staal and Fyffe, 1991). As currently understood, the Bathurst Mining Camp is divided into five groups, namely: the Miramichi, Sheephouse Brook, Tetagouche, California Lake, and Fournier groups (see Wilson et al, 1998, Thomas et al, 2000 for detailed descriptions). The Miramichi Group occurs at the base of the sequence and consists mostly of CambroOrdovician siliciclastic rocks, whereas the Fournier Group occurs at the top of the sequence and contains ocean-floor mafic volcanic and related sedimentary rocks.…”

Section: Regional Geologymentioning

confidence: 99%

The Orvan Brook Volcanogenic Massive Sulfide Deposit: Anatomy of a Highly Attenuated Massive Sulfide System, Bathurst Mining Camp, New Brunswick

Walker

Lentz

McClenaghan

2006

Exploration and Mining Geology

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The Orvan Brook deposit is one of several (Zn+Pb>>Cu)-rich sulfide deposits hosted by the Spruce Lake Formation (California Lake Group) in the northwestern part of the Bathurst Mining Camp. This parautochthonous deposit is hosted by a narrow band of highly deformed, locally graphitic shale that appears to conformably overlie felsic volcanic rocks of the Spruce Lake Formation, and is in tectonic contact with overlying mafic volcanic and related sedimentary rocks of the Canoe Landing Lake Formation.The Spruce Lake Formation is dominated by felsic volcanic rocks and subordinate fine-grained sedimentary rocks, and mafic volcanic rocks (Canoe Landing Lake member). The felsic volcanic rocks can be divided into aphyric and feldspar-phyric rock types. The feldspar-phyric rocks and a few of the aphyric varieties have a Zr/TiO 2 ratio of 0.06, and fall into the California Lake Group field on a Y/TiO 2 versus Zr/TiO 2 diagram. In contrast, the aphyric felsic volcanic rocks have Zr/TiO 2 ≈ 0.09 and are marked by high Zr and Th, which is consistent with highly fractionated felsic magma of Spruce Lake affinity. Major and trace element analyses of host rocks suggest that weak to moderate hydrothermal alteration developed on the south side (stratigraphic footwall) of the deposit, which is consistent with a north-younging succession.The sulfide lens strikes east-west for approximately 2.3 km, extends down-dip for at least 500 m locally, and has an average thickness of between 0.75 and 1 m, but is locally up to 5.5 m thick. The contacts of the massive sulfide lens with its host rocks are invariably sharp. Host rocks show evidence of intense ductile deformation as well as later brittle deformation. Compositional layering and sulfide breccia textures in the sulfide body are interpreted to result from deformation or tectonic enhancement of original primary layering. The deposit contains an estimated resource of 2.69 Mt grading 1.73% Pb, 5.95% Zn, 0.37% Cu, 72 g/t Ag, and 0.9 g/t Au. Similarities in bulk δ 34 S between the Orvan Brook (+8.6‰) and the nearby Cu-rich McMaster deposit (+8.2‰) suggest a common depositional setting.Sommaire -Le gisement d'Orvan Brook appartient à un groupe de plusieurs gîtes de sulfures (Zn+Pb>>Cu) au sein de la Formation de Spruce Lake (Groupe de California Lake) dans la partie nordouest du Camp Minier de Bathurst. Ce gisement parautochtone est situé dans une mince bande de shale fortement déformée et localement graphitique qui recouvre en conformité les roches volcaniques felsiques de la Formation de Spruce Lake. Ces shales sont aussi en contact tectonique avec les roches volcaniques mafiques (Membre de Canoe Landing Lake) sus-jacentes.La Formation de Spruce Lake consiste principalement en roches volcaniques felsiques accompagnées de quantités moindres de roches sédimentaires à grains fins, et de roches volcaniques mafiques (Membre de Canoe Landing Lake). On distingue ces roches volcaniques felsiques en deux types, selon qu'elles sont aphyriques ou porphyriques à feldspath. Les roches porphyriques à feld...

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“…Magnetic anomalies in the NMS predominantly emanate from mafic volcanic and mafic intrusive rocks, which have shown from laboratory magnetic susceptibility measurements to locally be highly susceptible (Thomas et al . ; Tschirhart . Conductivity anomalies are locally caused by black shale beds, argillite, and chloritic formations (Keating et al .…”

Section: Test Area and Survey Datamentioning

confidence: 99%

Improved edge detection mapping through stacking and integration: a case study in the Bathurst Mining Camp

Tschirhart¹,

Morris

2014

Geophysical Prospecting

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Airborne geophysical surveys provide spatially continuous regional data coverage, which directly reflects subsurface petrophysical differences and thus the underlying geology. A modern geologic mapping exercise requires the fusion of this information to complement what is typically limited regional outcrop. Often, interpretation of the geophysical data in a geological context is done qualitatively using total field and derivative maps. With a qualitative approach, the resulting map product may reflect the interpreter's bias. Source edge detection provides a quantitative means to map lateral physical property changes in potential and non‐potential field data. There are a number of Source edge detection algorithms, all of which apply a transformation to convert local signal inflections associated with source edges into local maxima. As a consequence of differences in their computation, the various algorithms generate slightly different results for any given source depth, geometry, contrast, and noise levels. To enhance the viability of any detected edge, it is recommended that one combines the output of several Source edge detection algorithms. Here we introduce a simple data compilation method, deemed edge stacking, which improves the interpretable product of Source edge detection through direct gridding, grid addition, and amplitude thresholding. In two examples, i.e., a synthetic example and a real‐world example from the Bathurst Mining Camp, New Brunswick, Canada, a number of transformation algorithms are applied to gridded geophysical data sets and the resulting Source edge detection solutions combined. Edge stacking combines the benefits and nuances of each Source edge detection algorithm; coincident or overlapping and laterally continuous solutions are considered more indicative of a true edge, whereas isolated points are taken as being indicative of random noise or false solutions. When additional data types are available, as in our example, they may also be integrated to create a more complete geologic model. The effectiveness of this method is limited only by the resolution of each survey data set and the necessity of lateral physical property contrasts. The end product aims at creating a petrophysical contact map, which, when integrated with known lithological outcrop information, can be led to an improved geological map.

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Geophysical atlas of massive sulphide signatures Bathurst mining camp, New Brunswick

Cited by 12 publications

References 0 publications

Lithogeochemistry and Hydrothermal Alteration at the Halfmile Lake South Deep Zone, a Volcanic-Hosted Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick

Lithogeochemistry and Hydrothermal Alteration at the Halfmile Lake South Deep Zone, a Volcanic-Hosted Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick

The Orvan Brook Volcanogenic Massive Sulfide Deposit: Anatomy of a Highly Attenuated Massive Sulfide System, Bathurst Mining Camp, New Brunswick

Improved edge detection mapping through stacking and integration: a case study in the Bathurst Mining Camp

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