Geology and Massive Sulphides of the Bathurst area, New Brunswick

Davies, J.L.; Fyffe, L. R.; McAllister, Angela

doi:10.4095/119789

Cited by 6 publications

(12 citation statements)

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“…13). The older pre-or synore volcanics are predominantly felsic in composition, whereas the younger, postore volcanic rocks are predominantly mafic (Skinner, 1974;Davies and McAllister, 1980). The felsic volcanics, consisting mainly of submarine ash-flow tuffs (Loudon, 1960; J. L. Davies et al, unpub.…”

Section: A Recent Investigation Of the Gjersvik Group (Grenne And Rmentioning

confidence: 96%

“…The present interpretation of the stratigraphy in the Tetagouche Group (Davies and McAllister, 1980) Slack, 1979). Lead and zinc are locally abundant, perhaps being best developed at the Silver Hill mine, North Carolina (Indorf, 1981), and tin is present in some areas (Bell, 1982).…”

Section: Likewise Inferred An Alkaline Basalt Composition and A Withimentioning

confidence: 98%

“…The volcanics are dominantly felsic fragmental rocks consisting of fine- Franklin et al, 1981). Numbered deposits are those reported by Davies and McAllister (1980) to contain more than 5 million metric tons: 1, Brunswick 6; 2, Brunswick 12; 3, Caribou; 4, Heath Steele; 5, Chester; 6, Murray Brook; 7, Half Mile Lake. grained crystal and lapilli tuffs, with subordinate amounts of marie material (Sundelius, 1970;Seiders, 1978;Rodgers, 1982) Seiders, 1978;Feiss, 1982) show a strongly bimodal distribution of SiO2 values and extremely variable contents of alkali elements and Ca; the marie volcanics show low TiO2 values (generally <1.3%).…”

Section: Likewise Inferred An Alkaline Basalt Composition and A Withimentioning

confidence: 99%

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Correlation of massive sulfide deposits in the Appalachian-Caledonian orogen on the basis of paleotectonic setting

Stephens¹,

Swinden²,

Slack³

1984

Economic Geology

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Over 70 major (>1 million metric tons) strata-bound and stratiform sulfide deposits of late Proterozoic and early Paleozoic age in the fragmented Appalachian-Caledonian orogen are correlated on the basis of their palcotectonic setting. The latter is defined in terms of two parameters, the plate tectonic palcosetting and the palcogeographic location relative to various cratonic margins. Attention is focused on geochemical data from mafic volcanic and high-level intrusive rocks associated with massive sulfide deposits, as well as on structural settings and regional tectonostratigraphic correlations. Host-rock data for over 20 key deposits or groups of deposits are discussed. Massive sulfides formed in intraplate (ensialic) as well as ocean-floor and convergent plate boundary settings are recognized in the orogen. The intraplate (ensialic) setting involves environments marginal to the Laurentian and Baltoscandian cratons; it includes both sedimentary and volcanic host-rock sequences and is interpreted as an incipientdivergent plate boundary. The ocean-floor setting includes massive sulfides in ophiolites formed either at a major ocean spreading axis or within back-or interarc basins, as well as deposits hosted by sequences of mafic volcanics, graphitic phyllite, and chert possibly formed in an off-axis (intraplate) situation; deposits in this setting are restricted to the northern Appalachians and the Norwegian Caledonides. The convergent plate boundary setting includes massive sulfides hosted by subduction-related volcanics, and by postarc and post-early collision volcano-sedimentary sequences. Both ensimatic and ensialic subarc crustal environments are represented, the latter recognized outboard (northwest) of the Avalonian platform in the Appalachians and its equivalent in the United Kingdom-Ireland Caledonides. The majority of massive sulfide deposits in the orogen formed within a convergent plate boundary setting. Assessment of the host-rock data in connection with the correlation theme has revealed:(1) the presence of both regional and sulfide-localized alterations in volcanic host rocks and the occurrence of sulfide-localized alteration in several of the sediment-hosted deposits; (2) evidence for an extensional tectonic regime either during or immediately after deposition of many of the massive sulfide deposits, including some of those formed in a convergent plate boundary setting (rifted-arc, postarc, and post-early collision sequences); (3) the likelihood that massive sulfides were deposited during a single cycle of ocean basin opening and closure, although possible reservations to this model are raised by volcanic-hosted deposits in the southern Appalachians; and (4) possible target areas for future mineral exploration.

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Section: A Recent Investigation Of the Gjersvik Group (Grenne And Rmentioning

confidence: 96%

Section: Likewise Inferred An Alkaline Basalt Composition and A Withimentioning

confidence: 98%

Section: Likewise Inferred An Alkaline Basalt Composition and A Withimentioning

confidence: 99%

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Correlation of massive sulfide deposits in the Appalachian-Caledonian orogen on the basis of paleotectonic setting

Stephens¹,

Swinden²,

Slack³

1984

Economic Geology

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“…In terms of tectonostratigraphic setting, the Tetagouche Group, host to the Bathurst area deposits, is closely comparable to the volcanic sequences of the Hermitage flexure area, which occur at the northwestern edge of the Gander zone (Williams, 1978). Volcanism in the Tetagouche Group was dominantly felsic in character, particularly in the stratigraphic succession below the mineralization(Davies and McAllister, 1980). The presence of quartzofeldspathic sediments at the bottom of the sequence has been cited by numerous authors as evidence that the volcanism was floored by continental crust (e.g.,Davies and McAllister, 1980), although it is equally plausible that the substrate was a thick pile of continentally derived sediments adjacent to a continental margin.…”

mentioning

confidence: 98%

“…Volcanism in the Tetagouche Group was dominantly felsic in character, particularly in the stratigraphic succession below the mineralization(Davies and McAllister, 1980). The presence of quartzofeldspathic sediments at the bottom of the sequence has been cited by numerous authors as evidence that the volcanism was floored by continental crust (e.g.,Davies and McAllister, 1980), although it is equally plausible that the substrate was a thick pile of continentally derived sediments adjacent to a continental margin. The geologic and lead isotope similarities between the two areas strongly suggest that they represent broadly similar and perhaps equivalent tectonostratigraphic settings.…”

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confidence: 98%

Variations in style of volcanism and massive sulfide deposition in Early to Middle Ordovician island-arc sequences of the Newfoundland Central Mobile Belt

Swinden¹,

Thorpe

1984

Economic Geology

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The Newfoundland Central mobile belt records the Early Paleozoic birth, development, and destruction of the Iapetus ocean. Following opening of the ocean in the Cambrian, a compressional plate margin developed in the Early Ordovician and an island arc was formed above an east-dipping subduction zone. Volcanism was active at this plate margin from late Tremadocian to early Caradocian, at which time subduction ceased and the products of the volcanism were blanketed by argillite and flysch.The pre-Caradocian island-arc volcanic sequences of the Central mobile belt are host to numerous volcanogenic massive sulfide occurrences. Both the volcanic rocks and the associated massive sulfide occurrences show distinct contrasts across the volcanic belt. In the northern part of the belt (Notre Dame Bay area), submarine, dominantly mafic, volcanic rocks host pyritic Cu-Zn deposits associated with local felsic domes. These sequences pass southward into the Victoria River area, where volcanic rocks are characterized by laterally extensive felsic pyroelastic sheets which host polymetallic Zn-Pb-Cu deposits. In southern Newfoundland (the Hermitage flexure area), partially emergent, preponderantly felsic volcanic rocks host Pb-Zn-Ag massive sulfide mineralization formed during the waning stages of volcanism.Lead isotope ratios in massive sulfide deposits in the Hermitage flexure area are consistently more radiogenic than in deposits hosted by more mafic volcanic sequences to the north. This, coupled with geologic evidence, suggests that these sequences formed under the influence of sialic crustal material. It is inferred that the Early-Middle Ordovician island-arc volcanism in the Newfoundland Central mobile belt occurred in both oceanic and continental margin settings. The compositions and geologic environments of the associated massive sulfide deposits reflect these variations in tectonostratigraphic settings.Time and space relationships within the volcanic arc during the interval of active volcanism are not entirely clear. All Early to Middle Ordovician volcanic rocks in central Newfoundland may have formed from contemporaneous volcanic activity. If this is the case, simultaneous volcanism must have occurred both in oceanic environments and at or near the continental margin. Alternatively, the volcanism may have been slightly diachronous with an early episode of ensimatic mafic volcanism followed by migration of the volcanic centers toward the continental margin.The massive sulfide deposits of the pre-Caradocian island arc e. xhibit lead isotope ratios which are distinctly more radiogenic than those in the Buchans, Roberts Arm, and postCaradocian Cutwell Groups. This appears to support geologically based inferences that the latter sequences are not part of the main phase of island-arc activity in central Newfoundland.

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Understanding Mineral Deposits

Misra¹

2000

103

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Geology and Massive Sulphides of the Bathurst area, New Brunswick

Cited by 6 publications

References 0 publications

Correlation of massive sulfide deposits in the Appalachian-Caledonian orogen on the basis of paleotectonic setting

Correlation of massive sulfide deposits in the Appalachian-Caledonian orogen on the basis of paleotectonic setting

Variations in style of volcanism and massive sulfide deposition in Early to Middle Ordovician island-arc sequences of the Newfoundland Central Mobile Belt

Understanding Mineral Deposits

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