Geochronology of the Swift Current granite and host volcanic rocks of the Love Cove Group, southwestern Avalon zone, Newfoundland: evidence of a late Proterozoic volcanic–subvolcanic association

Dallmeyer, R. D.; Odom, A. L.; O'Driscoll, C. F.; Hussey, E. M.

doi:10.1139/e81-065

Cited by 32 publications

(7 citation statements)

References 16 publications

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“…620 Ma association described above, and 40 Ar/ 39 Ar (hornblende) ages of ca. 570-560 Ma also support this view (Dallmeyer et al, 1981). However, a final resolution requires more U-Pb dating.…”

Section: Additional Commentsmentioning

confidence: 77%

“…630 Ma to ca. 600 Ma (Dallmeyer et al, 1981;Krogh et al, 1988;O'Brien et al, 1992b) are a major component of the Avalon terrane in Newfoundland. West of the Paradise Sound fault, they include the Marystown, Love Cove, and Connaigre Bay groups (O'Brien et al, , 1990(O'Brien et al, , 1992a (Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

“…Intruded volcanic rocks of the Love Cove Group, and suggested to be comagmatic with them by Dallmeyer et al (1981).…”

Section: Additional Commentsmentioning

confidence: 99%

“…580 ± 20 Ma (U-Pb zircon), 548 ± 11 Ma (Rb-Sr whole-rock), 566-560 Ma (Ar-Ar) (Dallmeyer et al, 1981).…”

Section: Geochronological Datamentioning

confidence: 99%

“…A U-Pb (zircon) age of 580 ± 20 Ma was viewed by Dallmeyer et al (1981) as a minimum age, due to probable Pb loss. However, Krogh et al (1988) subsequently pointed out that these data are not colinear, and advised caution in their interpretation.…”

Section: Additional Commentsmentioning

confidence: 99%

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Late Precambrian plutons in the Avalon terrane of New Brunswick, Nova Scotia, and Newfoundland

Barr¹,

Kerr²

1997

The Nature of Magmatism in the Appalachian Orogen

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Comparison of late Precambrian plutonic rocks in three parts of the Avalon terrane of the northern Appalachian orogen (the Caledonia terrane in southern NewBrunswick, the Mira terrane of southeastern Cape Breton Island, and the type area of the Avalon terrane in eastern Newfoundland) shows that ca. 620 Ma plutonic rocks and voluminous coeval volcanic rocks occur in all three areas. The ca. 620 Ma plutonic rocks range from gabbro and diorite to granite, and have petrochemical features indicative of origin in continental margin volcanic arcs. Remnants of older, ca. 680 Ma, arc complexes occur in the western part of the Newfoundland Avalon terrane and in the Mira terrane, although granitoid plutonic rocks of that age are preserved only in the former area. Younger, ca. 580-550 Ma, plutonic rocks occur in all three areas but differ in petrological features and apparent tectonic setting: (1) in the Caledonia terrane, ca. 560-550 Ma bimodal granitic-dioritic and/or gabbroic plutons are a major component, and apparently formed during major extension within the former ca. 620 Ma arc; (2) in the Mira terrane granitic plutons have ages of ca. 575 Ma, and formed in association with a ca. 575-560(?) Ma volcanic arc; (3) in the central part of the Newfoundland Avalon terrane, arc-related plutonic and volcanic rocks of ca. 580-560 Ma age may also be widespread, but their ages are poorly constrained. Bimodal, dominantly alkaline to peralkaline ca. 570 Ma and ca. 550 Ma plutonic suites are also present in Newfoundland, but do not appear to be present in either the Mira or Caledonia terranes.

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Section: Additional Commentsmentioning

confidence: 77%

Section: Geologic Settingmentioning

confidence: 99%

“…Intruded volcanic rocks of the Love Cove Group, and suggested to be comagmatic with them by Dallmeyer et al (1981).…”

Section: Additional Commentsmentioning

confidence: 99%

“…580 ± 20 Ma (U-Pb zircon), 548 ± 11 Ma (Rb-Sr whole-rock), 566-560 Ma (Ar-Ar) (Dallmeyer et al, 1981).…”

Section: Geochronological Datamentioning

confidence: 99%

Section: Additional Commentsmentioning

confidence: 99%

See 3 more Smart Citations

Late Precambrian plutons in the Avalon terrane of New Brunswick, Nova Scotia, and Newfoundland

Barr¹,

Kerr²

1997

The Nature of Magmatism in the Appalachian Orogen

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The Avalon Zone: A Pan‐African terrane in the Appalachian Orogen of Canada

1983

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The Precambrian sequences of the Avalon Zone in Canada (southeastern margin of the Appalachian Orogen) are interpreted as a Pan‐African orogenic belt incorporated into the Appalachian Orogen during Palaeozoic times as its southeastern margin. The Precambrian evolution of the Avalon Zone was genetically unrelated to subsequent Palaeozoic evolution. The Avalon Zone shows marked similarities in age, tectonic history, and facies development to the Pan‐African belts adjacent to the West African Craton. Precambrian evolution of the zone began with circa 800 Ma rifting of a sialic gneissic basement and deposition of a Middle Proterozoic(?) carbonate‐clastic cover sequence. Early crustal rifting was associated with localized partial melting and metamorphism. Limited crustal separation led to the restricted development of circa 760 Ma oceanic volcanics. Continued rifting and subsequent closure of these narrow ocean basins led to the eruption of widespread subaerial volcanic suites, block faulting, granite plutonism, and local, late Proterozoic sedimentary basin formation. Precambrian evolution of the zone terminated with the Avalonian Orogeny (circa 650‐600 Ma), a deformational event, the affects of which are most evident locally along the northwestern margin of the zone. The controlling features of the Proterozoic evolution of the Avalon Zone are a series of linear intracratonic troughs and small ocean basins that formed during thinning and separation of the crust by ductile spreading, rupture, and delamination (cf. Martin and Porada 1977). The variation in degree of crustal separation led to subsequent variation in orogenesis during late Proterozoic compression. The zone marks the original westward limit of Pan‐African activity and displays no apparent genetic link with the Appalachian Orogen in Canada until Devonian times.

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