Relationships between Precambrian and Lower Palaeozoic rocks of the ‘Avalon Platform’ in New Brunswick, the northeast Appalachians and the British Isles

Rast, N.; O'Brien, B. H.; Wardle, Richard J.

doi:10.1016/0040-1951(76)90192-x

Cited by 125 publications

(35 citation statements)

References 39 publications

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“…Rast et al, 1976;Kennedy, 1979;van Staal et al, 1998;Valverde-Vaquero et al, 2006) have suggested lithological correlations between the Monian terranes and Ganderia in the Appalachians, where a comparable short-lived compressional event is recorded between 486 Ma and 479 Ma (van Staal et al, 1998). This event resulted in the obduction of the Penobscot backarc basin ophiolites onto the Gander Margin (Colman-Sadd et al, 1992;Zagorevski et al, 2010) at approximately the same time as the Monian deformation.…”

Section: Tremadocian: Monian/penobscot Orogenic Eventsmentioning

confidence: 88%

Peri-Gondwanan terrane interactions recorded in the Cambrian–Ordovician detrital zircon geochronology of North Wales

et al. 2015

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Section: Tremadocian: Monian/penobscot Orogenic Eventsmentioning

confidence: 88%

Peri-Gondwanan terrane interactions recorded in the Cambrian–Ordovician detrital zircon geochronology of North Wales

et al. 2015

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“…The belt extends from eastern Newfoundland to southeastern New England and, possibly, the Carolinas (Avalon terrane of Williams and Hatcher, 1982) and is geologically similar to coeval assemblages in western Europe and West Africa (e.g., Rast et al, 1976;Skehan and Piqué, 1989;Nance et al, 1991).…”

Section: Introductionmentioning

confidence: 98%

Silurian-Devonian dextral reactivation near the inboard margin of the Avalon composite terrane: Kinematic evidence from the Kingston complex, southern New Brunswick, Canada

Schreckengost¹,

Nance²

1996

Special Paper 304: Avalonian and Related Peri-Gondwanan Terranes of the Circum-North Atlantic

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The Kingston complex of southern New Brunswick, Canada, comprises a regional suite of Early Silurian bimodal dikes near the inboard margin of the Avalon composite terrane. The locally sheeted felsic and amphibolitic dikes trend northsouth to northeast-southwest and define a broadly sigmoidal pattern between regional northeast-trending ductile shear zones that border the complex. Dike orientations have been taken to suggest their emplacement accompanied sinistral shear thought to be associated with terrane accretion. However, deformation and greenschist to amphibolite facies metamorphism of the complex accompanied significant dextral shear during the Silurian-Devonian.Mafic dikes are commonly foliated subparallel to their margins, and many possess a stretching lineation defined by elongate blue-green amphibole. Felsic dikes are locally massive but generally display strong mylonitic fabrics of dextral shear sense. Transpressive reactivation of the complex during dextral shear is indicated by (1) a slight but consistent clockwise obliquity between dike trends and the strike of mylonitic foliations, (2) a clockwise rotation of the mineral lineation which plunges steeply in the interior of the complex but becomes progressively more gently plunging near both margins, and (3) a clockwise rotation of dike orientations with mylonitic fabric development. Minor folds and pinch-and-swell structures also attest to contraction during ductile shear. The structural geometry of the complex is consistent with a positive flower structure configuration whereby dip-slip motion in the interior of the complex was progressively replaced by dextral strike-slip motion toward the margins.The transition from sinistral to dextral conditions recorded in the Kingston complex is similar to that recorded along other major northern Appalachian fault zones during the Silurian. It has been suggested that the earlier sinistral movements reflect the accretion of the Avalon composite terrane during the Early Silurian and that the regional kinematic reversal records the docking of the outboard Meguma terrane during the Late Silurian-Early Devonian.Schreckengost, K. A., and Nance, R. D., 1996, Silurian-Devonian dextral reactivation near the inboard margin of the Avalon composite terrane: Kinematic evidence from the Kingston complex, southern New Brunswick, Canada, in Nance, R.

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“…Late Proterozoic arc-related granitoids and related volcanic rocks are a defining characteristic of Avalonian terranes (Rast et al, 1976;Williams, 1979;Nance, 1986). Although the Precambrian age of many of these bodies has long been established by unconformably overlying fossiliferous Cambrian strata (e.g., Billings, 1929, andDowse, 1950, in eastern Massachusetts;Smith, 1977, andSkehan et al, 1978, in Jamestown, Rhode Island;McCartney et al, 1966, in eastern Newfoundland), refining magmatic ages within the Precambrian has been possible only with the relatively recent advent of high precision U-Pb zircon geochronology.…”

Section: Introduction and Geologic Settingmentioning

confidence: 99%

Tectonostratigraphic implications of late Proterozoic U-Pb zircon ages in the Avalon Zone of southeastern New England

Thompson¹,

Hermes²,

Bowring³

et al. 1996

Special Paper 304: Avalonian and Related Peri-Gondwanan Terranes of the Circum-North Atlantic

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U-Pb zircon ages have been determined for several Late Proterozoic igneous units near Boston, Massachusetts, in the AvalonZone of southeastern New England. Crystallization ages are 599 ± 1 Ma for the Westwood Granite, 596 ± 2 Ma for rhyodacite from the Mattapan Volcanic Complex and 589 ± 2 Ma for quartz diorite, which intrudes the Westwood Granite. These results together with published ages from granites of the Dedham Granite, the Esmond-Milford plutonic suite, and granitic gneisses in Massachusetts and Rhode Island fix Avalonian arc magmatism in southeastern New England between ca. 625 and 589 Ma, an interval diachronous with respect to subduction-related plutonism and volcanism in other northern Appalachian Avalonian terranes.

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Relationships between Precambrian and Lower Palaeozoic rocks of the ‘Avalon Platform’ in New Brunswick, the northeast Appalachians and the British Isles

Cited by 125 publications

References 39 publications

Peri-Gondwanan terrane interactions recorded in the Cambrian–Ordovician detrital zircon geochronology of North Wales

Peri-Gondwanan terrane interactions recorded in the Cambrian–Ordovician detrital zircon geochronology of North Wales

Silurian-Devonian dextral reactivation near the inboard margin of the Avalon composite terrane: Kinematic evidence from the Kingston complex, southern New Brunswick, Canada

Tectonostratigraphic implications of late Proterozoic U-Pb zircon ages in the Avalon Zone of southeastern New England

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