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Abstract:

The Birchy Complex of the Baie Verte Peninsula, northwestern Newfoundland, comprises an assemblage of mafic schist, ultramafic rocks, and metasedimentary rocks that are structurally sandwiched between overlying ca. 490 Ma ophiolite massifs of the Baie Verte oceanic tract and underlying metas edim en tary rocks of the Fleur de Lys Supergroup of the Appalachian Humber margin. Birchy Complex gabbro yielded a Late Ediacaran U-Pb zircon ID-TIMS age of 558.3 ± 0.7 Ma, whereas gabbro and an intermediate tuffaceous schist yielded LA-ICPMS concordia zircon ages of 564 + 7.5 Ma and 556 + 4 Ma, respectively. These ages overlap the last phase of rift related magmatism observed along the Humber margin of the northern Appalachians (565-550 Ma). The associated ultramafic rocks were exhumed by the Late Ediacaran and shed detritus into the interleaved sedimentary rocks. Psammite in the overlying Flat Point Formation yielded a detrital zircon population typical of the Laurentian Humber margin in the northern Appalachians. Age relationships and characteristics of the Birchy Complex and adjacent Rattling Brook Group suggest that the ultramafic rocks represent slices of continental lithospheric mantle exhumed onto the seafloor shortly before or coeval with magmatic accretion of mid-ocean ridge basaltlike mafic rocks. Hence, they represent the remnants of an ocean - continent transition zone formed during hyperextension of the Humber margin prior to establishment of a mid-ocean ridge farther outboard in the Iapetus Ocean. We propose that microcontinents such as Dashwoods and the Rattling Brook Group formed as a hanging wall block and an extensional crustal allochthon, respectively, analogous to the isolation of the Brianconnais block during the opening of the Alpine Ligurian-Piemonte and Valais oceanic seaways. © 2013 GAC/AGC®.

Registro:

Documento: Artículo
Título:Evidence of Late Ediacaran hyperextension of the Laurentian Iapetan margin in the Birchy Complex, Baie Verte Peninsula, northwest Newfoundland: Implications for the opening of Iapetus, formation of peri-Laurentian microcontinents and Taconic - Grampian orogenesis
Autor:van Staal, C.R.; Chew, D.M.; Zagorevski, A.; McNicoll, V.; Hibbard, J.; Skulski, T.; Castonguay, S.; Escayola, M.P.; Sylvester, P.J.
Filiación:Natural Resources Canada, Geological Survey of Canada, Vancouver, BC V6B 5J3, Canada
Department of Geology, Trinity College Dublin, Dublin, Ireland
Natural Resources Canada, Geological Survey of Canada, Ottawa, ON K1A 0E8, Canada
Department of Marine, Earth and Atmospheric Sciences, North Carolina State University Raleigh, NC 27695-8208, United States
Natural Resources Canada, Geological Survey of Canada, QC, G1K9A9, Canada
CONICET, University of Buenos, Aires Buenos Aires, C1428EHA, Argentina
Department of Earth Sciences Memorial University, St. John's, NL, A1B 3X5, Canada
Palabras clave:Detrital zircon; Lithospheric mantle; Metasedimentary rocks; Mid-ocean ridges; Newfoundlands; Northern Appalachians; Transition zones; Ultramafic rocks; Inductively coupled plasma mass spectrometry; Lead; Submarine geology; Zircon; Sedimentary rocks; age; allochthon; detritus; Ediacaran; hanging wall; Iapetus Ocean; Laurentia; magmatism; mid-ocean ridge; ophiolite; orogeny; schist; seafloor; transition zone; zircon; Appalachians; Baie Verte Peninsula; Canada; England; Humber River; Newfoundland; Newfoundland and Labrador; Switzerland; United Kingdom; Valais
Año:2013
Volumen:40
Número:2
Página de inicio:94
Página de fin:117
DOI: http://dx.doi.org/10.12789/geocanj.2013.40.006
Título revista:Geoscience Canada
Título revista abreviado:Geosci. Can.
ISSN:03150941
CODEN:GSCNA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03150941_v40_n2_p94_vanStaal

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Citas:

---------- APA ----------
van Staal, C.R., Chew, D.M., Zagorevski, A., McNicoll, V., Hibbard, J., Skulski, T., Castonguay, S.,..., Sylvester, P.J. (2013) . Evidence of Late Ediacaran hyperextension of the Laurentian Iapetan margin in the Birchy Complex, Baie Verte Peninsula, northwest Newfoundland: Implications for the opening of Iapetus, formation of peri-Laurentian microcontinents and Taconic - Grampian orogenesis. Geoscience Canada, 40(2), 94-117.
http://dx.doi.org/10.12789/geocanj.2013.40.006
---------- CHICAGO ----------
van Staal, C.R., Chew, D.M., Zagorevski, A., McNicoll, V., Hibbard, J., Skulski, T., et al. "Evidence of Late Ediacaran hyperextension of the Laurentian Iapetan margin in the Birchy Complex, Baie Verte Peninsula, northwest Newfoundland: Implications for the opening of Iapetus, formation of peri-Laurentian microcontinents and Taconic - Grampian orogenesis" . Geoscience Canada 40, no. 2 (2013) : 94-117.
http://dx.doi.org/10.12789/geocanj.2013.40.006
---------- MLA ----------
van Staal, C.R., Chew, D.M., Zagorevski, A., McNicoll, V., Hibbard, J., Skulski, T., et al. "Evidence of Late Ediacaran hyperextension of the Laurentian Iapetan margin in the Birchy Complex, Baie Verte Peninsula, northwest Newfoundland: Implications for the opening of Iapetus, formation of peri-Laurentian microcontinents and Taconic - Grampian orogenesis" . Geoscience Canada, vol. 40, no. 2, 2013, pp. 94-117.
http://dx.doi.org/10.12789/geocanj.2013.40.006
---------- VANCOUVER ----------
van Staal, C.R., Chew, D.M., Zagorevski, A., McNicoll, V., Hibbard, J., Skulski, T., et al. Evidence of Late Ediacaran hyperextension of the Laurentian Iapetan margin in the Birchy Complex, Baie Verte Peninsula, northwest Newfoundland: Implications for the opening of Iapetus, formation of peri-Laurentian microcontinents and Taconic - Grampian orogenesis. Geosci. Can. 2013;40(2):94-117.
http://dx.doi.org/10.12789/geocanj.2013.40.006