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TitleEarly Paleozoic development of the Maine-Quebec Boundary Mountains region
AuthorGerbi, C C; Johnson, S E; Aleinikoff, J N; Bédard, J H; Dunning, G R; Fanning, C M
SourceCanadian Journal of Earth Sciences vol. 43, no. 3, 2006 p. 367-389, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20060715
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf; xls
NTS11D; 11E; 11F; 21A; 21B; 21G; 21H
AreaMaine; Boundary Mountains; Appalachians; Canada; United States of America
Lat/Long WENS-74.0000 -60.0000 46.0000 41.0000
Subjectstectonics; igneous and metamorphic petrology; geochronology; geochemistry; orogenesis; ophiolites; gabbros; tonalites; granodiorites; uranium lead ratios; uranium lead dating; radiometric dates; whole rock geochemistry; Chain Lakes Massif; Boil Mountain Complex; Jim Pond Formation; Skinner Pluton; Attean Pluton; Paleozoic; Ordovician; Silurian; Devonian
Illustrationssketch maps; photomicrographs; tables; plots
ProgramGeological Society of America, Funding Program
AbstractPre-Silurian bedrock units played key roles in the early Paleozoic history of the Maine-Quebec Appalachians. These units represent peri-Laurentian material whose collision with the craton deformed the Neoproteozoic passive margin and initiated the Appalachian mountain-building cycle. We present new field, petrological, geochronological, and geochemical data to support the following interpretations related to these units. (1) The Boil Mountain Complex and Jim Pond Formation do not represent part of a coherent ophiolite. (2) Gabbro and tonalite of the Boil Mountain Complex intruded the Chain Lakes massif at ca. 477 Ma. (3) The Skinner pluton, an arc-related granodiorite, intruded the Chain Lakes massif at ca. 472 Ma. (4) The Attean pluton, with a reconfirmed age of ca. 443 Ma, is unrelated to Early Ordovician orogenesis. (5) The most likely timing for the juxtaposition of the Jim Pond Formation and the Boil Mountain Complex was during regional Devonian deformation. These interpretations suggest that the Boundary Mountains were once part of a series of arcs extending at least from central New England through Newfoundland.

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