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TitleEvolution of late Palaeozoic shearing in the Cobequid Highlands: constraints on the fragmentation of the Appalachian orogen in Nova Scotia along intra-continental shear zones during the formation of Pangea
AuthorPiper, D J WORCID logo; Pe-Piper, G
SourcePannotia to Pangaea: Neoproterozoic and Paleozoic orogenic cycles in the circum-Atlantic region; by Murphy, J B (ed.); Strachan, R A (ed.); Quesada, C (ed.); Geological Society, Special Publication vol. 503, 2020 p. 1-20,
Alt SeriesNatural Resources Canada, Contribution Series 20190545
PublisherGeological Society of London
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia
NTS11D/05; 11D/06; 11D/11; 11D/12; 21A/07; 21A/08; 21A/09; 21A/10
AreaCobequid Highlands; Canada
Lat/Long WENS -65.0000 -63.0000 45.5833 45.3333
Subjectstectonics; paleontology; stratigraphy; geochemistry; geochronology; Science and Technology; Nature and Environment; tectonic evolution; orogenies; shearing; deformation; faulting; displacement; thermal history; magmatism; intrusions; dykes; plutons; volcanism; bedrock geology; structural features; shear zones; fault zones; faults; faults, strike-slip; grabens; lithology; igneous rocks; intrusive rocks; gabbros; granites; sedimentary rocks; biostratigraphy; provenance; isotopic studies; neodymium; radiometric dates; Appalachian Orogen; Acadian Orogeny; Alleghanian Orogeny; Rheic Ocean; Pangea; Cobequid Shear Zone; Laurentia; Minas Fault Zone; Cobequid-Chedabucto Fault; Horton Group; Kirkhill Fault; Rockland Brook Fault; Cobequid Fault; Portapique Fault; Millvale Fault; Spicers Cove Fault; Lynn Mountain Fault; Fountain Lake Group; Phanerozoic; Paleozoic; Permian; Carboniferous; Devonian
Illustrationsgeoscientific sketch maps; geochronological charts; stratigraphic sections; schematic cross-sections; photographs; photomicrographs
ProgramGSC Atlantic Division
Released2020 05 20
AbstractThe Cobequid Highlands of northern Nova Scotia lie at the intersection of two major dextral intra-continental shear zones developed during closure of the Rheic Ocean and formation of Pangea. The Cobequid Shear Zone was an ENE-WSW transfer zone in a NE-SW-trending orogen-parallel shear system in the late Devonian-early Carboniferous (Neo-Acadian phase), in which syn-tectonic granite-gabbro plutons and volcanic strata 4 km thick were progressively deformed along multiple faults. In late Carboniferous to Permian, Alleghanian collision of Africa with Laurentia formed the E-W trending Minas Fault Zone, reactivating parts of the Cobequid Shear Zone. This deformation was mostly taken up on the master Cobequid-Chedabucto Fault. Deformation chronology is well constrained by biostratigraphy of syn-tectonic sediments and by radiometrically dated igneous rocks and minerals in faults and veins. Early strike-slip faults were lubricated by magmatic heating, leading to dyke to pluton construction along multiple faults. During cooling, rooted gabbro was more resistant than ductile granite, thereby deflecting solid-state deformation. Neo-Acadian strike-slip displacement across the shear zone is estimated as >50 km. Alleghanian deformation was influenced by paucity of magmatism and the resistance offered by older stitching plutons.
Summary(Plain Language Summary, not published)
A synthesis of movement on faults in northern Nova Scotia between 370 and 310 million years ago.

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