Geology of the headwaters of the River Philip, Cobequid Highlands

Pe‐Piper, Georgia; Piper, David J. W.; Parlee, K; Turner, Daniel S.

doi:10.4095/194081

Cited by 4 publications

(7 citation statements)

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“…Detailed geochemical and petrological data have been released as a series of Geological Survey of Canada Open Files (Pe- Piper and Turner 1988a;Pe-Piper et al 1994;Pe-Piper 1996;Pe-Piper and Piper 1998a;Pe-Piper 1998, 2001Pe-Piper and Dessureau 2002). Detailed studies of selected areas are reported in fourteen B.Sc.…”

Section: Methods and Datamentioning

confidence: 99%

“…Jeffers Group rocks are also recognised in the River Philip area (Fig. 3) (Pe-Piper et al 1994) and at Dalhousie (Murphy et al 1988(Murphy et al , 2001. At Warwick Mountain and in Baileys Brook (Fig.…”

Section: The Jeffers Blockmentioning

confidence: 96%

“…Here, they are tectonically intercalated with Carboniferous sedimentary and igneous rocks in the hanging wall of the New Annan Thrust . The Jeffers Group can be readily recognized because the volcanic rocks are geochemically distinct from younger Devonian-Carboniferous volcanic rocks (Pe-Piper et al 1994) and, except for lacustrine turbidites in the Horton Group (Piper 1994), no other turbidite units are known from the Cobequid Highlands. The age of the Jeffers Group is Late Neoproterozoic based on a U-Pb age on zircon of 630 ± 2 Ma from a rhyolite in the Gilbert Hills Formation (Murphy et al 1997) and by cross-cutting plutonic rocks of two common geochemical types: the Jeffers block granodiorite unit and the Gunshot Brook granite unit.…”

Section: The Jeffers Blockmentioning

confidence: 99%

“…pluton in the north central Cobequid Highlands is probably of similar age. Detailed descriptions of the Cape Chignecto Pluton are given by and Waldron et al (1989), the Hanna Farm Pluton by Pe- Piper and Turner (1988b), the West Moose River Pluton by Pe-Piper et al (1991), the North River Pluton by Pe-Piper (1991), the Wyvern and Gilbert Hills plutons by Pe-Piper et al (1994), the Pleasant Hills Pluton by Pe-Piper et al (1998), and the Wentworth Pluton by Pe-Piper (1998) and Koukouvelas et al (2002).…”

Section: Late Devonian -Early Carboniferous Plutonic Rocksmentioning

confidence: 99%

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A synopsis of the geology of the Cobequid Highlands, Nova Scotia

Pe‐Piper

Piper

2003

atgeol

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The Cobequid Highlands of Nova Scotia constitute a horst, originally developed in the latest Devonian, exposing Neoproterozoic Avalon terrane rocks on the northern side of the Cobequid Fault. The Neoproterozoic rocks consist of arc volcanic and plutonic rocks and associated sedimentary rocks in two major blocks. The geology of the Jeffers block is similar to that of the Antigonish Highlands, with volcanic rocks and turbidites intruded by granodioritic and granitic plutons. The Bass River block, in the southeast, shows evidence of shear-zone emplacement of a suite of plutonic rocks ranging from gabbro to granodiorite to granite into tectonically juxtaposed ocean fl oor volcanic and shelf sedimentary rocks. The highlands are dominated by E-W trending faults of the Late Paleozoic Cobequid Shear Zone, which developed during oblique convergence between the Avalon and Meguma terranes, and which facilitated the emplacement of gabbro and granite plutons and their extrusive equivalents (Fountain Lake Group) in the latest Devonian -earliest Carboniferous. Lower Paleozoic sedimentary rocks, including Silurian to early Devonian shelf sandstone and siltstone, were highly dismembered by faults associated with terrane convergence. The youngest stratifi ed rocks in the Cobequid Highlands comprise fl uvial and lacustrine sedimentary rocks of the latest Devonian -Tournaisian Horton Group, which accumulated in fault-bound basins. This paper reviews the regional geology of the Cobequid Highlands and provides a comprehensive bibliography of recent work.

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Section: Methods and Datamentioning

confidence: 99%

Section: The Jeffers Blockmentioning

confidence: 96%

Section: The Jeffers Blockmentioning

confidence: 99%

Section: Late Devonian -Early Carboniferous Plutonic Rocksmentioning

confidence: 99%

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A synopsis of the geology of the Cobequid Highlands, Nova Scotia

Pe‐Piper

Piper

2003

atgeol

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“…The Wyvern pluton and associated intrusive rocks occupy a series of east-west trending fault-bounded blocks, with a dis tribution rather different from that mapped by Donohoe and Wallace (1982) (Piper et al, 1994). As in the Folly Lake plu ton, the orientation of felsic veins and feldspar phenocrysts sug gests some syn-magmatic deformation.…”

Section: Plutons Of the Central Cobequid Highlandsmentioning

confidence: 95%

Devonian-Carboniferous igneous intrusions and their deformation, Cobequid Highlands, Nova Scotia

Piper¹,

Pe‐Piper²,

Loncarevic³

1993

atgeol

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Field relationships and regional distribution patterns of igneous rocks in the Cobequid Highlands provide information on sequential styles of deformation during the later Devonian and Carboniferous formation of the Magdalen Basin. New mapping and aeromagnetic data show that large diorite plutons have orthogonal outlines, suggesting that they occupy pullapart space. Diorites both cut and are cut by granite plutons, with magma intermingling relationships suggesting co-existing magmas. Limited dating suggests that most plutonism occurred at about the Devonian-Carboniferous boundary and was preceded by mid to late Devonian volcanism in the eastern Cobequids; younger ages reflect alteration and/or deformation events. Granite veins in diorite plutons show strike-slip syn-magmatic deformation. Ductile thrust deformation of the west ern granite plutons and Fountain Lake Group was followed by brittle faulting and emplacement of dykes along zones of weakness showing east-west pull-apart. Magnetic data reveal that rocks similar to the major diorite plutons underlie much of the central and western Cobequid Highlands and the northeastern part of the Minas sub-basin. The diorite plutons may be an exposed representative of mafic magma that underplated much of the extensional Magdalen Basin. The structure of the Cobequid Highlands is dominated by east-west faults parallel to the Cobequid-Chedabucto Fault that at times acted as transfer faults for major extensional structures in the Magdalen Basin.Les relations de terrain et les types regionaux de distribution des roches ignees dans les hautes terres de Cobequid fournissent des informations sur les styles sequentiels de deformation pendant la formation du bassin de la Madeleine. Une cartographie et des donnees aeromagnetiques recentes montrent que de grands plutons de diorite ont des contours orthogonaux, suggerant qu'ils occupent des espaces de transtension. Les diorites a la fois coupent des plutons de granite et sont recoupes par eux, avec des relations d'enchevetrement de magmas suggerant leur coexistence. Quelques datations suggerent que la plupart du plutonisme a eu lieu pres de la limite Devonien-Carbonifere et qu'il a ete precede par le volcanisme du Devonien moyen a tardif dans les Cobequids orientales; les ages plus jeunes refletent des evenements d'alteration ou de deformation. Des veines de granite dans les plutons de diorite montrent une deformation syn-magmatique en decrochement. La deformation ductile en chevauchement des plutons granitiques occidentaux et du Groupe de Fountain Lake a ete suivie par un faillage cassant et la mise en place de dykes le long de zones de faiblesse montrant des rhombochasmes est-ouest. Les donnees magnetiques revelent que des roches similaires aux plutons majeurs de diorite sont sous-jacentes a une grande partie des hautes terres de Cobequid centrales et occidentales et a la partie nord-est du sous-bassin de Minas. Les plutons de diorite pourraient etre un echantillon affleurant du magma mafique qui s'est accumule sous une grande parti...

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The Jeffers Brook diorite–granodiorite pluton: style of emplacement and role of volatiles at various crustal levels in Avalonian appinites, Canadian Appalachians

Pe‐Piper

Piper

2017

Int J Earth Sci (Geol Rundsch)

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Geology of the headwaters of the River Philip, Cobequid Highlands

Cited by 4 publications

References 0 publications

A synopsis of the geology of the Cobequid Highlands, Nova Scotia

A synopsis of the geology of the Cobequid Highlands, Nova Scotia

Devonian-Carboniferous igneous intrusions and their deformation, Cobequid Highlands, Nova Scotia

The Jeffers Brook diorite–granodiorite pluton: style of emplacement and role of volatiles at various crustal levels in Avalonian appinites, Canadian Appalachians

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