Indentor tectonism in the eastern Grenville Province

Gower, Charles F.; Kamo, Sandra L.; Krogh, T. E.

doi:10.1016/j.precamres.2008.08.004

Cited by 35 publications

(15 citation statements)

References 46 publications

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“…(a) U-Pb age versus 3 Hf of post 1.2 Ga zircons from the post-orogenic sedimentary successions overlain with a color spectrum representing the measured Yb/Hf ratio in each zircon. Timings of the early and late Grenville Orogeny are after Gower et al (2008). (b) is same as in (a), although measured Yb/Hf ratio plotted against 3 Hf with the U-Pb age in the color spectrum.…”

Section: Post-orogenic Successionsmentioning

confidence: 99%

“…The Grenville Orogeny is a 1085e985 Ma tectonothermal event (as per Gower et al, 2008) resulting from continental collision between the southeastern margin of Laurentia with the north and western margins of the Amazonian and/or Kalahari cratons (Dalziel et al, 2000;Tohver et al, 2002;Jacobs et al, 2008;Ibanez-Mejia et al, 2011) during the assembly of the Rodinian supercontinent (Hoffman, 1991). This orogenic event occurred in two discrete phases, an early phase from 1085 to 1040 Ma, and a later one from 1010 to 985 Ma (Gower et al, 2008).…”

Section: Geologic Settingmentioning

confidence: 99%

“…This orogenic event occurred in two discrete phases, an early phase from 1085 to 1040 Ma, and a later one from 1010 to 985 Ma (Gower et al, 2008). The former is characterized by an initial period of intense crustal thickening and upper amphibolite to granulite facies metamorphism (Darling et al, 2004;Bickford et al, 2008), followed by the intrusion of relatively low-volume granitoid magmatism.…”

Section: Geologic Settingmentioning

confidence: 99%

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Generation and preservation of continental crust in the Grenville Orogeny

Spencer

Cawood

Hawkesworth

et al. 2015

Geoscience Frontiers

130

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a b s t r a c tDetrital zircons from modern sediments display an episodic temporal distribution of U-Pb crystallization ages forming a series of 'peaks' and 'troughs'. The peaks are interpreted to represent either periods of enhanced generation of granitic magma perhaps associated with mantle overturn and superplume events, or preferential preservation of continental crust during global collisional orogenesis. The close association of those peaks with the assembly of supercontinents implies a causal relationship between collisional orogenesis and the presence of zircon age peaks. Here these two end-member models (episodic periodicity of increased magmatism versus selective preservation during collisional orogenesis) are assessed using U-Pb, Hf, and O analysis of detrital zircons from sedimentary successions deposited during the w1.3e1.

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Section: Post-orogenic Successionsmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

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Generation and preservation of continental crust in the Grenville Orogeny

Spencer

Cawood

Hawkesworth

et al. 2015

Geoscience Frontiers

130

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“…The Grenvillian orogeny is best documented in its type area in eastern Canada and the State of New York where it records major, northwestdirected, crustal contraction during the mid-to late Mesoproterozoic (Gower et al, 2003(Gower et al, , 2008. Most of its rocks are severely deformed and metamorphosed from upper amphibolite to granulite facies with a wide range of rock types and crystallization ages.…”

Section: Rodinia and The Grenvillian Orogenymentioning

confidence: 99%

The Great Grenvillian Sedimentation Episode: Record of Supercontinent Rodinia's assembly

Rainbird

Cawood

Gehrels

2011

Tectonics of Sedimentary Basins

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One of Earth's greatest mountain-building episodes, the Grenvillian orogeny, occurred with the assembly of the supercontinent Rodinia at the end of the Mesoproterozoic era, about 1.2-1.0 billion years ago. Weathering and erosion of the Grenvillian mountain chain, the roots of which can be traced today for nearly 12,000 km, produced huge volumes of sedimentary detritus that were dispersed by an enormous system of braided rivers. Erosion, denudation, and sediment throughput were enhanced by a lack of vegetation and vigorous continental weathering under a climate that favored strong chemical alteration.

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“…The Mealy Mountains Intrusive Suite (MMIS; 1650-1630 Ma; Gower et al 2008 and references therein) lies approximately 200 km southeast of the Grenville Front and has been emplaced into relatively juvenile and immature, pre-Labradorian (1800-1770 Ma) and early-Labradorian (1710-1655 Ma) orthogneisses and paragneisses that make up a significant portion of the NE sector of the Grenville Province (Emslie & Hegner 1993;Emslie et al 1993;Gower et al 2008a;Gower et al 2008b;Hegner et al 2010). Two distinct massifs make up the anorthositic member of the suite: leuconorites and pyroxene-bearing anorthosites of the Etagaulet massif and leucotroctolites and olivine-bearing anorthosites of the Kenemich massif (Emslie and Bonardi, 1979).…”

Section: Geological Settingmentioning

confidence: 99%