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J. Gregory Shellnutt
National Taiwan Normal University
71Publications
18H-index
1,160Citations
Publications 73
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Abstract Post-collisional volcanic rocks associated with the Variscan orogeny are preserved in relicts of Late-Paleozoic volcano-sedimentary basins in the Bohemian Massif (central Europe). They include both the Late Carboniferous calc-alkaline and the Early Permian tholeiitic suites, which were emplaced in an extensional intracontinental setting. Both suites were derived from an enriched continental lithospheric mantle and underwent early fractionation of mafic silicate minerals. A second period...
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#1J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
#2J. Victor Owen (Saint Mary's University)H-Index: 13
Last.Dieu T. Nguyen (NTNU: National Taiwan Normal University)
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The Acadian Orogeny of the Northern Appalachians was caused by accretion of the peri-Gondwanan terranes Avalonia and Meguma to the eastern margin of Laurentia during the Devonian. The lithotectonic relationship between Avalonia and Meguma prior to accretion is uncertain. Radioisotopic dating of detrital zircons from metasedimentary granulite xenoliths from the structural basement to the Meguma terrane indicates that Avalonia and Meguma were proximal and likely contiguous as they transited the Rh...
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#1J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
#2Jaroslav Dostal (Saint Mary's University)H-Index: 29
Understanding the formation and evolution of Precambrian greenstone belts is hampered by gaps in the rock record and the uncertainty of the tectonic regime that was operating at the time. Thus identifying a modern analogue of a Precambrian greenstone belt can be problematic. In this paper we present geological, geochemical and petrological evidence outlining the case for Haida Gwaii (British Columbia, Canada) as a modern example of a greenstone belt. Haida Gwaii is comprised of two rift-related ...
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#1J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
#2Meng-Wan Yeh (NTNU: National Taiwan Normal University)H-Index: 11
Last.Tung-Yi Lee (NTNU: National Taiwan Normal University)H-Index: 25
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Abstract The Saharan Metacraton is largely covered by the Sahel and Sahara with only sparse bedrock exposure making it one of the most poorly studied cratons in the World. Consequently, detrital zircon geochronology is invaluable to discern the lithotectonic development of the Saharan Metacraton in the absence of outcrop. Detrital zircons from the northern Chari River, the largest river system of North-Central Africa, have ages between ∼700 Ma and ∼500 Ma with a small Ordovician (486 ± 11 Ma and...
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#1J. Duncan Keppie (UNAM: National Autonomous University of Mexico)H-Index: 36
#2J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
Last.D. Fraser Keppie (Halifax)H-Index: 7
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Abstract Current interpretations of the geology of Cape Breton Island suggest that it exposes a complete cross-section of the Appalachians from Laurentia across Iapetan vestiges to Avalonia. Crucial to this view is the presence of ca. 1 Ga plutons, including anorthosites, which have been regarded as correlatives of Grenvillian basement, a correlation that overlooks the fact that Avalonia is also underlain by a ca. 1 Ga basement. We analyzed zircons from the Red River anorthosite (Blair River Com...
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#1Jaroslav Dostal (Saint Mary's University)H-Index: 29
#2J. Brendan Murphy (St. Francis Xavier University)H-Index: 44
Last.J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
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1 CitationsSource
#1Alice C.-Y. Liao (NTNU: National Taiwan Normal University)H-Index: 2
#2J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
Last.Chandra B. VermaH-Index: 1
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Abstract The Indian Shield is cross-cut by a number of distinct Paleoproterozoic mafic dyke swarms. The density of dykes in the Dharwar and Bastar Cratons is amongst the highest on Earth. Globally, boninitic dyke swarms are rare compared to tholeiitic dyke swarms and yet they are common within the Southern Indian Shield. Geochronology and geochemistry are used to constrain the petrogenesis and relationship of the boninitic dykes (SiO2 = 51.5 to 55.7 wt%, MgO = 5.8 to 18.7 wt%, and TiO2 = 0.30 wt...
2 CitationsSource
#1Jaroslav Dostal (Saint Mary's University)H-Index: 29
#2J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
Last.B. Neil ChurchH-Index: 2
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Abstract The Allendale Lake stock is a representative intrusion of the Eocene alkaline igneous province in south-central British Columbia (Canada), which forms the northwestern edge of the Montana-Wyoming alkaline province. The shallow-seated intrusion (~53 Ma), about 4.5 km long and 2 km wide, is composed predominately of feldspar-phyric biotite-clinopyroxene-amphibole-bearing monzonitic/syenitic rocks. The feldspar forms distinct rhomb-shaped phenocrysts, which contain abundant exsolution of p...
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#1J. Gregory Shellnutt (NTNU: National Taiwan Normal University)H-Index: 18
Abstract The surface rock composition measured by gamma (γ)-ray spectrometry at the Venera 8 landing site has anomalously high Th (6.5 ± 2.2 ppm) and U (2.2 ± 0.7 ppm) concentrations with respect to the material analyzed at other landing sites (Vega 1, Vega 2, Venera 9, Venera 10). A calculated bulk rock composition of Venera 8, constrained by the measured Th, U and K2O (4.0 ± 1.2 wt%) contents, is similar to silicic to intermediate rocks (diorite/granodiorite) that are typical of terrestrial co...
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