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Stephen T. Johnston
University of Alberta
112Publications
26H-index
2,362Citations
Publications 114
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#1Yunfeng Chen (U of A: University of Alberta)H-Index: 4
#2Yu Jeffrey Gu (U of A: University of Alberta)H-Index: 23
Last.Pascal Audet (U of O: University of Ottawa)H-Index: 21
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The origin of the North American Cordillera and its affinity with the bounding craton are subjects of contentious debate. The mechanisms of orogenesis are rooted in two competing hypotheses known as the accretionary and collisional models. The former model attributes the Cordillera to an archetypal accretionary orogen comprising a collage of exotic terranes. The latter, less popular view argues that the Cordillera is a collisional product between an allochthonous ribbon microcontinent and craton...
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#1William CavazzaH-Index: 23
#2Stephen T. JohnstonH-Index: 26
Last.and Olivier Lacombe (UPMC: Pierre-and-Marie-Curie University)
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#1Lu Wang (China University of Geosciences)H-Index: 1
#2Stephen T. Johnston (U of A: University of Alberta)H-Index: 26
Last.Nengsong Chen (China University of Geosciences)H-Index: 1
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1 CitationsSource
#1David Boutelier (University of Newcastle)H-Index: 18
#2L. Gagnon (UVic: University of Victoria)H-Index: 1
Last.Alexander R. Cruden (Monash University, Clayton campus)H-Index: 32
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Abstract Three-dimensional analogue models are employed to investigate whether oroclines may develop by horizontal buckling. A first series of experiments demonstrates that a crustal ribbon carried by a subducting plate cannot buckle and detach from its mantle root because it weakens and deforms when entering the subduction zone, such that little compressive stress is transferred through the ribbon. A second series of experiments shows that the aspect ratio of the ribbon impacts the wavelength o...
2 CitationsSource
#1D. F. McLeish (UVic: University of Victoria)
#2Stephen T. Johnston (UVic: University of Victoria)H-Index: 26
Paleozoic continental margin strata in the western Foreland Belt of the Canadian Cordillera are characterized in part by alkaline volcanic sequences, carbonatite intrusions, coarse clastic sedimentary units, and erosional unconformities. These strata also contain a record of mid-Paleozoic contractional deformation unseen in coeval passive margin strata in the eastern Foreland Belt. In order to test potential genetic links between Paleozoic alkaline igneous activity, active margin sedimentation, ...
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#1Wenbo Zhang (U of A: University of Alberta)H-Index: 1
#2Stephen T. Johnston (U of A: University of Alberta)H-Index: 26
Last.Claire A. Currie (U of A: University of Alberta)H-Index: 20
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1 CitationsSource
#1Christopher J. Spencer (Curtin University)H-Index: 20
#2J. B. Murphy (St. Francis Xavier University)H-Index: 1
Last.William J. Collins (Curtin University)H-Index: 72
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#1Dante Canil (UVic: University of Victoria)H-Index: 35
#2Ryan Grundy (UVic: University of Victoria)H-Index: 1
Last.Stephen T. Johnston (U of A: University of Alberta)H-Index: 26
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Abstract We examine the partial melting and the cooling history of a ~5 km section of mantle lithosphere preserved in the Donjek massif, part of a Permian ophiolite in the northern Cordillera of Yukon, Canada. The mantle rocks are depleted spinel harzburgite containing n (0.02 to 0.07) compared to most other ophiolites. The REE patterns of clinopyroxene can be modeled as 16–20% partial melts of typical depleted mid-ocean ridge (MOR) mantle. The REE exchange between coexisting ortho- and clinopyr...
1 CitationsSource
#1Theron Finley (U of A: University of Alberta)
#2Kristin D. Morell (UCSB: University of California, Santa Barbara)H-Index: 8
Last.Wenbo Zhang (U of A: University of Alberta)H-Index: 1
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#1Arlo Brandon Weil (Bryn Mawr College)H-Index: 27
#2Daniel Pastor-Galán (Tohoku University)H-Index: 16
Last.Gabriel Gutie´rrez-Alonso (University of Salamanca)H-Index: 34
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The Paleozoic geology of Iberia is dominated by the tectonics of the Variscan orogeny and its aftermath. This defining geologic event was the result of large-scale collision that involved amalgamation of multiple continents and micro-continents, the closure of oceanic basins and eventual orogenic collapse, and finally modification and oroclinal bending during the waning stages of Pangea amalgamation. Existing data from the western Variscan orogen, suggests oroclinal bending of an originally near...
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