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Skolai/Sicker arc system

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Journal Article
Journal: Lithosphere
Published: 01 August 2014
Lithosphere (2014) 6 (4): 270-276.
... arc) and are interpreted as the southern extension of the Skolai arc. We propose that the gabbros represent the initiation of extension through an arc located at the margin of the Alexander terrane (Skolai/Sicker arc system). Extension progressed enough to deposit basalts within a back-arc basin...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2007
GSA Bulletin (2007) 119 (9-10): 1168-1184.
... of the inherited zircons and the isotopic signatures of plutons from the central and western Talkeetna Mountains are consistent with assimilation of basement lithologies from the adjacent Wrangellia terrane. In southern Alaska, the Wrangellia terrane is composed of the Paleozoic Skolai arc, the extensive Triassic...
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Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2013
DOI: 10.5382/SP.17.03
EISBN: 9781629491639
... to a change from an offshore arc system controlled by slab rollback, to one in which the overriding North American plate advanced toward its subduction zone as the Atlantic Ocean opened. The initial propagation of magmatic arcs along the western margin of Laurentia (ca. 400-360 Ma) coincided with the final...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2014
GSA Bulletin (2014) 126 (11-12): 1531-1550.
... of the Craig subterrane, thus identifying the oldest known geological tie between Wrangellia and the Alexander terrane. The Late Devonian continental arc extended south (present coordinates) into an oceanic realm, beyond the limits of the Craig subterrane, and generated the Sicker arc system of southern...
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Journal Article
Journal: Geosphere
Published: 01 February 2010
Geosphere (2010) 6 (1): 47-73.
... submerged arc crust. There are distinct differences in volcanic stratigraphy and basement composition between Northern and Southern Wrangellia. On Vancouver Island, ∼6 km of high-Ti basalts, with minor amounts of picrites, record an emergent sequence of pillow basalt, pillow breccia and hyaloclastite...
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Journal Article
Journal: Lithosphere
Published: 01 October 2014
Lithosphere (2014) 6 (5): 383-398.
... of the Farewell terrane. Sedimentary facies consist of high- and low-density sediment-gravity-flow deposits and are interpreted to represent a submarine fan depositional system. Sandstone modal composition trends show a relative abundance of lithic volcanic fragments (∼65%) and subordinate occurrences of lithic...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP318.10
EISBN: 9781862395664
... with marked peaks in the 1.8–2.0 Ga range, and distributions into the Archaean and in some cases minor grains in the range 1.0–1.3 Ga; the latter are considered to represent very distal Grenvillian detritus ( Rainbird et al. 1997 ; Fig.  4 ). (3) Continental arc magmatism commenced in Middle to Late...
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Journal Article
Published: 06 October 2016
Canadian Journal of Earth Sciences (2017) 54 (3): 322-344.
... both terranes represent initiation of extension in a back arc to the Pennsylvanian to Permian SkolaiSicker arc that was in part built on the Alexander terrane beginning in the Late Devonian. Fig. 1. ( a ) Terrane map of northern Cordillera in western Canada and Alaska. ( b ) Inset map shows...
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