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plutons that intruded it (Tagish Lake suite) as part of
Stikinia has implications for the age and character of the Stikinia–Tracy Arm terrane boundary because the Boundary Ranges and Tagish Lake suites form the footwall of a major Middle Jurassic shear zone that carried the continental margin–like
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rocks of the Tracy Arm terrane in its hanging wall. This correlation also implies that the late
Paleozoic basement to the Mesozoic Stikinia arc is not a continental margin assemblage, at least as far north as the British Columbia–Yukon border, and possibly farther.
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Stikinia (in blue) at 330, 269, and 251 Ma, or before the breakup of
Pangaea. At 269 Ma Stikinia is accompanied by the Wrangellia and Alexander terranes (west) and the East Klamath terrane (southeast). View centred on 60th meridian
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The following correlations have significant implications for tectonic reconstructions of the northern
Cordillera because they suggest that Stikinia's Paleozoic volcanic-sedimentary basement is more widespread than previously thought.
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areas. In contrast, Mesozoic
Stikinia rocks form a near-continuous belt that extends much farther to the north, leading some authors to question the nature of the unexposed Paleozoic basement north of the Taku River area.
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Until recently the
Paleozoic rocks that form a non-continuous belt along the western margin of the NCVP (the Stikine assemblage) were only recognized in a restricted area in northern British Columbia, between the
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Gagnon, J. F.; Barresi, T.; Waldron, J. W.; Nelson, J. L.; Poulton, T. P.; Cordey, F. (2012). "Stratigraphy of the upper
Hazelton Group and the Jurassic evolution of the Stikine terrane, British Columbia".
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in west-central
British Columbia. Differences in the isotopic signatures of these rocks may reflect along-strike changes in the character of the basement rocks of the late Paleozoic Stikinia volcanic arc.
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Currie, L.; Parrish, R. R. (1993). "Jurassic accretion of
Nisling terrane along the western margin of Stikinia, Coast Mountains, northwestern British Columbia".
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The
Boundary Ranges suite, and therefore the Stikine assemblage, are also tentatively correlated with parts of the
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Stikinia forms the bedrock of numerous volcanoes in the southern portion of the
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area, north of the Taku River and south of the Yukon–British Columbia border.
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On the basis of similar rock types and lithologic associations, six new
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area), parts of the Taku terrane in southeast Alaska, and undivided
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suite, a metamorphosed Paleozoic volcanic assemblage exposed in the
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10.1130/0016-7606(1997)109<1402:PAMROS>2.3.CO;2
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Pages displaying short descriptions of redirect targets
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The recognition of the Boundary Ranges suite and the
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Fragment of Earth's crust in British Columbia, Canada
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Pages displaying wikidata descriptions as a fallback
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85:. It formed as an independent, intraoceanic
157:relationship with 184–195 million year old
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102:Northern Cordilleran Volcanic Province
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214: – Volcanic activity in Canada
311:Canadian Journal of Earth Sciences
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272:, abstract; Introduction, p. 1028
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221:Volcanology of Western Canada
343:Geology of British Columbia
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258:Currie & Parrish 1993
151:uranium-lead zircon dates
115:that has its origins in
212:Volcanology of Canada
81:; the largest of the
182:Yukon–Tanana Terrane
353:Paleozoic volcanism
117:continental rifting
83:Canadian Cordillera
358:Mesozoic volcanism
270:Gagnon et al. 2012
323:10.1139/e2012-042
190:metamorphic rocks
153:, and the common
113:geologic province
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348:Geology of Yukon
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317:(9): 1027–1052.
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75:British Columbia
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203:Takla Group
167:Tagish Lake
89:during the
337:Categories
260:, Abstract
227:References
184:in Yukon (
134:Taku River
104:(NCVP), a
155:intrusive
145:Formation
91:Paleozoic
65:, or the
363:Terranes
197:See also
174:Jurassic
110:Holocene
95:Mesozoic
63:Stikinia
289:Geology
280:Sources
159:plutons
106:Miocene
71:terrane
69:, is a
123:Extent
79:Canada
232:Notes
56:west.
132:and
93:and
319:doi
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108:to
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