136:) closed between the western margin of the Slave craton and Hottah terrane. The Great Bear magmatic arc remained active 1.88–1.84 Ma while subduction still occurred and still bisects the Hottah terrane north to south. The Coronation margin final closure occurred at 1.74 Ga. The date for the opening of the Coronation Ocean is uncertain, but isotopic studies indicate that initial rifting must be older than about 1.97 Ga. The Hottah arc formed 2.4–2.0 Ga on cryptic crust, probably coeval with sedimentation of Coronation margin. The closure of Coronation Ocean saw an initial phase of westward-directed subduction of oceanic crust beneath the Hottah terrane. This process was followed by an interrupted eastward subduction around 1.885 Ga during which the Coronation margin and Hottah terrane were translated eastward and partially thrust over the Slave craton.
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between the Slave craton and the Hottah terrane. No
Archean crust have been found west of this suture. The Great Bear magmatic zone is the result of arc magmatism around 1875–1840 Ma when these rocks were deposited on and intruded into the Hottah terrane and Slave craton. The magmatic arc now
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indicate that the same forces at work today have been at work in the early
Proterozoic and probably earlier. Alignments of magnetic particles in rocks demonstrate that continents were drifting across the surface of the Earth relative to the magnetic poles then as now, and that the ocean floor was
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It is approximately 500 km along the north–south axis, and 200 km along the east–west axis at its widest point, tapering at both the northern and southern ends.
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forms a 3–4.5 km thick basin overlying the Hottah-Slave transition. The cryptic Hottah terrane is a magmatic arc which consists of a 1936–1890 Ma-old suite of
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intruded into 2.0–2.4 Ga metamorphosed sedimentary and volcanic rocks. It probably extends east beneath the Great Bear magmatic zone.
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200:"Comparisons of the 2005 Geologic Map of North America with the 1965 Map, Areas 1-4; Area 2, Northwestern Canadian Shield"
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The Wopmay orogen can be subdivided into (east to west): a passive continental margin, the Wopmay fault zone, the
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460:"Geoelectric structure of the Proterozoic Wopmay orogen and adjacent terranes, Northwest Territories, Canada"
415:"Lithospheric geometry of the Wopmay orogen from a Slave craton to Bear Province magnetotelluric transect"
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rifting and subducting, all at least 1.5 billion years ago. This crust cycling is referred to as the
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The Wopmay orogen formed 1882±4 Ma when the
Coronation paleocean (named after the Arctic
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383:"Birthdate for the Coronation paleocean: age of initial rifting in Wopmay orogen, Canada"
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340:"The Calderian orogeny in Wopmay orogen (1.9 Ga), northwestern Canadian Shield"
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Spratt, J. E.; Jones, A. G.; Jackson, V. A.; Collins, L.; Avdeeva, A. (2009).
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at about 1.88 Ga (billion years). The collision lead to the short-lived
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Hoffman, P. F.; Bowring, S. A.; Buchwaldt, R.; Hildebrand, R. S. (2011).
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Sites such as the Wopmay Orogen provide evidence for early and ongoing
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Geological map of north-western Canada. Wopmay orogen marked with D.
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507:"Geological map showing the Slave Craton and the Wopmay Orogen"
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Hildebrand, R. S.; Hoffman, P. F.; Bowring, S. A. (2010).
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255:, Geological and geophysical setting, pp. 957–958
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204:Geology and Environmental Change Science Center
458:Wu, X.; Ferguson, I. J.; Jones, A. G. (2005).
53:which formed during the collision between the
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422:Journal of Geophysical Research: Solid Earth
85:(April 20, 1896 – June 21, 1952), a
27:Mountain-building event in northern Canada
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267:The Field Guide to Geology, New Edition
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347:Geological Society of America Bulletin
299:The Earth Through Time, Eighth Edition
187:Hildebrand, Hoffman & Bowring 2010
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546:Geology of the Northwest Territories
464:Canadian Journal of Earth Sciences
387:Canadian Journal of Earth Sciences
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273:: Checkmark Books. p. 184.
231:, Geology and Tectonics, pp. 2–4
515:United States Geological Survey
208:United States Geological Survey
73:. The formation was named for
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253:Wu, Ferguson & Jones 2005
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541:Paleoproterozoic orogenies
536:Orogenies of North America
113:Great Bear magmatic zone
265:Lambert, David (2007).
96:and a leading post-war
297:Levin, Harold (2006).
75:Wilfrid Reid "Wop" May
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521:on September 9, 2012.
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443:10.1029/2007JB005326
163:supercontinent cycle
158:colliding continents
476:2005CaJES..42..955W
434:2009JGRB..114.1101S
359:2010GSAB..122..794H
323:Retrieved May 2016.
241:Hoffman et al. 2011
243:, pp. 282–283
229:Spratt et al. 2009
128:Tectonic evolution
107:Geological setting
65:, and the Archean
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280:978-0-8160-6510-3
71:Calderian orogeny
61:), a continental
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519:the original
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140:Significance
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67:Slave Craton
63:magmatic arc
49:in northern
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303:Hoboken, NJ
154:island arcs
59:Hottah Lake
530:Categories
319:B002T8RFSQ
189:, Abstract
169:References
90:flying ace
511:usgs.gov
307:J. Wiley
87:Canadian
472:Bibcode
430:Bibcode
355:Bibcode
331:Sources
122:plutons
98:aviator
92:in the
489:22 May
449:22 May
404:22 May
372:22 May
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214:22 May
210:(USGS)
156:, and
117:suture
51:Canada
418:(PDF)
343:(PDF)
174:Notes
42:is a
491:2016
451:2016
406:2016
374:2016
315:ASIN
275:ISBN
216:2016
38:The
480:doi
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363:doi
351:122
83:DFC
79:OBE
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