New Pennsylvanian(?) syringoporid coral from Kamloops area, British Columbia

1982 ◽  
Vol 19 (2) ◽  
pp. 376-380 ◽  
Author(s):  
Samuel J. Nelson
Keyword(s):  
British Columbia ◽  
Host Rock ◽  
Late Paleozoic ◽  
Western Cordillera ◽  
Hills Area

The first described late Paleozoic syringoporid coral in the Canadian Western Cordillera, Sinopora pascuali sp.nov., is from the Dome Hills area, near Kamloops, British Columbia. It has strong Asiatic affinities. The age of the host rock is considered earliest Pennsylvanian(?).

Possible Early Paleozoic coral, Intermontane Belt, south-central British Columbia

1980 ◽  
Vol 17 (2) ◽  
pp. 266-268
Author(s):  
Samuel J. Nelson
Keyword(s):  
British Columbia ◽  
Late Paleozoic ◽  
Early Paleozoic ◽  
Organic Structure ◽  
Western Cordillera ◽  
South Central

A possible organic structure resembling a halysitid coral was found in the Chapperon Group of south-central British Columbia, a unit generally considered of Late Paleozoic age. If it is such a coral, then it would be the oldest fossil so far found in the eugeosynclinal rocks of the Canadian Western Cordillera and could imply an Early Paleozoic eugeosyncline.

A Paleozoic Zircon Age of the Westcoast Crystalline Complex of Vancouver Island, British Columbia

1974 ◽  
Vol 11 (12) ◽  
pp. 1717-1722 ◽  
Author(s):  
J. E. Muller ◽  
R. K. Wanless ◽  
W. D. Loveridge
Keyword(s):  
British Columbia ◽  
Volcanic Rocks ◽  
Vancouver Island ◽  
Late Paleozoic ◽  
Basement Complex ◽  
Crystalline Complex ◽  
Zircon Age ◽  
Isotopic Evidence

Zircons from the Westcoast Crystalline Complex near Tofino, Vancouver Island, have yielded the following ages: 206Pb/238U = 265 ± 7 m.y.; 207Pb/235U = 263 ± 7 m.y.; and 206Pb/207Pb = 244 ± 20 m.y. A K–Ar date of an amphibolized dike from the same outcrop yielded 192 ± 9 m.y. This is the first supporting isotopic evidence that the 'basement' complex is derived from late Paleozoic Sicker volcanic rocks and was ultimately migmatized during the major Jurassic plutonic event of Vancouver Island.

Evidence for "Caribooan Orogeny" in the Southern Okanagan Region of British Columbia

1972 ◽  
Vol 9 (12) ◽  
pp. 1693-1702
Author(s):  
John V. Ross ◽  
William C. Barnes
Keyword(s):  
British Columbia ◽  
Sedimentary Rocks ◽  
Late Paleozoic ◽  
Deformational History ◽  
Exposed Part ◽  
Strong Deformation ◽  
Paleozoic Rocks ◽  
Okanagan Valley

A sequence of non-metamorphosed, little deformed, fossiliferous, sedimentary rocks, near Keremeos, southern British Columbia, unconformably overlies rocks having a history similar to that of the Vaseaux Formation, the most westerly exposed part of the Shuswap Complex of the southern Okanagan Valley. Fossils from the younger sequence have a late Mississippian – early Pennsylvanian age.This part of the southern Okanagan region has a deformational history that is pre-mid-Carboniferous and likely related to the Caribooan orogeny. This is in contrast to Late Paleozoic rocks at northern Okanagan localities and elsewhere in British Columbia that have under-gone strong deformation of probably Mesozoic age.

Galena-Bearing Pyrite Nodules in the Nelway Formation, Salmo, British Columbia

1974 ◽  
Vol 11 (4) ◽  
pp. 495-502 ◽  
Author(s):  
Joseph W. Mills
Keyword(s):  
British Columbia ◽  
Low Temperature ◽  
Host Rock ◽  
Ore Deposits ◽  
Middle Cambrian ◽  
Stratigraphic Position

Pyrite nodules composed of radiating elongate pyrite crystals and including some galena are found in the sparry dolomite matrix of a dolomite breccia within the middle Cambrian Nelway Formation, Salmo map-area, British Columbia.Similar textures, mineralogy, host rock, and stratigraphic position for the nodules and some pyritic zinc-lead ores in northeastern Washington are taken to indicate a common lineage. Favored is an hypothesis calling for the formation of solution-collapse breccias and their filling by dolomite and sulfides precipitated from low temperature solutions. Later deformation and metamorphism erased or concealed the record of these early events in many of the ore deposits.

The Great Tonalite Sill of southeastern Alaska and British Columbia: emplacement into an active contractional high angle reverse shear zone (extended abstract)

1992 ◽  
Vol 83 (1-2) ◽  
pp. 383-386 ◽  
Author(s):  
Donald H. W. Hutton ◽  
Gary M. Ingram
Keyword(s):  
British Columbia ◽  
Metamorphic Grade ◽  
High Grade ◽  
Metamorphic Complex ◽  
High Angle ◽  
Western Margin ◽  
Western Cordillera ◽  
Early Tertiary ◽  
The World ◽  
Gravina Belt

The Great Tonalite Sill (GTS) of southeastern Alaska and British Columbia (Brew & Ford 1981; Himmelberg et al. 1991) is one of the most remarkable intrusive bodies in the world: it extends for more than 800 km along strike and yet is only some 25 km or less in width. It consists of a belt of broadly tonalitic sheet-like plutons striking NW–SE and dipping steeply NE, and has been dated between 55 Ma and 81 Ma (J. L. Wooden, written communication to D. A. Brew, April 1990) (late Cretaceous to early Tertiary). The sill (it is steeply inclined and rather more like a “dyke”) is emplaced along the extreme western margin of the Coast Plutonic and Metamorphic Complex (CPMC), the high grade core of the Western Cordillera. The CPMC forms the western part of a group of tectonostratigraphic terranes including Stikine and Cache Creek, collectively known as the Intermontane Superterrane (Rubin et al. 1990). To the W of the GTS, rocks of the Insular Superterrane, including the Alexander and Wrangellia terranes and the Gravina belt, form generally lower metamorphic grade assemblages. The boundary between these two superterranes is obscure but it may lie close to, or be coincident with, the trace of the GTS.

Development of late Paleozoic volcanic arcs in the Canadian Cordillera: an example from the Klinkit Group, northern British Columbia and southern Yukon

2003 ◽  
Vol 40 (7) ◽  
pp. 907-924 ◽  
Author(s):  
Renée-Luce Simard ◽  
Jaroslav Dostal ◽  
Charlie F Roots
Keyword(s):  
British Columbia ◽  
North America ◽  
Volcanic Rocks ◽  
Late Paleozoic ◽  
Canadian Cordillera ◽  
Alkali Basalts ◽  
The North ◽  
Pacific Margin ◽  
North American Craton ◽  
Arc Setting

The late Paleozoic volcanic rocks of the northern Canadian Cordillera lying between Ancestral North America to the east and the accreted terranes of the Omineca belt to the west record early arc and rift magmatism along the paleo-Pacific margin of the North American craton. The Mississippian to Permian volcano-sedimentary Klinkit Group extends discontinuously over 250 km in northern British Columbia and southern Yukon. The two stratotype areas are as follows: (1) in the Englishman Range, southern Yukon, the English Creek Limestone is conformably overlain by the volcano-sedimentary Mount McCleary Formation (Lower Clastic Member, Alkali-Basalt Member and Volcaniclastic Member), and (2) in the Stikine Ranges, northern British Columbia, the Screw Creek Limestone is conformably overlain by the volcano-sedimentary Butsih Formation (Volcaniclastic Member and Upper Clastic Member). The calc-alkali nature of the basaltic volcaniclastic members of the Klinkit Group indicates a volcanic-arc setting ((La/Yb)N = 2.77–4.73), with little involvement of the crust in their genesis (εNd = +6.7 to +7.4). Alkali basalts in the Mount McCleary Formation ((La/Yb)N = 12.5–17.8) suggest periodic intra-arc rifting events. Broadly coeval and compositionally similar volcano-sedimentary assemblages occur in the basement of the Mesozoic Quesnel arc, north-central British Columbia, and in the pericratonic Yukon–Tanana composite terrane, central Yukon, suggesting that they all represent pieces of a single long-lived, late Paleozoic arc system that was dismembered prior to its accretion onto Ancestral North America. Therefore, Yukon–Tanana terrane is possibly the equivalent to the basement of Quesnel terrane, and the northern Quesnel terrane has a pericratonic affinity.

scholarly journals Late Cretaceous to Paleocene Tectonometamorphic Evolution of the Blanchard River Assemblage, Southwest Yukon: New Insight into the Terminal Accretion of Insular Terranes in the Northern Cordillera

Lithosphere ◽  
2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Lianna Vice ◽  
H. Daniel Gibson ◽  
Steve Israel
Keyword(s):  
British Columbia ◽  
Late Cretaceous ◽  
Amphibolite Facies ◽  
Contact Metamorphism ◽  
Northern Coast ◽  
Coast Mountains ◽  
Tectonic Events ◽  
Western Cordillera ◽  
History Of ◽  
Northwestern North America

Abstract The Intermontane-Insular terrane boundary stretches over 2000 kilometers from British Columbia to Alaska in the western Cordillera. Juxtaposed between these terranes is a series of Jura-Cretaceous basinal and arc assemblages that record a complicated and contested tectonic evolution related to the Mesozoic-Paleocene accretionary history of northwestern North America. In southwest Yukon, west-verging thrust faults facilitated structural stacking of the Yukon-Tanana terrane over these basinal assemblages, including the Early Cretaceous Blanchard River assemblage. These previously undated compressional structures are thought to be related to the final collapse of the Jura-Cretaceous basins and the tectonic burial of the Blanchard River assemblage resulting in amphibolite facies metamorphism. New in situ U-Th-Pb monazite ages record at least three tectonic events: (1) the tectonic burial of the Blanchard River assemblage to amphibolite facies conditions between 83 and 76 Ma; (2) peak burial was followed by regional exhumation at ca. 70-68 Ma; and (3) intense heating and ca. 63-61 Ma low-pressure contact metamorphism attributed to the intrusion of the voluminous Ruby Range suite, which is part of the northern Coast Mountains batholith. The tectonometamorphic evolution recorded in the Blanchard River assemblage can be correlated to tectonism within southwest Yukon and along the length of the Insular-Intermontane boundary from western British Columbia through southwestern Yukon and Alaska. In southwest Yukon, these results suggest an asymmetric final collapse of Jura-Cretaceous basins during the Late Cretaceous, which relates to the terminal accretion of the Insular terranes as they moved northward.

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