Correlation of Settler Schist with Darrington Phyllite and Shuksan Greenschist and its tectonic implications, Coast and Cascade mountains, British Columbia and Washington

1991 ◽  
Vol 28 (3) ◽  
pp. 447-458 ◽  
Author(s):  
J. W. H. Monger
Keyword(s):  
British Columbia ◽  
Composition Range ◽  
Cascade System ◽  
Cascade Mountains ◽  
Coast Mountains ◽  
Southeastern Coast ◽  
Irregular Structures ◽  
Metamorphic Core ◽  
Early Late ◽  
Cretaceous Subduction

Amphibolite-facies Settler Schist in the southeastern Coast Mountains of British Columbia has long been correlated with Chiwaukum Schist of the Cascade metamorphic core, North Cascade Mountains, northwestern Washington. The additional correlation proposed here of Settler Schist with Darrington Phyllite and Shuksan Greenschist (and blueschist) of the Northwest Cascade System in Washington is based on along-strike near-continuity of outcrop areas, a similar protolith composition range, the same structural position relative to the Shuksan fault zone, and distinctive irregular structures in variably metamorphosed sandstone and pelite of both Darrington Phyllite and Settler Schist. If this correlation is valid, then the record of Early Cretaceous; subduction-related blueschist metamorphism of Shuksan–Darrington rocks was destroyed in Settler Schist by overprinting by early Late Cretaceous Barrovian metamorphism; only some distinctive, premetamorphic structures remain. The implication is that within the southeastern Coast Mountains, a cryptic record of subduction is overprinted by Barrovian metamorphism.

Coquitlam Drift: a pre-Vashon Fraser glacial formation in the Fraser Lowland, British Columbia

1981 ◽  
Vol 18 (9) ◽  
pp. 1443-1451 ◽  
Author(s):  
Stephen R. Hicock ◽  
John E. Armstrong
Keyword(s):  
British Columbia ◽  
Glacial Maximum ◽  
Cascade Mountains ◽  
Short Pulses ◽  
Coast Mountains ◽  
The North ◽  
Glaciomarine Sediments

Coquitlam Drift is formally defined and stratotypes established for it in the Coquitlam – Port Moody area, B.C. It is a Pleistocene formation consisting of till, glaciofluvial, ice-contact, and glaciomarine sediments deposited between 21 700 and 18 700 years BP, during the Fraser Glaciation (late Wisconsin) and prior to the main Vashon glacial maximum at about 14 500 years BP. The drift was deposited in short pulses by valley and piedmont glaciers fluctuating into the Fraser Lowland from the Coast Mountains to the north and Cascade Mountains to the east.

New radiocarbon dates for early deglaciation from the southeastern Coast Mountains of British Columbia

1989 ◽  
Vol 26 (10) ◽  
pp. 2169-2171 ◽  
Author(s):  
Catherine Souch
Keyword(s):  
British Columbia ◽  
Organic Material ◽  
Lacustrine Sediments ◽  
Southern Coast ◽  
Radiocarbon Dates ◽  
Coast Mountains ◽  
Southeastern Coast ◽  
Creek Watershed

Basal dates obtained on organic material from postglacial lacustrine sediments from four lakes in the Kwoiek Creek watershed, southern Coast Mountains of British Columbia, provide minimum dates of deglaciation. The dates obtained (12 255 ± 770, 11 485 ± 185, 10 385 ± 595, and 9640 ± 380 BP), at elevations 835–1120 m, suggest that extensive areas of the mountains of southern British Columbia were ice free prior to 11 500 years ago. This has implications for models of the regional deglaciation of the southern portion of the province.

DURATION OF GARNET GROWTH AND P-T-T PATHS FROM SM-ND DATING AND ISOCHEMICAL PHASE DIAGRAMS: COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA, CANADA

2017 ◽  
Author(s):  
Elizabeth M. Bollen ◽  
◽  
Harold H. Stowell ◽  
Margaret E. Rusmore ◽  
Glenn J. Woodsworth
Keyword(s):  
British Columbia ◽  
Phase Diagrams ◽  
Garnet Growth ◽  
Coast Mountains

U-PB GEOCHRONOLOGY AND ZIRCON HF AND O ISOTOPE ANALYSIS OF PLUTONS OF THE SOUTHERN COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA: INSIGHT INTO EPISODIC MAGMATISM IN CONTINENTAL ARCS

2017 ◽  
Author(s):  
Emily C. Homan ◽  
◽  
M. Robinson Cecil ◽  
George E. Gehrels ◽  
Margaret E. Rusmore ◽  
...  
Keyword(s):  
British Columbia ◽  
Isotope Analysis ◽  
Southern Coast ◽  
Coast Mountains ◽  
Continental Arcs ◽  
O Isotope ◽  
Insight Into

scholarly journals Along‐Strike Variation in the Magmatic Tempo of the Coast Mountains Batholith, British Columbia, and Implications for Processes Controlling Episodicity in Arcs

2018 ◽  
Vol 19 (11) ◽  
pp. 4274-4289 ◽  
Author(s):  
M. R. Cecil ◽  
M. E. Rusmore ◽  
G. E. Gehrels ◽  
G. J. Woodsworth ◽  
H. H. Stowell ◽  
...  
Keyword(s):  
British Columbia ◽  
Coast Mountains

III.—Recent Observations on the Glaciation of British Columbia and Adjacent Regions

1888 ◽  
Vol 5 (8) ◽  
pp. 347-350 ◽  
Author(s):  
Geo. M. Dawson
Keyword(s):  
British Columbia ◽  
Glacial Period ◽  
Coast Range ◽  
Coast Mountains ◽  
One Stage ◽  
Queen Charlotte Islands ◽  
Glacier Ice ◽  
Inland Ice ◽  
Great Valley ◽  
The U.S

Previous observations in British Columbia have shown that at one stage in the Glacial period—that of maximum glaciation—a great confluent ice-mass has occupied the region which may be named the Interior Plateau, between the Coast Mountains and Gold and Eocky Mountain Kanges. From the 55th to the 49th parallel this great glacier has left traces of its general southward or southeastward movement, which are distinct from those of subsequent local glaciers. The southern extensions or terminations of this confluent glacier, in Washington and Idaho Territories, have quite recently been examined by Mr. Bailley Willis and Prof. T. C. Chamberlin, of the U.S. Geological Survey. There is, further, evidence to show that this inland-ice flowed also, by transverse valleys and gaps, across the Coast Range, and that the fiords of the coast were thus deeply filled with glacier-ice which, supplemented by that originating on the Coast Range itself, buried the entire great valley which separates Vancouver Island from the mainland and discharged seaward round both ends of the island. Further north, the glacier extending from the mainland coast touched the northern shores of the Queen Charlotte Islands.

Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia

1998 ◽  
Vol 35 (5) ◽  
pp. 556-561 ◽  
Author(s):  
P J Patchett ◽  
G E Gehrels ◽  
C E Isachsen
Keyword(s):  
British Columbia ◽  
Volcanic Rocks ◽  
Metamorphic Rocks ◽  
Published Data ◽  
Isotopic Data ◽  
Crustal Component ◽  
Coast Mountains ◽  
Crustal Rocks ◽  
Metasedimentary Rocks ◽  
Plutonic Rocks

Nd isotopic data are presented for a suite of metamorphic and plutonic rocks from a traverse across the Coast Mountains between Terrace and Prince Rupert, British Columbia, and for three contrasting batholiths in the Omineca Belt of southern Yukon. A presumed metamorphic equivalent of Jurassic volcanic rocks of the Stikine terrane gives epsilon Nd = +6, and a number of other metaigneous and metasedimentary rocks in the core of the Coast Mountains give epsilon Nd values from +3 to +7. A single metasedimentary rock approximately 3 km east of the Work Channel shear zone gives a epsilon Nd value of -9. Coast Belt plutons in the traverse yield epsilon Nd from -1 to +2. The Omineca Belt plutons give epsilon Nd from -10 to -17. All results are consistent with published data in demonstrating that (i) juvenile origins for both igneous and metamorphic rocks are common in the Coast Belt; (ii) representatives of a continental-margin sedimentary sequence with Precambrian crustal Nd are tectonically interleaved in the Coast Mountains; (iii) Coast Mountains plutons can be interpreted as derived from a blend of metamorphic rocks like those seen at the surface, or as arc-type melts contaminated with the older crustal component; and (iv) Omineca Belt plutons are dominated by remelted Precambrian crustal rocks.

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