scholarly journals Stratigraphy and structure of the Upper Arrow Lake area, southeastern British Columbia: new perspectives for the Columbia River Fault Zone

2003 ◽  
Author(s):  
Y Lemieux ◽  
R I Thompson ◽  
P Erdmer
Keyword(s):  
British Columbia ◽  
Fault Zone ◽  
Columbia River ◽  
Lake Area

Kinematic interpretation of mylonitic rocks in part of the Columbia River fault zone, Shuswap terrane, British Columbia

1982 ◽  
Vol 19 (3) ◽  
pp. 456-465 ◽  
Author(s):  
Richard L. Brown ◽  
Donald C. Murphy
Keyword(s):  
British Columbia ◽  
Fault Zone ◽  
Hanging Wall ◽  
Regional Metamorphism ◽  
Columbia River ◽  
Coarse Grained ◽  
Thick Section ◽  
Mylonite Zone ◽  
Relationship Of ◽  
Igneous Texture

Mylonitic rocks of the Columbia River fault zone have been examined in a 600 m thick section, 20 km north of Revelstoke, British Columbia. At this locality coarse-grained granite with well-preserved igneous texture lies in the hanging wall of the fault zone. Adjacent to the boundary of the mylonite zone the granite is foliated and mineral segregation gives rise to well-defined compositional layering. The foliation (Sf) is defined by oriented mineral grains and flattened porphyroclasts. In areas of intense strain compositional layering (Sc) is parallel to Sf. At the boundary of the mylonite zone and in weakly deformed areas within the mylonite zone Sc and Sf are inclined at angles up to 30°. Sf is taken to be a plane of flattening, and Sc appears to parallel a plane of shear. After correction for effects of late-stage flexural slip folding the angular relationship of Sc to Sf may be used to determine sense of shear in the mylonitc zone; the hanging-wall rocks have been displaced toward the east relative to the footwall. Formation of mylonitic fabrics and associated displacement of the Selkirk allochthon eastward relative to the underlying Monashee Complex occurred after the Middle Jurassic peak of regional metamorphism and before brittle reactivation and uplift in the Tertiary.

Rare earth element concentrations in Quaternary volcanic rocks of southwestern British Columbia

1984 ◽  
Vol 21 (6) ◽  
pp. 731-736 ◽  
Author(s):  
Nathan L. Green ◽  
Paul Henderson
Keyword(s):  
British Columbia ◽  
Earth Element ◽  
Volcanic Rocks ◽  
Crustal Contamination ◽  
Lake Area ◽  
Calc Alkaline ◽  
Lower Light ◽  
The Individual ◽  
High Level ◽  
Ree Patterns

A suite of hy-normative hawaiites, ne-normative mugearite, and calc-alkaline andesitic rocks from the Garibaldi Lake area exhibits fractionated, slightly concave-upward REE patterns (CeN/YbN = 4.5–15), heavy REE contents about 5–10 times the chondritic abundances, and no Eu anomalies. It is unlikely that the REE patterns provide information concerning partial melting conditions beneath southwestern British Columbia because they have probably been modified substantially by upper crustal processes including crustal contamination and (or) crystal fractionation. The REE contents of the Garibaldi Lake lavas are not incompatible with previous interpretations that (1) the hawaiites have undergone considerable fractionation of olivine, plagioclase, and clinopyroxene; and (2) the individual andesitic suites were derived from separate batches of chemically distinct magma that evolved along different high-level crystallization trends. In general, however, the andesites are characterized by lower light REE contents than the basaltic andesites. These differences in LREE abundances may reflect different amounts of LREE-rich accessory phases, such as apatite, sphene, or allanite, assimilated from the underlying quartz diorites.

Downie Slide, Columbia River, British Columbia, Canada

1978 ◽  
pp. 365-392 ◽  
Author(s):  
D.R. PITEAU ◽  
F.H. MYLREA ◽  
I.G. BLOWN
Keyword(s):  
British Columbia ◽  
Columbia River

Gold placers of Dease Lake area, Cassiar District, British Columbia

1926 ◽  
Author(s):  
W A Johnston
Keyword(s):  
British Columbia ◽  
Lake Area
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