scholarly journals Preliminary Results of Shallow Drilling in the Garibaldi Volcanic Belt, British Columbia, 1982

10.4095/8921 ◽  
1983 ◽  
Author(s):  
W H Bentkowski ◽  
T J Lewis
Keyword(s):  
British Columbia ◽  
Volcanic Belt ◽  
Preliminary Results

scholarly journals PRELIMINARY RESULTS OF PALAEOMA GNETIC MEASUREMENTS OF TERTIARY-QUATERNARY IGNEOUS ROCKS FROM THE EASTERN PART OF THE TRANS MEXICAN VOLCANIC BELT

1981 ◽  
Vol 20 (3) ◽  
Author(s):  
H. Bohnel ◽  
J. F. W. Negendank
Keyword(s):  
Volcanic Belt ◽  
Igneous Rocks ◽  
Preliminary Results ◽  
Mexican Volcanic Belt ◽  
Trans Mexican Volcanic Belt

Resultados paleomagnéticos de aproximadamente 500 muestras orientadas colectadas en 59 sitios de la sección este del eje volcánico trans-Mexicano se presentan en este trabajo. Las rocas ígeneas estudiadas son del Plioceno y Cuaternario, con la excepción del macizo de Palma Sola, de edad Mioceno. Los resultados paleomagnéticos se usan para correlacionar con resultados geoquímicos y geológicos del área y con resultados paleomagnéticos de Norteamérica y México. Los resultados no indican moviemiento relativo significante entre Norteamérica y la sección central-este de México en el período estudiado.

A new locality for primary xenolith-bearing nephelinites in northwestern British Columbia

1985 ◽  
Vol 22 (10) ◽  
pp. 1556-1559 ◽  
Author(s):  
Michael D. Higgins ◽  
John M. Allen
Keyword(s):  
British Columbia ◽  
Trace Element ◽  
Volcanic Belt ◽  
Primary Magma ◽  
Similar Composition ◽  
Element Abundances ◽  
Late Tertiary

High Ni abundances (420–500 ppm) and Mg* values (100 × Mg/(Mg + Fe2+) = 69–71) and the presence of mantle-derived xenoliths indicate that a subvolcanic nephelinite intrusion in northwestern British Columbia represents an unmodified primary magma. A separate, closely associated nephelinite intrusion shows evidence of minor olivine fractionation from a similar composition. Only three other occurrences of primary nephelinite have been described. This new occurrence suggests that these magmas may not be so rare as previously supposed. The trace-element abundances closely resemble those of primary nephelinites of similar La content from Freemans Cove, Canada. Such compositions are usually taken as evidence of intraplate rifting and doming. Therefore, these rocks are further evidence of late Tertiary or Quaternary rifting in the Stikine volcanic belt.

scholarly journals The 2007 Nazko, British Columbia, Earthquake Sequence: Injection of Magma Deep in the Crust beneath the Anahim Volcanic Belt

2011 ◽  
Vol 101 (4) ◽  
pp. 1732-1741 ◽  
Author(s):  
J. F. Cassidy ◽  
N. Balfour ◽  
C. Hickson ◽  
H. Kao ◽  
R. White ◽  
...  
Keyword(s):  
British Columbia ◽  
Volcanic Belt ◽  
Earthquake Sequence

Eocene Challis-Kamloops volcanism in central British Columbia: an example from the Buck Creek basin

1998 ◽  
Vol 35 (8) ◽  
pp. 951-963 ◽  
Author(s):  
J Dostal ◽  
D A Robichaud ◽  
B N Church ◽  
P H Reynolds
Keyword(s):  
British Columbia ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Fractional Crystallization ◽  
Earth Element ◽  
Volcanic Rocks ◽  
Volcanic Belt ◽  
The United States ◽  
Calc Alkaline ◽  
Heavy Rare Earth Element

Eocene volcanic rocks of the Buck Creek basin in central British Columbia are part of the Challis-Kamloops volcanic belt extending from the United States across British Columbia to central Yukon. The volcanic rocks include two units, the Buck Creek Formation, composed of high-K calc-alkaline rocks with predominant andesitic composition, and the overlying Swans Lake unit made up of intraplate tholeiitic basalts. Whole rock 40Ar/39Ar data for both units show that they were emplaced at 50 Ma. They have similar mantle-normalized trace element patterns characterized by a large-ion lithophile element enrichment and Nb-Ta depletion, similar chondrite-normalized rare earth element patterns with (La/Yb)n ~4-14 and heavy rare earth element fractionation, and overlapping epsilonNd values (2.4-3.1) and initial Sr-isotope ratios ( ~ 0.704). These features suggest derivation of these two units from a similar mantle source, probably garnet-bearing subcontinental lithosphere. The differences between tholeiitic and calc-alkaline suites can be due, in part, to differences in the depth of fractional crystallization and the crystallizing mineral assemblage. Fractional crystallization of the calc-alkaline magmas began at a greater (mid-crustal) depth and included fractionation of Fe-Ti oxides. The volcanic rocks are probably related to subduction of the Farallon plate under the North American continent in a regime characterized by transcurrent movements and strike-slip faulting.

scholarly journals Geology of the Monmouth Creek volcanic complex, Garibaldi volcanic belt, British Columbia

2016 ◽  
Author(s):  
A M Wilson ◽  
J K Russell ◽  
M C Kelman ◽  
C J Hickson
Keyword(s):  
British Columbia ◽  
Volcanic Belt ◽  
Volcanic Complex

Geothermal measurements in northern British Columbia and southern Yukon Territory

1984 ◽  
Vol 21 (5) ◽  
pp. 599-608 ◽  
Author(s):  
Alan M. Jessop ◽  
J. G. Souther ◽  
Trevor J. Lewis ◽  
A. S. Judge
Keyword(s):  
British Columbia ◽  
Heat Flow ◽  
Heat Generation ◽  
Water Movement ◽  
Volcanic Belt ◽  
Yukon Territory ◽  
Eastern United States ◽  
Basin And Range Province ◽  
Probable Effect ◽  
Few Data

Measurements at seven sites in the Intermontane region of northern British Columbia and southern Yukon show heat flow of 63–100 mW/m2 and heat generation, obtained from intrusive rocks at three of these sites, of 1.8–6.5 μW/m1. These few data cannot define a linear relation between heat flow and heat generation for this region, but the plotted points lie between the lines of the stable crust of the eastern United States and of the Basin and Range Province. Conductive thermal models of the crust, assuming a basalt composition for the lower crust, predict at 35 km depth a heat flow of 30 mW/m2 and temperatures between 645 and 775 °C at most sites.At two sites conductive models based on reasonable properties do not yield reasonable temperatures. The site on the axis of the Stikine Volcanic Belt shows a probable component of convectively enhanced heat flow or the presence of a young intrusion at depth. The site in the Bowser Basin shows the probable effect of water movement in the sediments.

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