5 edition of Archean volcanic studies in the Timmins- Kirkland Lake - Noranda region of Ontario and Quebec found in the catalog.
|Statement||Dept. of Energy, Mines and Resources|
|Publishers||Dept. of Energy, Mines and Resources|
|The Physical Object|
|Pagination||xvi, 91 p. :|
|Number of Pages||56|
nodata File Size: 10MB.
The three 1975, 1978a,b, 1980; Goodwin 1979; Pyke 1973, phases are typically arranged in that ascending order. Anthony Lake fragmental unit is a polymict breccia of overall andesitic composition. Les coulkes de lave tholkiitique TH ainsi que les coulkes de lave komatiitique KM et les intrusions prkdominent dans les niveaux infkrieurs de chaque volcan et des coultes de lave calco-alcaline CA ou des roches pyroclastiques occupent les niveaux supkrieurs.
The lower TH basalt flow division zones b-c2000 m thick, compares closely iri chemical composition, although somewhat more variable, with the middle to upper part of the lower Skead division. Suitable zonal accommodations are required for a multicyclic volcano, e.Amsterdam -- Printed in The Netherlands AN ARCHEAN VOLCANIC--EXHALATIVE SYSTEM ADJACENT TO A TRONDHJEMITE STOCK NEAR WAWA, ONTARIO PAUL A. La succession volcanique gknkralis6e de I'Abitibi reprksente un strato-volcan simplifik.
The great concentration of rhyolite in the Noranda area demonstrates that it was a major locus of felsic effusion. In the Blake River Group, andesites are mainly lava flows whereas in the Skead and Redstone River Groups they are largely pyroclastic.SANSCHAGRIN, New York, NY, pp.
and petrogenesis of the central Noranda volcanic pile, GREEN,D. ,Blake River, the main framework elements being common to all. Lava flows 200 m thick and at least lOkm by 35 km in original horizontal dimensions are Pillowed flows 35 38 46 Massive units 24 33 38 common. The three phases have The proportions of massive to pillowed and brecciated I TABLE1. The TH units are mainly subaqueous basalt lava flows with minor interbedded metasedimentary rocks.
The samples, which include mafic trachytes, trachytes and leucite trachytes, represent several batches of Archean alkalic magmas differentiated at shallow depths.
Proposed correlations are shown in Figure 2. There is a strong structural control of the gold-bearing quartz veins systms within each of the striking high-strain zones within the deformation zone.
Lower Skead evolution is characterized by comparatively uniform TH basalt extrusion and upper Skead by CA andesite-daciterhyolite fluctuations, becoming increasingly siliceous with stratigraphic height.
The three phases have The proportions of massive to pillowed and brecciated I TABLE1.
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Salient controls in volcano development are attributed to local crustal sag upon a rising diapir within a heterogeneously layered Archean mantle Capdevila et al.
Precambrian - Precambrian - Precambrian geology: By international agreement, Precambrian time is divided into the Archean Eon occurring between roughly billion years ago and billion years ago and Proterozoic Eon occurring between billion and million years ago.
The building houses several geology-related research centres such as the Ontario Geological Survey, the Ontario Geoscience Laboratories Geo Labs , and the Ontario Ministry of Northern Development and Mines.