Geochemistry of Archean alkalic volcanic rocks from the Crystal Lake area, east of Kirkland Lake, Ontario, Canada

Details Geochemistry of Archean alkalic volcanic rocks from the Crystal Lake area, east of Kirkland Lake, Ontario, Canada Geochemistry of Archean alkalic volcanic rocks from the Crystal Lake area, east of Kirkland Lake, Ontario, Canada

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73..333u&link_type=abstract

Earth and Planetary Science Letters, Volume 73, Issue 2-4, p. 333-344.

Physics

5

Scientific paper

Twelve samples of Timiskaming volcanics from the Crystal Lake area were analyzed for major and trace elements (Ta, Th, Zr, Hf, V, Cr, Sc, rare earth elements (REE), Y, etc.) by X-ray fluorescence and instrumental neutron activation analysis techniques. The samples, which include mafic trachytes, trachytes and leucite trachytes, represent several batches of Archean alkalic magmas differentiated at shallow depths. The Cr/Sc-Cr systematics and REE, Zr-Th and Zr-Y characteristics show, however, that their primary magmas generated at great depths in the ``enriched'' mantle where garnet remained in the refractory residue of partial melt. The chemical similarity between the Timiskaming samples and modern alkalic rocks in mature volcanic arcs strongly implies that the Timiskaming volcanism represents the last stage of a late Archean island arc volcanism present in the southwestern Abitibi Belt, Superior Province. The occurrence of Timiskaming-type alkalic rocks is not rare in Archean greenstone belts, thereby suggesting that a tectonic setting similar to modern volcanic arc system might have been common in late Archean time.
Present address: Department of Earth Sciences, University of Toyama, Gofuku, Toyama, 930 Japan.

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