Physics
Scientific paper
Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972e%26psl..15..191h&link_type=abstract
Earth and Planetary Science Letters, vol. 15, Issue 2, pp.191-200
Physics
7
Scientific paper
Recent studies in Archaean volcanic belts of the Eastern Goldfields region of Western Australia have led to the development of a general picture of Archaean volcanic activity in this area. Three volcanic associations are recognized: a felsic volcanic-porphyry-clastic and volcanogenic sediment association, a pillow basalt-dolerite association and an ultramafic association. The ultramafic association consists of high-Mg basalts and zoned ultramafic lenses, both with textures indicative of high level intrusion or extrusion, and numerous small layered sills. The association commonly forms the lower parts of individual volcanic sequences, and is overlain by basalt. In some areas felsic volcanic rocks terminate this sequence. It is believed that the mafic and ultramafic associations represent two distinct magma sources. Elements of similarity between these stratiform belts and more recent oceanic crust are discussed.
Hallberg J. A.
Williams A. C. D.
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