Transitional basalts from the eastern Australian tertiary province

Green D.C. (1969) Transitional basalts from the eastern Australian tertiary province. Bulletin Volcanologique, 33 3: 930-941. doi:10.1007/BF02596757


Author Green D.C.
Title Transitional basalts from the eastern Australian tertiary province
Journal name Bulletin Volcanologique   Check publisher's open access policy
ISSN 0366-483X
Publication date 1969-01-01
Sub-type Article (original research)
DOI 10.1007/BF02596757
Open Access Status Not yet assessed
Volume 33
Issue 3
Start page 930
End page 941
Total pages 12
Subject 1908 Geophysics
1906 Geochemistry and Petrology
Abstract Study of Tertiary volcanic rocks from Mt. Tamborine in S. E. Queensland, Australia, suggests that some basalts from the large Tweed vent are intermediate in character between true tholeiites and well documented alkaline basalts of the Australian Tertiary province. Geochemical evidence and comparison with synthetic systems suggests that the transitional lavas are derived by continuous fractional crystallization during the ascent of a parent magma produced by substantial partial melting of the upper mantle at moderate depths and pressures. Alkaline basalts that underlie the transitional basalts are the result of relatively rapid, intermittent extrusion of magma generated by a smaller degree of partial melting of the upper mantle. This interpretation resolves the difficulties posed by an apparent inversion of the usual stratigraphic relationship of tholeiites capped by alkali basalts, and is in accord with recent seismic studies of the continental margin of eastern Australia.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 28 Jun 2016, 14:52:05 EST by System User