Authors / CoAuthors
Wilson, I.H.
Abstract
A systematic examination of multivariate geochemical data for two predominantly felsic volcanic units from the Proterozoic of the Mount Isa region, the Leichhardt Metamorphics (1865 Ma) and the Argylla Formation (1777 Ma), has established practical criteria to distinguish these units. The criteria are applied to volcanics from the Ewen Block, Wonga Belt, and Bottletree Formation, which have been difficult to correlate using lithologic and structural criteria. Histograms provide limited discrimination, because of the large range of most elements. Variation diagrams using Si02 as the independent variable allow clear distinction of the two formations to be made from their relative abundances of Ti, AI, Fe, K , Ce, Cr, Nb, Pb, Sr, Th, Y, and Zr at any particular SiO content. An examination of ratios of elements with similar chemical properties effectively distinguishes the two formations. The similarity coefficient and discriminant analysis allow classification of the two formations and are of use in assigning analyses of unknown specimens. All techniques indicate that the Ewen Block volcanics are probably Leichhardt Metamorphics and that the Wonga Belt and Bottletree Formation specimens more closely resemble the Argylla Formation. The higher CaO, Sr, and Pb, and lower K20 distinguish the Bottletree Formation from the Argylla Formation and support its status as a separate formation.
Product Type
document
eCat Id
81139
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- GA PublicationJournal
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- QLD
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1983-01-01T00:00:00
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Topic Category
geoscientificInformation
Series Information
BMR Journal of Australian Geology and Geophysics 8:2:109-117
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Unknown
Parent Information
Extents
[-22.5, -18.0, 138.0, 141.0]
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Spatial Resolution
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