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Clinopyroxenes from deep sea basalts: A statistical analysis
Author(s) -
Schweitzer E. L.,
Papike J. J.,
Bence A. E.
Publication year - 1978
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl005i007p00573
Subject(s) - pyroxene , basalt , geology , geochemistry , mineralogy , analytical chemistry (journal) , chemistry , olivine , environmental chemistry
Pyroxene analyses of superior quality, from DSDP Legs 11, 15, 17, 34 and 37 have been studied statistically using cluster and factor analysis. These techniques are used to identify the various basalt groups using pyroxene chemistry, and to gain information about pyroxene crystal chemistry. The tholeiitic and alkalic pyroxene groups differ primarily in Cr 2 O 3 , TiO 2 , and Na 2 O contents. Relative to an average deep sea pyroxene, the tholeiitic pyroxenes are enriched in Cr 2 O 3 and depleted in TiO 2 and Na 2 O, while the alkalic pyroxenes are depleted in Cr 2 O 3 and enriched in TiO 2 and Na 2 O. The primary substitutional couples for the two groups are: VI Ti‐ IV Al 2 and VI Fe 3+ ‐ IV Al.