Title: Chemical distinction between igneous and metamorphic orthopyroxenes especially those coexisting with Ca-rich clinopyroxenes: a re-evaluation
Abstract: Abstract A previously suggested simple relationship in a diagram of(Al 2 O 3 vs. MgO + FeO + Fe 2 O 3 ) opx for the distinction between igneous and metamorphic orthopyroxenes is shown to be inadequate. A revised diagram is presented and its limitations are discussed. A diagram showing Fe 2+ /(Fe 2+ + Mg) vs. 100Ca/(Fe 2+ + Mg + Ca) for orthopyroxenes coexisting with Ca-rich clinopyroxenes proves to be useful for the discrimination of igneous and metamorphic orthopyroxenes and for evaluation of the extent and physical conditions of regional orthopyroxene re-equilibration.
Publication Year: 1983
Publication Date: 1983-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 37
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