Al/Cr ratios of coexisting pyroxenes and spinellids in some ultramafic rocks

Eales, Hugh V; Marsh, Julian S

Title: Al/Cr ratios of coexisting pyroxenes and spinellids in some ultramafic rocks
Creator: Eales, Hugh V
Creator: Marsh, Julian S
Date Issued: 1983
Date: 1983
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/133534
Identifier: vital:36987
Identifier: https://doi.org/10.1016/0009-2541(83)90045-1
Description: Al/Cr atomic ratios of coexisting spinellids and ortho- and clinopyroxenes show a pattern of sympathetic variation that persists through ultramafic rocks of layered mafic complexes of upper-crustal type, Alpine complexes, and the nodules found in kimberlites and alkaline basalts. Simple expressions are empirically derived to link (Al/Cr) orthopyroxene and (Al/Cr)spinel ratios in putatively equilibrated rocks. Equivalence of spinel compositions in shallow layered complexes and kimberlite nodules of deep-seated origin negates direct crystallochemical control of Al/Cr ratios of spinels by pressure.
Format: 18 pages
Format: pdf
Language: English
Relation: Chemical Geology
Relation: Eales, H.V. and Marsh, J.S., 1983. Al/Cr ratios of coexisting pyroxenes and spinellids in some ultramafic rocks. Chemical Geology, 38(1-2), pp.57-74.
Relation: Chemical Geology volume 38 number 1-2 57 74 January 1983 0009-2541
Rights: Elsevier
Rights: Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)

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