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A geochemical aid to igneous rock type identification in deeply weathered terrain

Authors
Journal
Journal of Geochemical Exploration
0375-6742
Publisher
Elsevier
Publication Date
Volume
20
Issue
1
Identifiers
DOI: 10.1016/0375-6742(84)90085-2

Abstract

Abstract A technique employing Ti, Zr and Cr to aid in the identification of primary igneous rock type in deeply weathered situations is described. The method is based on Ti/Zr ratio which is little affected either by primary alteration or weathering and adequately defines compositional fields for major igneous rock types. For volcanic rocks Ti/Zr ratios are rhyolite <4< dacite <12< andesite <60< basalt. Ultramafic rocks cannot be discriminated from mafic rocks by Ti/Zr ratio but are generally distinguished by high Cr.

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