A geochemical aid to igneous rock type identification in deeply weathered terrain |
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| Authors: | JA Hallberg |
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| Institution: | Division of Mineralogy, CSIRO, Private Bag P.O., Wembley, W.A. Australia |
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| 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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