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GEOREF RECORD

Chemical fingerprinting in detrital ilmenite; a viable alternative in provenance research?

Jeffry D. Grigsby
Chemical fingerprinting in detrital ilmenite; a viable alternative in provenance research?
Journal of Sedimentary Petrology (March 1992) 62 (2): 331-337

Abstract

Detrital ilmenite grains carry unique chemical fingerprints that can be used in provenance research. The elemental composition (Mn, Ti, V, Mg, Cr, Al; reported in weight percent oxide as determined by electron probe microanalysis) of homogeneous detrital ilmenite grains from felsic plutonic and volcanic, intermediate volcanic, and marie plutonic and volcanic parent rocks indicates that chemical signatures obtained in felsic and marie igneous parent rocks are retained by detrital ilmenite grains in daughter sands. Grains from marie igneous sources are enriched in TiO (sub 2) (50 + or - 1%) and have a more narrow range then grains from felsic igneous sources (48 + or - 2%). In addition, grains with MnO > 2.0% are most prevalent in sands from felsic rocks. Stepwise discriminant function analysis, using the oxides MnO, TiO (sub 2) , V (sub 2) O (sub 3) , MgO, Cr (sub 2) O (sub 3) , and Al (sub 2) O (sub 3) as the discriminating variables, found that grains from felsic and marie igneous rocks could be correctly classified 86% of the time. However, when grains from intermediate volcanic sources were added to the model, correct classification dropped to 62%. The complex chemical nature of detrital ilmenite grains from intermediate igneous sources indicates that there is much yet to learn about the composition of detrital ilmenite grains. However, if used in conjunction with other methods, chemical fingerprinting in detrital ilmenite may be a valuable addition to provenance research.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 62
Serial Issue: 2
Title: Chemical fingerprinting in detrital ilmenite; a viable alternative in provenance research?
Author(s): Grigsby, Jeffry D.
Affiliation: Univ. Tex., Bur. Econ. Geol., Austin, TX, United States
Pages: 331-337
Published: 199203
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 31
Accession Number: 1992-024282
Categories: Sedimentary petrologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
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