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Alkali/alumina molar ratio trends in altered granitoid rocks hosting porphyry and related deposits

J. F. Davies and R. E. Whitehead
Alkali/alumina molar ratio trends in altered granitoid rocks hosting porphyry and related deposits
Exploration and Mining Geology (January 2010) 19 (1-2): 13-22

Abstract

Alkali/alumina and MgO/alumina molar ratio plots graphically portray both chemical and mineralogical changes accompanying potassic, phyllic, argillic, chloritic, and alunitic alteration of quartz monzonites and granodiorites hosting porphyry (as well as lode and greisen) ore deposits. The molar ratio plots can be used to identify different types of alteration. In most cases, the identification based on molar ratios coincides with petrographic data. In those instances where the molar ratio and petrographic identifications do not agree, the mineralogy might need to be re-examined. Hydrothermal alteration studies using trace elements could benefit from the application of complementary alkali/alumina molar ratio plots.


ISSN: 0964-1823
Serial Title: Exploration and Mining Geology
Serial Volume: 19
Serial Issue: 1-2
Title: Alkali/alumina molar ratio trends in altered granitoid rocks hosting porphyry and related deposits
Affiliation: Laurentian University, Department of Earth Sciences, Sudbury, ON, Canada
Pages: 13-22
Published: 201001
Text Language: English
Summary Language: French
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum, Montreal, QC, Canada
References: 25
Accession Number: 2010-095261
Categories: Economic geology, geology of ore depositsGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
N42°30'00" - N51°00'00", W05°00'00" - E08°30'00"
S18°15'00" - N00°00'00", W81°10'00" - W69°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Geological Society of CIM. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201050
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