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Experimental data for a proposed empirical igneous geobarometer; aluminum in hornblende at 10 kbar pressure

Michael J. Rutter, Sieger R. Van der Laan and Peter J. Wyllie
Experimental data for a proposed empirical igneous geobarometer; aluminum in hornblende at 10 kbar pressure
Geology (Boulder) (October 1989) 17 (10): 897-900

Abstract

Knowledge of the depth of solidification of talc-alkalic plutons is critical to understanding and unraveling the complex spatial, temporal, and chemical evolution of orogenic belts. An empirical geobarometer has recently been proposed based on the total Al content (Al (sub T) ) of near-solidus calcic hornblendes in tonalite and granodiorite intrusive rocks in the pressure range < 1 to 8 kbar. Pressures were estimated from mineral assemblages in associated metamorphic country rocks. We report experimental data on newly crystallized near-solidus amphiboles in partly melted, vapor-absent garnet tonalite at 10 kbar that provide some experimental support for the proposed geobarometer consistent with the extrapolated empirical result, and confirm its limited applicability to specific, multimineral assemblages.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 17
Serial Issue: 10
Title: Experimental data for a proposed empirical igneous geobarometer; aluminum in hornblende at 10 kbar pressure
Affiliation: R. Arsenal East, DQA/TS, London, United Kingdom
Pages: 897-900
Published: 198910
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 13
Accession Number: 1989-069791
Categories: Igneous and metamorphic petrologyMineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Calif. Inst. Technol., Div. Geol. and Planet. Sci., Contrib. No. 4595
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Calif. Inst. Technol., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
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