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Trace-element distribution between coexisting aqueous fumarole condensates and natrocarbonatite lavas at Oldoinyo Lengai Volcano, Tanzania

Alexander J. Teague, Jacob Hanley, Terry M. Seward and Frederik Reutten
Trace-element distribution between coexisting aqueous fumarole condensates and natrocarbonatite lavas at Oldoinyo Lengai Volcano, Tanzania (in Volcanism and evolution of the African lithosphere, Luigi Beccaluva (editor), Gianluca Bianchini (editor) and Marjorie Wilson (editor))
Special Paper - Geological Society of America (June 2011) 478: 159-172

Abstract

Fieldwork was conducted in the active north crater of Oldoinyo Lengai volcano, Tanzania. Gases, aqueous fumarole condensates, and freshly erupted natrocarbonatite lavas were collected from several hornitoes associated with the same eruptive center and are considered to represent genetically related products of the same shallow magma chamber. Apparent trace-metal mineral-mineral partition coefficients were derived for the major carbonate phases, gregoryite and nyerereite, and several accessory phases within the fresh lava samples. Trace metals display an affinity for the accessory minerals. Textural information suggests that fluorite and coexisting sylvite are also present interstitially as quenched immiscible salt melts, and that any trace metals present may be scavenged from the carbonatite by the immiscible separation of these salt phases. Gas condensate analyses from the fumaroles associated with the eruption reveal further partitioning of trace elements into the vapor phase. Chalcophile elements show particularly high volatility, and this implies either gas release prior to sulfide formation or the decomposition of sulfides prior to eruption. The strong partitioning of metals into the halogenide and vapor phases has broad implications for the mobility of trace elements in the mantle source, the genesis of exotic mineralization associated with other carbonatites, and the ability of fumarole condensates to carry a direct chemical signature from their parent magma.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 478
Title: Trace-element distribution between coexisting aqueous fumarole condensates and natrocarbonatite lavas at Oldoinyo Lengai Volcano, Tanzania
Title: Volcanism and evolution of the African lithosphere
Author(s): Teague, Alexander J.Hanley, JacobSeward, Terry M.Reutten, Frederik
Author(s): Beccaluva, Luigieditor
Author(s): Bianchini, Gianlucaeditor
Author(s): Wilson, Marjorieeditor
Affiliation: University of Bristol, Department of Earth Sciences, Bristol, United Kingdom
Affiliation: Universita di Ferrara, Dipartimento di Scienze della Terra, Ferrara, Italy
Pages: 159-172
Published: 201106
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2478-2
References: 61
Accession Number: 2014-002971
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
S02°45'00" - S02°45'00", E35°55'60" - E35°55'60"
Secondary Affiliation: University of Leeds, GBR, United KingdomSaint Mary's University, CAN, CanadaEidgenoessische Technische Hochschule Zuerich, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201404
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