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Chevkinite-group minerals from the mantle-derived metaluminous Woshui Syenite of the Emeishan large igneous province

J. Gregory Shellnutt and Yoshiyuki Iizuka
Chevkinite-group minerals from the mantle-derived metaluminous Woshui Syenite of the Emeishan large igneous province
European Journal of Mineralogy (December 2013) 25 (4): 671-682

Abstract

The composition of chevkinite-group minerals from the Late Permian Woshui pluton is presented. The Woshui pluton is one of the few mantle-derived metaluminous syenitic intrusions within the Emeishan large igneous province of SW China and contains four times less Sigma REE (Sigma REE = 0.05 wt.%) than the spatially and temporally associated Baima peralkaline syenitic pluton (Sigma REE = 0.2 wt.%). The chevkinite-group minerals are relatively uniform in composition and observed chemical trends are consistent with substitution between major cationic sites defined as: Ca (super 2+) (sub A) +Ti (super 4+) (sub C) <--> REE (super 3+) (sub A) +M (super 3+,2+) (sub C) The chevkinite-group minerals from the Woshui syenites are unique in that they display positive chondrite-normalized Eu-anomalies (i.e. Eu/Eu* = 2.3 to 23) which may be related to the conditions that produced the parental magma. The magmatic conditions of Woshui pluton were likely to be low pressure (i.e. < or = 1 kbar), moderate temperature (i.e. 700-800 degrees C) and relatively oxidizing (fO (sub 2) > or = FMQ > 0). In comparison to chevkinite-group minerals reported from peralkaline rocks, those from metaluminous rocks tend to have higher SiO (sub 2) , Al (sub 2) O (sub 3) , CaO and ZrO and lower FeO*, Nb (sub 2) O (sub 5) and Ce (sub 2) O (sub 3) . The compositional differences are attributed to parental magma composition and possible magmatic origin (i.e. partial melting vs. crystal fractionation).


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 4
Title: Chevkinite-group minerals from the mantle-derived metaluminous Woshui Syenite of the Emeishan large igneous province
Affiliation: National Taiwan Normal University, Department of Earth Sciences, Taipai, Taiwan
Pages: 671-682
Published: 201312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 52
Accession Number: 2014-002428
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N27°01'00" - N27°04'60", E102°04'00" - E102°07'60"
Secondary Affiliation: Academia Sinica, TWN, Taiwan
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201403
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