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Pargasite and ilmenite exsolution texture in clinopyroxenes from the Hujialing garnet-pyroxenite, Su-Lu UHP terrane, central China; a geodynamic implication

Chen Jing and Xu Zhi-qin
Pargasite and ilmenite exsolution texture in clinopyroxenes from the Hujialing garnet-pyroxenite, Su-Lu UHP terrane, central China; a geodynamic implication (in Micro- and mesoporous mineral phases, S. Merlino (editor))
European Journal of Mineralogy (December 2005) 17 (6): 895-903

Abstract

Amphibole exsolution textures are reported from the Hujialing garnet pyroxenite in the Su-Lu ultrahigh pressure (UHP) metamorphic terrain. The garnet pyroxenite, together with coesite-bearing eclogites, was exhumed from mantle depths. The garnet pyroxenite consists mainly of garnet and diopside, with minor pargasitic amphibole, ilmenite, Mg-Al spinel, magnetite, tremolite, orthopyroxene and olivine. Diopside contains abundant inclusions of garnet as well as pargasite and ilmenite lamellae. The present assemblage indicates that the parent mineral of the reported exsolution texture should have the composition of a mixture of pargasite, ilmenite and diopside. The primary clinopyroxene in the Hujialing garnet pyroxenite contains approximately 2000 ppm H (sub 2) O, suggesting a peak metamorphic pressure probably at 8.0 GPa. A two-stage exsolution process is suggested, implying a complex exhumation history for this garnet pyroxenite. Textural relationships imply that the exhumation of these UHP metamorphic rocks was accomplished in two stages, one at a depth of approximately 100 km, the other at much shallower depth.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 17
Serial Issue: 6
Title: Pargasite and ilmenite exsolution texture in clinopyroxenes from the Hujialing garnet-pyroxenite, Su-Lu UHP terrane, central China; a geodynamic implication
Title: Micro- and mesoporous mineral phases
Author(s): Chen JingXu Zhi-qin
Author(s): Merlino, S.editor
Affiliation: Peking University, School of Physics, Beijing, China
Pages: 895-903
Published: 200512
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Micro- and mesoporous mineral phases
Meeting location: Rome, ITA, Italy
Meeting date: 20041206Dec. 6-7, 2004
References: 38
Accession Number: 2006-015613
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Chinese Academy of Geosciences, CHN, China
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200608
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