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Mineralogical characteristics of sapphirine and application in investigating ultrahigh-temperature ( UHT) metamorphism
Jiao ShuJuan1; Guo JingHu1,2
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:1Pages:16-+
AbstractSapphirine is a specific high-temperature mineral in Mg-Al-rich granulites, and it is of significance in investigating ultrahigh-temperature (UHT) metamorphism. This study has tracked 47 sapphirine-bearing granulite localities among the worldwide 66 UHT granulite localities, and summarized the textural settings and metamorphic reaction sequences of several most commonly-observed sapphirine-bearing mineral assemblages, as well as the typical features of sapphirine mineral chemistry. Sapphirine compositions are usually localized close to the 7 : 9 : 3 end-member, and their X-Mg is usually higher than 0. 7, and XFe3+ shows a large range of 0 similar to 0. 7. Formation and evolution of the sapphirine-bearing mineral assemblages in the rocks indicate the experienced P-T paths. Textures of sapphirine replacing spinet, Grt/Opx + Sil replacing Spr + Qz assemblage, and subsequent Spr + Crd +/- Opx symplectite replacing Grt/Opx + Sil assemblage, generally indicate the cooling and subsequent decompression parts of an anticlockwise P-T path. Whereas, the texture of Grt/Opx + Sil/Ky or Mg-rich staurolite producing Spr + Qz assemblage, suggests that the rocks have probably experienced the heating and decompression stages in a clockwise P-T path. Different shapes of P-T paths imply that the origin mechanism of the UHT metamorphism is multiple, with the former probably resulting from underplating or accretion of the mantle-derived mafic magma, and the latter probably related to the long-lived hot orogenesis.
KeywordSapphirine UHT metamorphism Mineral assemblage Mineralogical feature Mg-Al-rich
DOI10.18654/1000-0569/2019.01.02
WOS KeywordEASTERN GHATS BELT ; GRANULITE-FACIES METAMORPHISM ; CALCULATED PHASE-EQUILIBRIA ; PLUS QUARTZ ASSEMBLAGE ; NORTH CHINA CRATON ; MG-AL GRANULITES ; ANAPOLIS-ITAUCU-COMPLEX ; LIMPOPO MOBILE BELT ; P-T EVOLUTION ; ORTHO-PYROXENE
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000456937400002
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90519
Collection岩石圈演化国家重点实验室
Corresponding AuthorJiao ShuJuan
Affiliation1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Jiao ShuJuan,Guo JingHu. Mineralogical characteristics of sapphirine and application in investigating ultrahigh-temperature ( UHT) metamorphism[J]. ACTA PETROLOGICA SINICA,2019,35(1):16-+.
APA Jiao ShuJuan,&Guo JingHu.(2019).Mineralogical characteristics of sapphirine and application in investigating ultrahigh-temperature ( UHT) metamorphism.ACTA PETROLOGICA SINICA,35(1),16-+.
MLA Jiao ShuJuan,et al."Mineralogical characteristics of sapphirine and application in investigating ultrahigh-temperature ( UHT) metamorphism".ACTA PETROLOGICA SINICA 35.1(2019):16-+.
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