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Ultramafic to mafic granulites from the Larsemann Hills, East Antarctica: Geochemistry and tectonic implications
Tong, LX (Tong, Laixi)1; Jahn, BM (Jahn, Bor-ming)2; Liu, XH (Liu, Xiaohan)3; Liang, XR (Liang, Xirong)1; Xu, YG (Xu, Yi-gang)1; Ionov, D (Ionov, Dmitri)1,4; Tong, LX
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
2017
Volume145Issue:SIPages:679-690
DOI10.1016/j.jseaes.2017.06.012
AbstractThe Larsemann Hills area is part of a reworked early Neoproterozoic metamorphic terrain in southwestern Prydz Bay, East Antarctica. Ultramafic and mafic granulites, whose origins remain controversial, occur as lenses, boudins or layered bodies within the para- and ortho-gneiss in the region. The ultramafic and mafic granulites show spinel-olivine-bearing and two-pyroxene-bearing mineral assemblages recrystallized at 860-900 degrees C. Their bulk rock analyses indicate an origin as igneous cumulates, with high Mg-# (molar MgO/(MgO + FeO)) from 0.73 to 0.84 for ultramafic granulite and from 0.46 to 0.78 for mostly mafic granulite as well as high Cr and Ni contents ([Cr] and [Ni] up to 1826 ppm and 1400 ppm respectively for ultramafic granulite and [Cr] of 1460 ppm for mafic granulite). Trace element patterns show pronounced negative Nb anomalies, suggesting a subduction-related tectonic setting for their precursors, consistent with derivation from arc basalts, also suggested by low TiO2 and K-enrichment in mafic granulites. The ultramafic to mafic granulites may have been formed in a subduction-related continental back-arc basin environment simultaneously with peak metamorphism associated with arc-continent collision during the early Neoproterozoic (990-900 Ma) Rayner orogeny.
Subject Area地质学
WOS IDWOS:000411533600026
Language英语
Indexed BySCI
KeywordPrince-charles Mountains Amery Ice Shelf Prydz Bay Area Facies Metamorphism Rauer Group Brattstrand Bluffs Crustal Evolution Continental-crust Vestfold Block 500 Ma
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary ; Geology
Cooperation Status国际
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7995
Collection图书馆
Corresponding AuthorTong, LX
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China.
2.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan.
3.Chinese Acad Sci, Inst Tibetan Plateau, Beijing 100085, Peoples R China.
4.Montpellier Univ, Geosci Montpellier, F-34095 Montpellier, France.
Recommended Citation
GB/T 7714
Tong, LX ,Jahn, BM ,Liu, XH ,et al. Ultramafic to mafic granulites from the Larsemann Hills, East Antarctica: Geochemistry and tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,145(SI):679-690.
APA Tong, LX .,Jahn, BM .,Liu, XH .,Liang, XR .,Xu, YG .,...&Tong, LX.(2017).Ultramafic to mafic granulites from the Larsemann Hills, East Antarctica: Geochemistry and tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,145(SI),679-690.
MLA Tong, LX ,et al."Ultramafic to mafic granulites from the Larsemann Hills, East Antarctica: Geochemistry and tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 145.SI(2017):679-690.
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