| 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 Publication | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 2017 | |
| Volume | 145Issue:SIPages:679-690 |
| DOI | 10.1016/j.jseaes.2017.06.012 |
| Abstract | The 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 ID | WOS:000411533600026 |
| Language | 英语 |
| Indexed By | SCI |
| Keyword | Prince-charles Mountains Amery Ice Shelf Prydz Bay Area Facies Metamorphism Rauer Group Brattstrand Bluffs Crustal Evolution Continental-crust Vestfold Block 500 Ma |
| WOS Research Area | Geology |
| WOS Subject | Geosciences, Multidisciplinary ; Geology |
| Cooperation Status | 国际 |
| Subtype | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itpcas.ac.cn/handle/131C11/7995 |
| Collection | 图书馆 |
| Corresponding Author | Tong, LX |
| Affiliation | 1.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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| File Name/Size | DocType | Version | Access | License | ||
| V.145 679-690 2017.p（2002KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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