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<datestamp>2018-01-11</datestamp>
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<title lang=en>Ultramafic to mafic granulites from the Larsemann Hills, East Antarctica: Geochemistry and tectonic implications</title>
<creator>Tong, Laixi</creator>
<creator>Jahn, Bor-Ming</creator>
<creator>Liu, Xiaohan</creator>
<creator>Liang, Xirong</creator>
<creator>Xu, Yi-gang</creator>
<creator>IONOV, Dmitri</creator>
<contributor>Guangzhou Institute of Geochemistry</contributor>
<contributor>National Taiwan University</contributor>
<contributor>Institute of Tibetan Plateau, Beijing</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0743-9547</source>
<source>Journal of Southeast Asian earth sciences</source>
<publisher>Elsevier</publisher>
<identifier>hal-01622589</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01622589</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01622589</source>
<source>Journal of Southeast Asian earth sciences, Elsevier, 2017, 145, pp.679-690. 〈10.1016/j.jseaes.2017.06.012〉</source>
<identifier>DOI : 10.1016/j.jseaes.2017.06.012</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jseaes.2017.06.012</relation>
<language>en</language>
<subject lang=en>Ultramafic to mafic granulites</subject>
<subject lang=en>Geochemistry</subject>
<subject lang=en>Rayner orogeny</subject>
<subject lang=en>Larsemann Hills</subject>
<subject lang=en>East Antarctica</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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 °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.</description>
<date>2017-09-01</date>
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