Sr, Nd, Pb and trace element systematics of the New Caledonia harzburgites: Tracking source depletion and contamination processes in a SSZ setting

The New Caledonia ophiolite (Peridotite Nappe) consists primarily of harzburgites, locally overlain by mafic-ultramafic cumulates, and minor spinel and plagioclase lherzolites. In this study, a comprehensive geochemical data set (major and trace element, Sr-Nd-Pb isotopes) has been obtained on a new...

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Published in:地学前缘（英文版） 2020, Vol.11 (1), p.37-55
Main Authors: Arianna Secchiari, Alessandra Montanini, Delphine Bosch, Patrizia Macera, Dominique Cluzel
Format: Article
Language:English
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Summary:The New Caledonia ophiolite (Peridotite Nappe) consists primarily of harzburgites, locally overlain by mafic-ultramafic cumulates, and minor spinel and plagioclase lherzolites. In this study, a comprehensive geochemical data set (major and trace element, Sr-Nd-Pb isotopes) has been obtained on a new set of fresh harzburgites in order to track the processes recorded by this mantle section and its evolution.The studied harzburgites are low-strain tectonites showing porphyroclastic textures, locally grading into protomylonitic textures. They exhibit a refractory nature, as attested by the notable absence of primary clinopyroxene, very high Fo content of olivine (91-93 mol.％), high Mg# of orthopyroxene (0.91-0.93) and high Cr# of spinel (0.44-0.71). The harzburgites are characterised by remarkably low REE concentrations (
ISSN:1674-9871
DOI:10.1016/j.gsf.2019.12.004