Trace element characteristics in the diopsides of peridotite xenoliths: a laser ablation-inductively coupled plasma-mass spectrometry study |
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| Authors: | Shaohai Chen Xinghua Zhou S Y O’Reilly W L Griffin Guohui Zhang M Zhang |
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| Institution: | (1) Laboratory of Lithosphere Tectonic Evolution, Institute of Geology, Chinese Academy of Sciencen, 100029 Beijing, China;(2) GEMOC, School of Earth Sciences, Macquarie University, 2109 Sydney, Australia |
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| Abstract: | Among the various xenoliths entrained by the Cenozoic Hannuoba basalts, peridotite is the most abundant one. The trace elements
of the diopsides from the peridotite xenoliths were analysed by LA-ICP-MS. The overall depletion and some heterogeneity of
the continental mantle beneath northern North China Craton were indicated by the characteristics of the trace elements. The
ΣREE amount in diopside correlates with the Cr/(Cr + Al) ratio of diopside which is indicative of xenolith’s partial melting
degree. An the peridotite hosts and pyroxenite veins show similar REE distribution patterns, the composite xenoliths are probably
formed by mantle deformation, rather than by the late metasomatism of mantle fluids/melts. |
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| Keywords: | LA-ICP-MS diopside trace elements |
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