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Zircon in mantle eclogite xenoliths: a review

Published online by Cambridge University Press:  21 January 2021

Aleksey E. Melnik Open the ORCID record for Aleksey E. Melnik [Opens in a new window] ,
Nester M. Korolev Open the ORCID record for Nester M. Korolev [Opens in a new window] ,
Sergey G. Skublov ,
Dirk Müller ,
Qiu-Li Li  and
Xian-Hua Li
Aleksey E. Melnik*
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng West Road 19, Beijing100029, China Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St Petersburg199034, Russia
Nester M. Korolev
Affiliation:
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St Petersburg199034, Russia Saint-Petersburg State University, nab. Universitetskaya 7–9, St Petersburg199034, Russia
Sergey G. Skublov
Affiliation:
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St Petersburg199034, Russia Saint-Petersburg Mining University, 21-ya Liniya 2, St Petersburg199106, Russia
Dirk Müller
Affiliation:
Department for Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany
Qiu-Li Li
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng West Road 19, Beijing100029, China
Xian-Hua Li
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng West Road 19, Beijing100029, China
*
Author for correspondence: Aleksey E. Melnik, Email: [email protected]
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Abstract

Very few zircon-bearing, kimberlite-hosted mantle eclogite xenoliths have been identified to date; however, the zircon they contain is crucial for our understanding of subcratonic lithospheric mantle evolution and eclogite genesis. In this study, we constrain the characteristics of zircon from mantle eclogite xenoliths based on existing mineralogical and geochemical data from zircons from different geological settings, and on the inferred origin of mantle eclogites. Given the likely origin and subsequent evolution of mantle eclogites, we infer that the xenoliths can contain zircons with magmatic, metamorphic and xenogenic (i.e. kimberlitic zircon) origins. Magmatic zircon can be inherited from low-pressure mafic oceanic crust precursors, or might form during direct crystallization of eclogites from primary mantle-derived melts at mantle pressures. Metamorphic zircon within mantle eclogites has a number of possible origins, ranging from low-pressure hydrothermal alteration of oceanic crustal protoliths to metasomatism related to kimberlite magmatism. This study outlines a possible approach for the identification of inherited magmatic zircon within subduction-related mantle eclogites as well as xenogenic kimberlitic zircon within all types of mantle eclogites. We demonstrate this approach using zircon grains from kimberlite-hosted eclogite xenoliths from the Kasai Craton, which reveals that most, if not all, of these zircons were most likely incorporated as a result of laboratory-based contamination.

Keywords

zirconmantle eclogitexenolithmantlekimberlite
Type
Review Article
Information
Geological Magazine , Volume 158 , Issue 8 , August 2021 , pp. 1371 - 1382
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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