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Article

The Newly Discovered Neoproterozoic Aillikite Occurrence in Vinoren (Southern Norway): Age, Geodynamic Position and Mineralogical Evidence of Diamond-Bearing Mantle Source

1
Kola Science Centre, Geological Institute, Russian Academy of Science, 184209 Apatity, Russia
2
Norwegian Mining Museum, 3616 Kongsberg, Norway
3
Institute of Geosciences, University of Potsdam, 14476 Potsdam-Golm, Germany
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(11), 1029; https://doi.org/10.3390/min10111029
Received: 21 October 2020 / Revised: 11 November 2020 / Accepted: 16 November 2020 / Published: 18 November 2020
(This article belongs to the Special Issue Petrology and Ores of Igneous Alkaline Rocks and Carbonatites)
During the period 750–600 Ma ago, prior to the final break-up of the supercontinent Rodinia, the crust of both the North American Craton and Baltica was intruded by significant amounts of rift-related magmas originating from the mantle. In the Proterozoic crust of Southern Norway, the 580 Ma old Fen carbonatite-ultramafic complex is a representative of this type of rocks. In this paper, we report the occurrence of an ultramafic lamprophyre dyke which possibly is linked to the Fen complex, although 40Ar/39Ar data from phenocrystic phlogopite from the dyke gave an age of 686 ± 9 Ma. The lamprophyre dyke was recently discovered in one of the Kongsberg silver mines at Vinoren, Norway. Whole rock geochemistry, geochronological and mineralogical data from the ultramafic lamprophyre dyke are presented aiming to elucidate its origin and possible geodynamic setting. From the whole-rock composition of the Vinoren dyke, the rock could be recognized as transitional between carbonatite and kimberlite-II (orangeite). From its diagnostic mineralogy, the rock is classified as aillikite. The compositions and xenocrystic nature of several of the major and accessory minerals from the Vinoren aillikite are characteristic for diamondiferous rocks (kimberlites/lamproites/UML): Phlogopite with kinoshitalite-rich rims, chromite-spinel-ulvöspinel series, Mg- and Mn-rich ilmenites, rutile and lucasite-(Ce). We suggest that the aillikite melt formed during partial melting of a MARID (mica-amphibole-rutile-ilmenite-diopside)-like source under CO2 fluxing. The pre-rifting geodynamic setting of the Vinoren aillikite before the Rodinia supercontinent breakup suggests a relatively thick SCLM (Subcontinental Lithospheric Mantle) during this stage and might indicate a diamond-bearing source for the parental melt. This is in contrast to the about 100 Ma younger Fen complex, which were derived from a thin SCLM. View Full-Text
Keywords: aillikite; phlogopite; carbonate; spinel; ilmenite; titanite; diamond; Vinoren; Southern Norway aillikite; phlogopite; carbonate; spinel; ilmenite; titanite; diamond; Vinoren; Southern Norway
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MDPI and ACS Style

Zozulya, D.R.; Kullerud, K.; Ribacki, E.; Altenberger, U.; Sudo, M.; Savchenko, Y.E. The Newly Discovered Neoproterozoic Aillikite Occurrence in Vinoren (Southern Norway): Age, Geodynamic Position and Mineralogical Evidence of Diamond-Bearing Mantle Source. Minerals 2020, 10, 1029. https://doi.org/10.3390/min10111029

AMA Style

Zozulya DR, Kullerud K, Ribacki E, Altenberger U, Sudo M, Savchenko YE. The Newly Discovered Neoproterozoic Aillikite Occurrence in Vinoren (Southern Norway): Age, Geodynamic Position and Mineralogical Evidence of Diamond-Bearing Mantle Source. Minerals. 2020; 10(11):1029. https://doi.org/10.3390/min10111029

Chicago/Turabian Style

Zozulya, Dmitry R., Kåre Kullerud, Enrico Ribacki, Uwe Altenberger, Masafumi Sudo, and Yevgeny E. Savchenko 2020. "The Newly Discovered Neoproterozoic Aillikite Occurrence in Vinoren (Southern Norway): Age, Geodynamic Position and Mineralogical Evidence of Diamond-Bearing Mantle Source" Minerals 10, no. 11: 1029. https://doi.org/10.3390/min10111029

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