Volcano–plutonic complex of the Tumrok Range (Eastern Kamchatka): an example of the Ural-Alaskan type intrusion and related volcanic series

Chayka, Ivan F., Baykov, Nikolay I., Kamenetsky, Vadim S., Kutyrev, Anton V. ORCID: https://orcid.org/0000-0001-5933-6455, Pushkarev, Evgenii V., Abersteiner, Adam and Shcherbakov, Vasily D. 2023. Volcano–plutonic complex of the Tumrok Range (Eastern Kamchatka): an example of the Ural-Alaskan type intrusion and related volcanic series. Minerals 13 (1) , 126. 10.3390/min13010126

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Abstract

Zoned plutons, composed of dunites, pyroxenites, and gabbroic rocks, have been referred to as the Ural-Alaskan type complexes (UA-complexes) and occur in numerous paleo-arc settings worldwide. Many of these complexes are source rocks for economic placers of platinum-group metals. Thus, it is important to understand how UA-complexes form and the origin and behavior of platinum-group elements (PGEs). It is widely assumed that the UA-complexes result from differentiation of supra-subduction high-Ca high-Mg sub-alkaline magmas. However, there is a lack of direct evidence for the existence and differentiation of such magmas, mainly because cases of UA-complexes being spatially and temporally linked to co-genetic volcanics are unknown. We studied an UA-complex from the Tumrok range (Eastern Kamchatka) where a dunite-clinopyroxenite-gabbro assemblage is spatially and temporary related to high-Ca volcanics (i.e., picrites and basalts). Based on the mineral and chemical composition of the rocks, mineral chemistry, and composition of melt inclusions hosted within rock-forming minerals, we conclude that the intrusive assemblage and the volcanics are co-genetic and share the same parental magma of ankaramitic composition. Furthermore, the compositions of the plutonic rocks are typical of UA-complexes worldwide. Finally, the rocks studied exhibit a full differentiation sequence from olivine-only liquidus in picrites and dunites to eutectic crystallization of diopside or hornblende, plagioclase, and K-Na feldspar in plagio-wehrlites and gabbroic rocks. All these results make the considered volcano–plutonic complex a promising case for petrological studies and modelling of UA-complex formation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	MDPI
ISSN:	2075-163X
Date of Acceptance:	12 January 2023
Last Modified:	05 Nov 2024 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/173075

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