Genesis of Dunite from the Guli puton According to Olivine-Hosted Melt Inclusion Data

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Abstract

Olivine from the dunite of the Guli pluton crystallized from olivine-melanephelinite magma at temperatures above 1260˚C according to the melt inclusion study. The melts were enriched with volatile components (S, CO2, F, H2O, slightly Cl) and contained high amount of incompatible elements. In addition, olivine hosts sporadic inclusions of picrite-basalt composition, which are close to picrite-meimechite melts preserved in chromite of dunite according to literature data. It suggests the influx of picrito-meimechite melts and the mixing of latter with melanephelinite magma were carried out during the formation of dunites in the magma chamber. Based on the indicator ratios of incompatible elements, these melts and melanephelinite magma had different sources, which were located near the undepleted mantle, at different depths and varying degrees of partial melting.

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About the authors

Liia I. Panina

Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences

Email: panina@igm.nsc.ru
Russian Federation, Novosibirsk

Aleksandra T. Isakova

Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences

Email: atnikolaeva@igm.nsc.ru
Russian Federation, Novosibirsk

Elena U. Rokosova

Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences

Author for correspondence.
Email: rokosovae@igm.nsc.ru
Russian Federation, Novosibirsk

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Supplementary files

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2. Fig. 1. Schematic geological map of the Gulinsky pluto by (Egorov, 1991): 1 – dunites, 2 – clinopyroxenites, 3 – alkaline rocks, 4 – carbonatites, 5 – meimechites, 6 – volcanogenic rocks, 7 – quaternary deposits, 8 – faults, 9 – the assumed boundary of the Gulinsky massif; black circle – the place of the main selection of the studied breeds, model 1059/1. The geographical position of Gulinsky Pluto is marked with a star on the inset.

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3. Fig. 2. Primary melt inclusions in olivine of dunites of Gulinsky Pluto: (a) – single primary melt inclusion and secondary inclusions along the crack; (b) – primary melt inclusion before heating, (c) – the same switching on after warming up, Thom = 1260 ° C. An image in passing light.

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4. Fig. 3. Multielement distribution spectra of incompatible elements in dunite and glass of primary melt inclusions in olivine, normalized to the primitive mantle (McDonough, Sun, 1995).

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5. Fig. 4. Binary diagram of the dependence of the main oxides on SiO2 (in wt. %) in tempered glasses of molten inclusions in olivine and chrome spinel of ultramafic rocks of the Gulinsky Pluto: 1 – in olivine of dunites, 2 – in olivine of melilite melanefelinites (Vasiliev et al., 2017), 3 – in chrome spinel of dunites (Simonov et al., 2016), 4 – in olivine of meimechites (Sobolev et al., 2009), 5 – in picrite olivine (Panina, Motorina, 2013), 6 – in kugdite olivine (Russ, Shoulder b, 2000).

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6. Rhys. 5. Multi-element distribution spectra incongruent extravehicular in steclach rasplavn included in the ultrabasic minerals is the rock of the Gulinsky Pluto, normalized to primitive mantles (Apostille, 1995): 1-in olivine dunitov, 2-in chromspinelide dunitov (Simonov, etc., 2016), 3 – in olivine meimechitov (Sobolev, etc., 2009), 4 – v clinopyroxene melanefelinite (Panina, Motorina, 2013), 5 – v olivine pikritov (Panina, Motorina, 2013).

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