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UDC 552.3:551.14 + 550.93 (51)
https://doi.org/10.26516/2541-9641.2022.3.30

Compositional Variability of Deep Spinel Peridotite Xenoliths from Late Cenozoic Basalts from the Shiliin-Bogd and Achagiin-Dush Volcanoes of Southeastern Mongolia: Reconstruction of Processes in the Continental Lithospheric Mantle



Authors


S.V. Rasskazov1,2, I.S. Chuvashova1,2, T.A. Yasnygina1, E.V. Saranina1,3, A.A. Bokareva2


1Institute of the Earth's Crust SB RAS, Irkutsk, Russia

2Irkutsk State University, Irkutsk, Russia

3Institute of Geochemistry, Russian Academy of Sciences, A.P. Vinogradov SB RAS, Irkutsk, Russia



About the Authors



Rasskazov Sergei Vasilievich,

doctor of geological and mineralogical sciences, professor,

664003 Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

Head of the Department of Dynamic Geology,

664033 Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Head of the Laboratory of Isotopy and Geochronology,

tel.: (3952) 51–16–59,

email: rassk@crust.irk.ru.


Chuvashova Irina Sergeevna,

candidate of geological and mineralogical sciences,

664003 Irkutsk, st. Lenina, d. 3,

Irkutsk State University, Faculty of Geology,

assistant professor,

664033 Irkutsk, st. Lermontova, d. 128,

Institute of the Earth's Crust SB RAS,

Senior Researcher,

tel.: (3952) 51–16–59,

email: chuvashova@crust.irk.ru.


Yasnygina Tatyana Alexandrovna,

candidate of geological and mineralogical sciences,

664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS,

Senior Researcher,

tel.: (3952) 51–16–59,

еmail: ty@crust.irk.ru.

Saranina Elena Vladimirovna,

candidate of geological and mineralogical sciences,

664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS,

Lead Engineer,

664033 Irkutsk, st. Favorskogo, 1 "A", A.P. Vinogradov Institute of Geochemistry SB RAS,

еmail: e_v_sar@mail.ru.

Bokareva Anastasiya Alexandrovna,

664003 Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

undergraduate student,

еmail: n.astiina@rambler.ru.


Abstract. From major oxides and trace elements in deep-seated xenoliths of garnet-free peridotites from a basalt pedestal and cinder-basalt edifice of the Shiliin-Bogd volcano, rocks are subdivided into groups according to the degree of depletion–enrichment and the effect of garnet on their compositions. Processes of depletion of peridotites with the restite formation, metasomatism with enrichment of rocks in light rare earth elements (REE), and mixing of various components of peridotites with the fluid one of protomantle are established. Limited compositions of peridotite xenoliths from the volcanic edifice associated with anorthoclase and clinopyroxene megacrysts is determined. The data obtained are compared with those on deep-seated peridotite xenoliths from cinder of the Achagiin-Dush volcano located 6 km from the Shiliin-Bogd one. It is inferred that compositions of deep-seated rocks under the volcanoes show different variability. A sequence of generation of the continental lithospheric mantle is reconstructed.


Keywords: volcanic rocks, deep-seated xenoliths, Cenozoic, Dariganga.


P. 30–63



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For citation


Rasskazov S.V. Compositional Variability of Deep Spinel Peridotite Xenoliths from Late Cenozoic Basalts from the Shiliin-Bogd and Achagiin-Dush Volcanoes of Southeastern Mongolia: Reconstruction of Processes in the Continental Lithospheric Mantle [Electronic resource] / S.V. Rasskazov, I.S. Chuvashova, T.A. Yasnygina, E.V. Saranina, A.A. Bokareva // Geology and Environment.— 2022.— V. 2, No. 3.— P. 30–63.DOI 10.26516/2541-9641.2022.3.30




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