Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences

Perepelov, A. B.; Kuzmin, M. I.; Tsypukova, S. S.; Demonterova, Е. I.; Ivanov, Alexei V.; Shcherbakov, Yu. D.; Puzankov, M. Yu.; Oдгэрэл, Д.; Dash, B.

doi:10.1134/s1028334x1710018x

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Снижение значений FeO/Mn от трахиандезибазальтов инициальной стадии к трахибазальтам заключительной стадии, а также установленные закономерности вариаций редкоэлементного и изотопного состава Sr, Nd и Pb для этих групп пород могут свидетельствовать о смене источников вещества в направлении от существенно метасоматизированной мантии с присутствием Grt-содержащего пироксенитового или эклогитового компонента к слабо метасоматизированной перидотитовой мантии MORB типа. Возможность участия эклогитового компонента в формировании кайнозойских щелочно-базальтовых магм Северной Монголии отмечалась ранее в работах [Perepelov et al, 2017[Perepelov et al, , 2020.…”

Section: Discussionunclassified

Two Stages of the Cenozoic Alkaline-Basalt Volcanism in the Darkhad Depression (Northern Mongolia) – Geochronology, Geochemistry, and Geodynamic Consequences

Tsypukova

Perepelov

Demonterova

et al. 2022

Geodin. tektonofiz.

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The isotopic data showed that there are two stages distinguished in the Cenozoic history of the Darkhad depression volcanic activity, the Late Oligocene initial stage (~28.0–26.6 Ma) and the final Late Miocene – Early Pliocene stage (~5.8–4.2 Ma). It has been stated that the rocks of the initial stage are only represented by trachybasalts; however, among the final-stage basaltoids there are series of shield-volcano hawaite-basanite-phonotephrite rocks and compex trachybasaltic "valley" lava flows, the formation of which is the last stage in the territorial volcanic evolution. It has been shown that the initial-stage trachybasaltic andesites are characterized by their enrichment of TiO2, P2O5, Sr, Zn, Ga and low concentrations of Al2O3, MnO, CaO, Sc and HREE (La/Yb=27.2–30.2). Basaltoids of the final stage have a similar rare-element distribution and show an increase in the contents of TiO2, Al2O3, P2O5, LILE, HFSE, Th, U and in the degree of fractionation of REE (La/Yb from 12.2 to 20.9) towards the rocks alkalinity enhancement. Modeling of eclogite, pyroxenite and peridotite melting processes in the La/Yb – Sm/Yb system shows that trachybasaltic andesite melts could be formed at ~7–8 % melting of eclogitic matter or at ~10–11 % melting of Grt-containing pyroxenites, with trachybasalt formed at ~3 % melting of Grt-containing peridotites. The composition distribution of rocks in coordinates (Mg# – Fe/Mn) indicates that the parental magmas are the initial-stage trachybasaltic andesite magmas as well as the Early Pliocene trachybasaltic "valley" lava flows. Sr, Nd, Pb isotope characteristics of the Darkhad depression basaltoids show significant shift of isotopic ratios in time towards the relatively enriched mantle as compared with the depleted MORB mantle. The initial formation of trachybasaltic andesite melts occurred in the Late Oligicene at the pre-rift stage of the territory development involving metasomatized mantle matter, with the pyroxenite or eclogite component contained in the magma formation source. The origin of trachybasalt magmas of the final stage is associated with the processes of decompression melting of peridotites in a weakly metasomatized lithospheric mantle at the rift stage of the Darkhad structure development.

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Section: Discussionunclassified

Two Stages of the Cenozoic Alkaline-Basalt Volcanism in the Darkhad Depression (Northern Mongolia) – Geochronology, Geochemistry, and Geodynamic Consequences

Tsypukova

Perepelov

Demonterova

et al. 2022

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“…Yarmolyuk et al [2015] involves a lower mantle plume for PREMA, EM I and EM II components irrespective of their origin. Perepelov et al [2017] accept the lower mantle plume, though specify the EM I component as being derived from recycled oceanic lithosphere in form of eclogite. There is more agreement on the melting depth -the melting occurs at the garnet stability field in the range of ~60-80 km depth.…”

Section: P a L E O G E O D Y N A M I C Smentioning

confidence: 99%

Late Cenozoic Volcanism of the Uda River Area (Eastern Sayan, Siberia): The First Geochemical and Isotopic Data

Demonterova

Ivanov

Perepelov

2017

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Section: Introductionmentioning

confidence: 99%

“…Multiple events of magmatic activity have produced geographically dispersed volcanic fields (Figure 1a), sometimes of controversial origin. Volcanism in the region has received ample literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The available publications discuss Late Cenozoic volcanism in terms of ages, mineralogy, majorand trace-element chemistry, and isotope systematics used to reconstruct the sources of magma and causes of Late Cenozoic volcanic activity in Central Asia.…”

Section: Introductionmentioning

confidence: 99%

Late Cenozoic Uguumur and Bod-Uul Volcanic Centers in Northern Mongolia: Mineralogy, Geochemistry, and Magma Sources

et al. 2020

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The paper presents new data on mineralogy, geochemistry, and Sr-Nd-Pb isotope systematics of Late Cenozoic eruption products of Uguumur and Bod-Uul volcanoes in the Tesiingol field of Northern Mongolia, with implications for the magma generation conditions, magma sources, and geodynamic causes of volcanism. The lavas and pyroclastics of the two volcanic centers are composed of basanite, phonotephrite, basaltic trachyandesite, and trachyandesite, which enclose spinel and garnet peridotite and garnet-bearing pyroxenite xenoliths; megacrysts of Na-sanidine, Ca-Na pyroxene, ilmenite, and almandine-grossular-pyrope garnets; and carbonate phases. The rocks are enriched in LILE and HFSE, show strongly fractioned REE spectra, and are relatively depleted in U and Th. The low contents of U and Th in Late Cenozoic volcanics from Northern and Central Mongolia represent the composition of a magma source. The presence of carbonate phases in subliquidus minerals and mantle rocks indicates that carbon-bearing fluids were important agents in metasomatism of subcontinental lithospheric mantle. The silicate-carbonate melts were apparently released from eclogitizied slabs during the Paleo-Asian and Mongol-Okhotsk subduction. The parent alkali-basaltic magma may be derived as a result from partial melting of Grt-bearing pyroxenite or eclogite-like material or carobantized peridotite. The sources of alkali-basaltic magmas from the Northern and Central Mongolia plot different isotope trends corresponding to two different provinces. The isotope signatures of megacrysts are similar to those of studied volcanic centers rocks. The P-T conditions inferred for the crystallization of pyroxene and garnet megacrysts correspond to a depth range from the Grt-Sp phase transition to the lower crust. Late Cenozoic volcanism in Northern and Central Mongolia may be a response to stress propagation and gravity instability in the mantle associated with the India-Asia collision.

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Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences

Cited by 5 publications

References 13 publications

Two Stages of the Cenozoic Alkaline-Basalt Volcanism in the Darkhad Depression (Northern Mongolia) – Geochronology, Geochemistry, and Geodynamic Consequences

Two Stages of the Cenozoic Alkaline-Basalt Volcanism in the Darkhad Depression (Northern Mongolia) – Geochronology, Geochemistry, and Geodynamic Consequences

Late Cenozoic Volcanism of the Uda River Area (Eastern Sayan, Siberia): The First Geochemical and Isotopic Data

Late Cenozoic Uguumur and Bod-Uul Volcanic Centers in Northern Mongolia: Mineralogy, Geochemistry, and Magma Sources

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