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, Faculty of Geology, Irkutsk, Russia
3A.P. Vinogradov Institute of Geochemistry SB RAS, Irkutsk, Russia
Rasskazov Sergei Vasilievich,
doctor of geological and mineralogical sciences, professor,
664003 Irkutsk, Lenin str., 3,
Irkutsk State University, Faculty of Geology,
Head of the Department of Dynamic Geology,
664033 Irkutsk, Lermontov str., 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, Lenin str., 3,
Irkutsk State University, Faculty of Geology,
Associate Professor of the Dynamic Geology chair,
664033 Irkutsk, Lermontov str., 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, Lermontov str., 128,
Institute of the Earth's Crust SB RAS,
Senior Researcher,
tel.: (3952) 51–16–59,
email: 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,
email: e_v_sar@mail.ru.
Bokareva Anastasiya Alexandovna,
664003 Irkutsk, Lenin str., 3,
Irkutsk State University, Faculty of Geology,
undergraduate student,
email: n.astiina@rambler.ru.
Abstract. The purpose of this study is to establish relationship between a source for final eruptions on the Dzotol volcano and those for the whole preceded Late Cenozoic volcanism in the Dariganga field. Major oxides, trace elements, and Pb isotopic ratios in rocks of the volcanic field are indicative for generation of magmatic melts in a homogeneous mantle region. In final eruptions of the Dzotol volcano, rocks show, on the one hand, intermediate geochemical signatures relative to those of other Dariganga volcanic rocks, and, on the other hand, lower Pb isotope ratios. We infer that Dariganga volcanic rocks were derived due to deep degassing of the about 4.47 Ga protomantle and were dispersed at the asthenospheric–lithospheric boundary affected by transtension. The source for the final Dzotol rocks corresponded in depth to the central part of the magma-generating region and displayed the Pb-isotopic protomantle component, previously designated in rare Quaternary Dariganga rocks.
Keywords: Asia, Mongolia, China, volcanism, Cenozoic, geodynamics, asthenosphere, lithosphere.
P. 91–131
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