gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2012-3-4-0081gtcrust-172Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSВЫСОКОМАГНЕЗИАЛЬНЫЕ ЛАВЫ ДАРИГАНСКОГО ВУЛКАНИЧЕСКОГО ПОЛЯ, ЮГО-ВОСТОЧНАЯ МОНГОЛИЯ: ПЕТРОГЕНЕТИЧЕСКАЯ МОДЕЛЬ МАГМАТИЗМА НА АСТЕНОСФЕРНО-ЛИТОСФЕРНОЙ ГРАНИЦЕHIGH-MG LAVAS FROM THE DARIGANGA VOLCANIC FIELD IN THE SOUTHEASTERN MONGOLIA: PETROGENETIC MODEL OF MAGMATISM AT THE ASTHENOSPHERE–LITHOSPHERE BOUNDARYЧувашоваИрина СергеевнаChuvashovaIrina S.

канд. геол.мин. наук, н.с., 664033, Иркутск, ул. Лермонтова, 128;

геологический факультет, старший преподаватель кафедры динамической геологии

Candidate of Geology and Mineralogy, Researcher,

128 Lermontov street, Irkutsk 664033

chuvashova@crust.irk.ruРассказовСергей ВасильевичRasskazovSergey V.

докт. геол.мин. наук, профессор, зав. лабораторией, 664033, Иркутск, ул. Лермонтова, 128;

геологический факультет, зав. кафедрой динамической геологии

Doctor of Geology and Mineralogy, Professor, Head of Laboratory,

128 Lermontov street, Irkutsk 664033

rassk@crust.irk.ruЯсныгинаТатьяна АлександровнаYasnyginaTatiana A.

канд. геол.мин. наук, с.н.с.,

664033, Иркутск, ул. Лермонтова, 128

Candidate of Geology and Mineralogy, Senior Researcher,

128 Lermontov street, Irkutsk 664033

ty@crust.irk.ruМихееваЕкатерина АндреевнаMikheevaEkaterina A.

старший лаборант, 664033, Иркутск, ул. Лермонтова, 128;

геологический факультет, магистрант

Senior Lab Assistant,

128 Lermontov street, Irkutsk 664033

Институт земной коры СО РАН; Иркутский государственный университетРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation20120210201534385407Copyright © Чувашова И.С., Рассказов С.В., Ясныгина Т.А., Михеева Е.А., 20152015Чувашова И.С., Рассказов С.В., Ясныгина Т.А., Михеева Е.А.Chuvashova I.S., Rasskazov S.V., Yasnygina T.A., Mikheeva E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/172

Установлен пространственный контроль высокомагнезиальных вулканических пород (MgO=11.0–15.8 мас. %) линейными зонами протяженностью более 90 км и резкие отличия их химического состава от умеренно-магнезиальных (MgO=3.0–11.0 мас. %) пород, занимающих всю изометричную территорию вулканического поля Дариганга. При сравнительном анализе петрогенных и малых элементов пород этого поля обоснована петрогенетическая модель мантийного магматизма одного глубинного уровня, в отличие от модели контрастных магматических процессов, проявленных на двух глубинных уровнях под вулканическим полем Ханнуоба. С учетом томографических данных о наличии Восточно-Монгольской низкоскоростной аномалии в верхней мантии, предполагается, что магматизм первого типа получил развитие в источниках на границе астеносферы–литосферы и непосредственно нижележащей астеносферы как отражение относительно слабого мантийного потока, вероятно, поднимавшегося с глубины ~250 км. Магматизм второго типа возник в обособленных источниках подлитосферной мантии и границы астеносферы–литосферы как свидетельство изначально сильного мантийного потока, возможно, зародившегося на глубине ~410 км.

It is revealed that high-Mg lavas (MgO=11.0–15.8 wt. %) are spatially controlled by linear zones extending for more than 90 km and demonstrate chemically distinct differences from moderately-Mg compositions (MgO=3.0–11.0 wt. %), which occupy the isometric area of the Dariganga volcanic field. From the major and trace-element data on the rocks in the field under study, we have justified a petrogenetic mode of the uniform one-level mantle magmatism. Our model differs from the contrasting magmatism model of the processes that developed at two levels beneath the Hannuoba volcanic field. Based on tomography images showing the East Mongolian local low-velocity anomaly in the upper mantle, we suggest that magmatism of Type 1 occurred in the mantle sources at the asthenosphere–lithosphere boundary and the underlying asthenosphere as a reflection of a relatively weak mantle flow that may have ascended from a depth of ~250 km. Magmatism of Type 2 occurred in the isolated sources of the sublithospheric mantle and the asthenosphere–lithosphere boundary as an evidence on the initially strong mantle flow that may have ascended from a depth of ~410 km.

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