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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2022-13-4-0650</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1545</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ПАЛЕОГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PALEOGEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>УСЛОВИЯ ФОРМИРОВАНИЯ СИЛЛОВ ГАББРО-ПЕРИДОТИТОВ ДОВЫРЕНСКОГО ИНТРУЗИВНОГО КОМПЛЕКСА (СЕВЕРНОЕ ПРИБАЙКАЛЬЕ)</article-title><trans-title-group xml:lang="en"><trans-title>CONDITIONS OF FORMATION OF GABBRO-PERIDOTITES SILLS OF THE DOVYRENSKY INTRUSIVE COMPLEX (NORTHERN BAIKAL REGION)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Орсоев</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Orsoev</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия</p></bio><bio xml:lang="en"><p>6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мехоношин</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Mekhonoshin</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Фаворского, 1а</p><p>664074, Иркутск, ул. Лермонтова, 83</p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033</p><p>83 Lermontov St, Irkutsk 664074</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Геологический институт им. Н.Л. Добрецова СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт геохимии им. А.П. Виноградова СО РАН; Иркутский национальный исследовательский технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Irkutsk National Research Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>12</day><month>10</month><year>2022</year></pub-date><volume>13</volume><issue>4</issue><fpage>650</fpage><lpage>650</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Орсоев Д.А., Мехоношин А.С., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Орсоев Д.А., Мехоношин А.С.</copyright-holder><copyright-holder xml:lang="en">Orsoev D.A., Mekhonoshin A.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/1545">https://www.gt-crust.ru/jour/article/view/1545</self-uri><abstract><p>Минералого-геохимическое изучение габбро-перидотитовых силлов, расположенных в приподошвенной части Йоко-Довыренского расслоенного массива среди вмещающих терригенно-карбонатных пород, показало, что наиболее мощные (200–250 м) из них дифференцированы от плагиолерцолитов до оливиновых габбро-норитов и их формирование хорошо описывается фракционной кристаллизацией пикробазальтового расплава. При поступлении в камеру кристаллизации он уже содержал некоторое количество интрателлурических кристаллов высокомагнезиального оливина (до 93 % Fo). Кристаллизация пород происходила в интервале температур 1234–985 °С при давлении 1.3–1.6 кбар, отвечающем глубине ~5–6 км. Рассчитанная глубина отделения исходного расплава от мантийного источника составила ~88 км, что отвечает литостатическому давлению ~28 кбар. По геохимическим параметрам состав исходного расплава характеризуется двойственной природой: он близок как базальтам надсубдукционного магматизма, так и базальтам коллизионных вулканоплутонических ареалов. Можно предположить, что формирование Сыннырского рифта с довыренским интрузивным комплексом связано с деструктивными процессами развития рассеянных спрединговых зон на коллизионно-аккреционном этапе развития Байкало-Муйского пояса на рубеже 720–800 млн лет.</p></abstract><trans-abstract xml:lang="en"><p>Mineralogical and geochemical study of the gabbro-peridotite sills located in the near-bottom part of the Yoko-Dovyren stratified massif among the host terrigenous-carbonate rocks showed that the thickest (200–250 m) of them are differentiated from plagiolherzolites to olivine gabbronorites. Their formation is well described by fractional crystallization of the picrobasalt melt. When it entered the crystallization chamber, it had already contained some intratelluric crystals of high-magnesian olivine (up to 93 % Fo). The rock crystallization occurred in the temperature range 1234–985 °C at pressure 1.3–1.6 kb, corresponding to depth ~5–6 km. The calculated depth of separation of the initial melt from the mantle source was ~88 km, which corresponds to the lithostatic pressure ~28 kbar. In terms of geochemical parameters, the composition of the initial melt is characterized by dual nature: they are close to both the basalts of suprasubduction magmatism and the basalts of collisional volcanic-plutonic areas. We assume that formation of the Synnyr rift with the Dovyren intrusive complex is due to the destructive development of scattered spreading zones at the collisional-accretionary stage of the Baikal-Muya belt within 720–800 Ma.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>габбро-перидотитовые силлы</kwd><kwd>Йоко-Довыренская интрузия</kwd><kwd>дифференциация</kwd><kwd>пикробазальты</kwd><kwd>довыренский комплекс</kwd><kwd>Сыннырский рифт</kwd></kwd-group><kwd-group xml:lang="en"><kwd>gabbro-peridotite sills</kwd><kwd>Yoko-Dovyren intrusion</kwd><kwd>differentiation</kwd><kwd>picrobasalts</kwd><kwd>Dovyrensky complex</kwd><kwd>Synnyrsky rift</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках базового проекта АААА-А21-121011890029-4 и при частичной поддержке РНФ, проект 22-27-00419.</funding-statement><funding-statement xml:lang="en">This work was carried out as part of the basic project AAAA-A21-121011890029-4 and was partially supported by the Russian Science Foundation project 22-27-00419.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ariskin A.A., Danyushevsky L.V., Konnikov E.G., Maas R., Kostitsyn Y.A., McNeill A., Merfe S., Nikolaev G.S., Kislov E.V., 2015. 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