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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Litologiâ i poleznye iskopaemye</journal-id><journal-title-group><journal-title xml:lang="en">Litologiâ i poleznye iskopaemye</journal-title><trans-title-group xml:lang="ru"><trans-title>Литология и полезные ископаемые</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0024-497X</issn><issn publication-format="electronic">3034-5375</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">11514</article-id><article-id pub-id-type="doi">10.31857/S0024-497X20192102-118</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Terrigenous sedimentation on the submarine Shirshov Ridge (Bering Sea) during the last deglaciation</article-title><trans-title-group xml:lang="ru"><trans-title>Терригенное осадконакопление на подводном хребте Ширшова (Берингово море) во время последней дегляциации</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Murdmaa</surname><given-names>I. O.</given-names></name><name xml:lang="ru"><surname>Мурдмаа</surname><given-names>И. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>murdmaa@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dorokhova</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Дорохова</surname><given-names>Е. B.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>zhdorokhova@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ovsepyan</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Овсепян</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eovsepyan@ocean.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dara</surname><given-names>O. M.</given-names></name><name xml:lang="ru"><surname>Дара</surname><given-names>О. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eovsepyan@ocean.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nürnberg</surname><given-names>D.</given-names></name><name xml:lang="ru"><surname>Нюрнберг</surname><given-names>Д.</given-names></name></name-alternatives><address><country country="DE">Germany</country></address><email>eovsepyan@ocean.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Shirshov Institute of Oceanology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт океанологии им. П. П. Ширшова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">GEOMAR, Helmholtz Center for Ocean Research Kiel</institution></aff><aff><institution xml:lang="ru">ГЕОМАР, Гельмгольц центр по исследованию океана г. Киль</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-03-28" publication-format="electronic"><day>28</day><month>03</month><year>2019</year></pub-date><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>102</fpage><lpage>118</lpage><history><date date-type="received" iso-8601-date="2019-03-27"><day>27</day><month>03</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-03-27"><day>27</day><month>03</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/0024-497X/article/view/11514">https://journals.eco-vector.com/0024-497X/article/view/11514</self-uri><abstract xml:lang="en"><p>The submarine Shirshov Ridge is an independent system of terrigenous sedimentation, which is geomorphologically isolated from bottom terrigenous influx into the deep-water basin of the Bering Sea. Using the ridge as example, we studied background hemipelagic sedimentation of the finely dispersed terrigenous suspended material from water column and deposition of the coarser grained ice-rafted material in the western part of the deep-water basin. The grain-size and mineral composition of postglacial sediments of the Shirshov Ridge was studied in cores SO201-2-85KL and SO201-2-77KL taken from local basins in the central and southern parts of the ridge, respectively. Statistic treatment of uninterrupted grain-size distributions (GD) of terrigenous component of the postglacial sediments by end-member (EM) modelling revealed that the grain-size distributions of terrigenous sediments from two cores are determined by the mixing of three EMs. EM-1 and EM-2 reflect the hemipelagic sedimentation with and without bottom currents influence respectively, while EM-3 with mode at fine-grained sand characterizes GD of the ice-rafted material. Reconstructed mechanisms of terrigenous influx on the Shirshov Ridge involve advection of the suspended matter with surface and intermediate water masses and ice-rafting. The relative role of both mechanisms of the terrigenous sedimentation under the influence of varying bottom current velocities for intervals of Last Glacial Maximum, early deglaciation, Heinrich event 1, Bølling–Allerød, Younger Dryas, and Early Holocene is estimated. It is ascertained that the grain-size distribution of terrigenous component is defined by climate variations, sea ice coverage, sea ice drift pathways, conditions of fast ice melting, and mobility of bottom waters. High concentrations of drifting ice or seasonal sea ice cover likely existed above the southern part of the ridge during the second half of the Heinrich 1 event. The low mobility of bottom waters facilitated only the subice hemipelagic sedimentation of fine fractions from the background reserve of suspended material. A sharp reduction of ice-rafted flux was reconstructed for the Bølling–Allerød warming interval. Bottom currents affected sedimentation in the central part of the ridge during the entire deglaciation (in addition to the second half of the Heinrich 1 event), and in the southern part during the Bølling–Allerød, Younger Dryas, and Early Holocene.</p></abstract><trans-abstract xml:lang="ru"><p>Подводный хребет Ширшова представляет собой самостоятельную систему терригенной седиментации, геоморфологически изолированную от придонных потоков поступления терригенного материала в глубоководную котловину Берингова моря. Это позволило на его примере исследовать фоновую гемипелагическую седиментацию тонкодисперсной терригенной взвеси из водной толщи и осаждение более крупнозернистого материала ледового разноса в западной части глубоководной котловины. Гранулометрический и минеральный состав послеледниковых отложений хребта Ширшова изучен в колонках SO201-2-85KL и SO201-2-77KL, отобранных в локальных впадинах центральной и южной частей хребта, соответственно. Статистическая обработка непрерывных гранулометрических распределений (ГР) терригенной составляющей послеледниковых отложений методом моделирования конечных элементов (КЭ) выявила смешивание трех КЭ в реальном гранулометрическом составе осадков из двух колонок. КЭ-1 и КЭ-2 отражают гемипелагическую седиментацию без влияния и с влиянием придонных течений, соответственно, а КЭ-3 с модой в области мелкозернистого песка характеризует ГР материала ледового разноса. Реконструированы механизмы поступления терригенного материала на хребет Ширшова ‒ адвекция взвеси в составе поверхностных и промежуточных водных масс и ледовый разнос. Оценена относительная роль обоих механизмов терригенного осадконакопления в условиях изменчивых скоростей придонных течений для интервалов максимума последнего оледенения, ранней дегляциации, события Хайнриха 1, беллинга/аллереда, позднего дриаса и раннего голоцена. Выявлена зависимость гранулометрического состава терригенной составляющей осадков от климатических изменений, ледовитости, путей дрейфа и условий таяния припайного льда, подвижности придонных вод. Над южной частью хребта во второй половине события Хайнриха 1, вероятно, существовали условия с плотным скоплением дрейфующих льдов или сплошным ледовым покровом. При малой подвижности придонных вод происходило только подледное гемипелагическое осаждение тонких фракций из фонового резерва взвеси. Резкое сокращение поступления материала ледового разноса реконструировано для интервала потепления белинга/аллереда. Придонные течения влияли на осадконакопление в центральной части хребта в течение всей дегляциации (кроме второй половины события Хайнриха 1), а в его южной части — в беллинге/аллереде, позднем дриасе и раннем голоцене.</p></trans-abstract><kwd-group xml:lang="en"><kwd>grain size</kwd><kwd>end members</kwd><kwd>hemipelagic sedimentation</kwd><kwd>sea ice rafting</kwd><kwd>bottom currents</kwd><kwd>paleoenvironments</kwd><kwd>climate change</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гранулометрия</kwd><kwd>конечные элементы</kwd><kwd>гемипелагическая седиментация</kwd><kwd>ледовый разнос</kwd><kwd>придонные течения</kwd><kwd>палеообстановки</kwd><kwd>климатические изменения</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Shirshov Institute of Oceanology, Russian Academy of Sciences</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Институт океанологии им. 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