litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2021-21-3-323-348litosphere-1445Research ArticleСтатьиArticlesМелилит-оливиновые нефелиниты субвулканического тела Табат (Махтеш Рамон, Израиль): геолого-петрографическая и геохимическая характеристика и условия образованияMelilite-olivine neрhelinites of Mt. Tabaat (Makhtesh Ramon, Israel): Geological, petrographic and geochemical characteristics and conditions of genesisЮдалевичЗ.YudalevichZ. A.

Р.О.В. 653, Беар-Шева, 84105, Израиль

P.O.B. 653, Beer-Sheva, 84105 Israel

zinovi@bgu.ac.ilВапникЕ.VapnikV. A.

Р.О.В. 653, Беар-Шева, 84105, Израиль

P.O.B. 653, Beer-Sheva, 84105 Israel

vapnik@bgu.ac.ilВишняковаМ. Д.VishnyakovaM. D.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15

15 Akad. Vonsovsky st., Ekaterinburg 620016, Russia

vishniakovamd@igg.uran.ruБородинаН. С.BorodinaN. S.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15

15 Akad. Vonsovsky st., Ekaterinburg 620016, Russia

borodina@igg.uran.ruДепартамент геологических и минералогических наук, Университет им. Бен-ГурионаИзраильDepartment of Geological and Environmental Sciences, Ben-Gurion University of the NegevIsraelИнститут геологии и геохимии УрО РАНРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, Uralian Branch of RASRussian Federation202107072021213323348Copyright © Юдалевич З.A., Вапник Е.A., Вишнякова М.Д., Бородина Н.С., 20212021Юдалевич З., Вапник Е., Вишнякова М.Д., Бородина Н.С.Yudalevich Z.A., Vapnik V.A., Vishnyakova M.D., Borodina N.S.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1445Объект исследований

Объект исследований. Мелилит-оливин-нефелинитовое субвулканическое тело Табат, в составе которого впервые на территории Леванта были установлены мелилитовые породы.

Материалы и методы

Материалы и методы. Изучение химических составов минералов (около 400 анализов) было произведено на микроанализаторе CAMECA SX-100, оснащенном пятью волновыми спектрометрами с кристалл-анализаторами TAP, LPET, LLIF. Измерение элементного состава было выполнено при ускоряющем напряжении 15 кВ, токе пучка электронов 40 нА. Концентрация кислорода рассчитывалась из условия стехиометричности состава силикатных минералов и хромита. Кроме того, были использованы результаты ранее проведенных исследований минералов (150 анализов) и данные по расплавным включениям.

Результаты

Результаты. Субвулканическое тело Табат, входящее в состав раннемеловой оливин-базальт-базанит-нефелинитовой ассоциации Махтеш Рамона (Негев, Израиль), имеет сложное концентрически- зональное строение c оливиновыми меланефелинитами в периферической зоне, мелилит-оливиновыми меланефелинитами в центральной и связующей их зоне ларнит-нормативных и, реже, мелилитсодержащих меланефелинитов. В породах широко проявлена призматическая отдельность. Складкообразное изгибание и вогнуто-выгнутые грани призм являются отражением пластического состояния охлаждающегося тела и его способности к сжатию и аккомодации высокого давления флюидов, развивающегося при образовании мелилитовых нефелинитов.

Выводы

Выводы. Все минеральное разнообразие пород субвулканического тела горы Табат является производной одной порции магматического расплава в условиях его адиабатического охлаждения в месте стабилизации. Особая роль в процессе кристаллизации массива принадлежит минералам с высоким содержанием воды – анальциму, цеолитам, иддингситам, боулингитам и сапонитам-селадонитам, которые указывают на дейтерическую стадию его развития. Изучение расплавных включений в оливине и клинопироксене показало преемственность их состава по отношению к составу вмещающих мелилитовых нефелинитов и значение инконгруэнтного плавления при образовании мелилита, являющегося продуктом реакции нефелина с оливином или клинопироксеном.

Research subject

Research subject. The melilite-olivine nephelinite subvolcanic body Tabaat, which includes melilite rocks found for the first time on the territory of Levant.

Materials and methods

Materials and methods. The chemical composition of minerals (about 400 analyzes) was determined out on a CAMECA SX-100 microanalyzer equipped with five wave spectrometers with crystal analyzers TAP, LPET and LLIF. The elemental composition was measured at an accelerating voltage of 15 kV, an electron beam current of 40 nA. The oxygen concentration was calculated from the condition of stoichiometric composition of silicate minerals and chromite. In addition, the results of earlier studies of minerals (150 analyses) and data on melt inclusions were used.

Results

Results. The Tabaat subvolcanic body, which is part of the Early Cretaceous olivine-basalt-basanite-nephelinite association Makhtesh Ramona (Negev, Israel), has a complex concentrically-zonal structure, with olivine melanephelinites in the peripheral zone, melilite-olivine melanephelinites in the central and connecting zones normative and, less often, melilite-containing melanephelinites. Prismatic separation is widely manifested in the rocks. The fold-like bending and concave-curved edges of the prisms are a reflection of the plastic state of the cooling body and its ability to compress and accommodate a high fluid pressure, which develops during the formation of melilite nephelinites.

Conclusion

Conclusion. All mineral diversity of rocks of the Mt. Tabaat is a derivative of a single portion of magmatic melt under conditions of its adiabatic cooling at the place of stabilization. A special role in the course of crystallization of the massif belongs to minerals with a high water content – analcime, zeolites, iddingsites, bowlingites and saponite-celadonites, which indicate the deuteric stage of its development. The study of melt inclusions in olivine and clinopyroxene showed the continuity of their composition with the composition of host melilite nephelinites and the importance of incongruent melting during the formation of melilite, which is a product of the reaction of nepheline with olivine or clinopyroxene.

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The authors declare that there are no conflicts of interest present.