Melting Conditions of Granitoid Xenoliths in Contact With Alkaline Mafic Magma (Gusinoozerskaya Dyke, Western Transbaikalia): To the Problem of the Origin of Ultrapotassic Acid Melts

Хубанов, В. Б.; Врублевская, Т. Т.; Цыганков, А. А.; Владимиров, А. Г.; Буянтуев, М. Д.; Sokolova, E. N.; Посохов, В. Ф.; Хромова, Е. А.

doi:10.5800/gt-2017-8-2-0245

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Это позволило в свое время предположить, что их происхождение связано с глубокой дифференциа-цией гранитоидных расплавов на фоне интенсив-ных сдвиговых деформаций, как это было показано для стресс-гранитов зоны Анга-Сахюрты в Ольхон-ском метаморфическом террейне [Makrygina, Petrova, 1996;Vladimirov et al, 2004]. Однако сейчас по-явились новые геохимические данные о подплав-лении метапелитовых ксенолитов в базальтовом расплаве [Khubanov et al, 2017], где тонкие пленки кремнекислого расплава, образующегося на грани-це кварца и калиевого полевого шпата, имеют химический состав, очень близкий к стресс-гра-нитам Чернорудской зоны. Эти «природные экспе-рименты» прямо указывают на то, что под черно-рудскими гранулитовыми толщами существовал Т а б л и ц а 10.…”

Section: синметаморфические граниты чернорудской зоныunclassified

Mechanisms of Mantle‐crust Interaction at Deep Levels of Collision Orogens (Case of the Olkhon Region, West Pribaikalie)

Владимиров¹,

Мехоношин²,

Хромых³

et al. 2017

Geodin. tektonofiz.

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Abstract:In the Chernorud granulite zone in the Olkhon region of West Pribaikalie, we studied gabbro-pyroxenites composing tectonic plates (Chernorud, Tonta) and synmetamorphic intrusive bodies (Ulan-Khargana), as well as numerous disintegrated boudins and inclusions embedded in the metamorphic matrix. Based on the results of comparative analysis of the chemical compositions, the gabbro-pyroxenites are classified into a single island-arc tholeiitic series. The COMAGMAT software was used to simulate this series and to estimate the initial composition of the parent magma (magnesian basalt: SiO2=46.0 wt. %, TiO2=0.8 wt. %, Al2O3=15.3 wt. %, ΣFeO=9.0 wt. %, MnO=0.15 wt. %, MgO=10.5 wt. %, CaO=17.0 wt. %, Na2O=1.0 wt. %, K2O=0.2 wt. %, P2O5=0.05 wt. %, total = 100.0 %, Mg# = 67.5 %). It is concluded that the granulite metamorphism (P=7.7 to 8.6 kbar, T=770 to 820 °C) was due not only to dipping of the initial sedimentary-volcanic series to a depth of 25-28 km, but also to the presence of a deep chamber of magnesian basalt magma. In our estimations, garnet-pyroxenites (i.e. mafic rocks of the top facies in the above-mentioned chamber) originated at P=8.0-8.3 kbar and T=900-930 °C. Considering petrology, the deep mafic chamber under the layer of granulite facies is evidenced by metamorphic magma mingling, as well as pipe-shaped intrusions characterized by the specific morphology, internal structure and bulk rock compositions. Based on the data on the Ulan-Khargana massif and gabbro-pyroxenite bodies involved in the structure of the marble melange, we propose a petrological model showing two stages of mafic injection -Stage 1: hydraulic fracturing of granulite series and the emergence of tubular structures and bodies, which are similar to kimberlite pipes or channels of different shapes; Stage 2: rising of the fluidized residual alkaline melt through the emerging 'pipes' and fractures armored by hardened zones, which is followed by metamorphic magma mingling under viscous deformation conditions. The mafic magmas intruding to the

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Section: синметаморфические граниты чернорудской зоныunclassified

Mechanisms of Mantle‐crust Interaction at Deep Levels of Collision Orogens (Case of the Olkhon Region, West Pribaikalie)

Владимиров¹,

Мехоношин²,

Хромых³

et al. 2017

Geodin. tektonofiz.

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“…Особое место в этом цикле статей занимают де-тальные исследования гранитоидных ксенолитов в контакте с щелочно-базитовой магмой на гипабис-сальном уровне глубинности [Khubanov et al, 2017]. Эти исследования показывают активную роль щелочно-хлоридного и/или щелочно-углекислого флюида, выделявшегося из кристаллизующейся вмещающей щелочно-основной магмы и в конеч-ном итоге приводящего к формированию аномаль-ных по составу ультракалиевых кремнекислых расплавов.…”

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“…Второй раздел представлен статьей [Buyantuev et al, 2017], в которой рассмотрены методические особенности U-Pb LA-ICP-MS датирования цирко-нов в контрастных по составу бимодальных сериях и подтверждает субсинхронность сосуществования базитовых и кремнекислых расплавов. Термохро-нологический подход, основанный на U-Pb и Ar-Ar датировании, описан в статье [Vladimirov V. et al, 2017], в которой синплутонические комбиниро-ванные дайки рассматриваются как независимые геологические критерии для тестирования мине-ралов-геохронометров.…”

unclassified

Mingling Processes in the Earth's Crust: Geological Observations and Mathematical Simulation

Владимиров¹,

Владимиров²,

Polyansky³

2017

Geodin. tektonofiz.

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This issue of Geodynamics & Tectonophysics presents the state-of-the-art studies of mingling processes and investigations of the interactions between the mafic and acidic melts of contrasting compositions at various depths of the Earth's crust. The diagnostic features and the genesis of magmatic and synmetamorphic mingling are discussed with respect to the reference objects of Altaides and Uralides. Several papers report on the results of mathematical simulation used to discover the mechanism for lifting the high-density basite inclusions in a chamber or a dyke filled with salic magma. This special issue is intended for researchers and specialists in geology, petrology and geodynamics of magmatic processes in the crust, as well as for lecturers, post-graduate students and university students.

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Nutrients, Organic Matter, and Trace Elements in Lake Gusinoe (Transbaikalia)

Khazheeva

Plyusnin

Смирнова

et al. 2021

Water

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Lake Gusinoe is the second largest freshwater lake in Transbaikalia. Lakes serve as a source for drinking water, irrigation, and as a water source for the electricity, aquatic production, and tourism industry. Currently variations of content nutrients and organic matter differ in different areas of the lake. The content of total nitrogen, phosphorus, organic matter, and dissolved oxygen are distinguished more than 1.2–2.0 times. In accordance with the behavior of elements in the water, three groups of elements can be distinguished. The first group of elements, including Li, Ga, Ge, As, Rb, Sr, Mo, Cd, W, and U, were directly correlated with variations of major elements. The first group of elements showed decreasing concentrations with an increasing amount of total dissolved salt (TDS). The second group of elements, including Fe, Y, Nb, Th, and REE, were correlated oppositely with variations of TDS. The behavior of the third group of elements, including Mn, Zn, Ni, Cu, and Pb, decoupled with TDS. The value of the Eu anomaly was positively correlated with TDS. The water of Lake Gusinoe was extremely enriched by W, Mo, V, U, Li, Sr, and Ga; moderately by Ni, Cu, Ge, As, Rb, Cd, and Pb; and minimally by Al, Cr, Mn, Fe, Co, Zn, Y, Th, and REE.

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Melting Conditions of Granitoid Xenoliths in Contact With Alkaline Mafic Magma (Gusinoozerskaya Dyke, Western Transbaikalia): To the Problem of the Origin of Ultrapotassic Acid Melts

Cited by 3 publications

References 26 publications

Mechanisms of Mantle‐crust Interaction at Deep Levels of Collision Orogens (Case of the Olkhon Region, West Pribaikalie)

Mechanisms of Mantle‐crust Interaction at Deep Levels of Collision Orogens (Case of the Olkhon Region, West Pribaikalie)

Mingling Processes in the Earth's Crust: Geological Observations and Mathematical Simulation

Nutrients, Organic Matter, and Trace Elements in Lake Gusinoe (Transbaikalia)

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