Lamproite and kimberlite of the Sayany area: Composition, sources, and diamond potential

Egorov, K. N.; Kiselev, A. I.; Men'shagin, Yu. V.; Minaeva, Yu. A.

doi:10.1134/s1028334x10120251

Cited by 13 publications

(16 citation statements)

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“…1), которые имеют возраст 350-360 Ма [Agashev et al, 2004350-360 Ма [Agashev et al, , 2013Kostrovitsky et al, 2007;Smelov, Zaitsev, 2013;Sun et al, 2014], за исключением Толуопского (417-400 млн) лет [Sun et al, 2018]. Дальнейшим продолжением являются Мура-Ковинские и Туманшетские шлиховые ареалы (поля), вероятно, образованные кимберлитами или лампроитами девонского возраста [Sekerin и др., 1988[Sekerin и др., , 1993Egorov et al, 2006Egorov et al, , 2010.…”

Section: тектоническое районирование сибирского кратона и соотношениеunclassified

Mantle Terranes of the Siberian Craton: Their Interaction With Plume Melts Based on Thermobarometry and Geochemistry of Mantle Xenocrysts

Ashchepkov

Ivanov²,

Kostrovitsky

et al. 2019

Geodin. tektonofiz.

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We have studied variations in the structure and composition of minerals from the pipes of the Yakutian kimberlite province (YKP) in different mantle terranes of the Siberian craton. The study was based on an extensive database, including the microprobe analysis datasets consolidated by IGM, IG, IEC and IGDNM SB RAS and ALROSA and geochemical analysis of minerals performed by LA-ICP-MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry). The reconstruction shows layering under the tubes, including 6-7 slab that were probably formed due to subduction; the slabs are separated by pyroxenitic, eclogitic and metasomatic layers and dunite lenses. Transects and mantle profiles across kimberlite fields are constructed. Within the limits of the revealed tectonic terranes, we assume a collage of microplates formed in the early-middle Archean. Extended submeridional structures of the tectonic terranes are not always confirmed at the mantle level. Beneath the Anabar and Aldan shields, the mantle sections show more coarse layers and 3-4 large horizons of dunites with garnet and pyroxene nests separated by ilmenite-phlogopite metasomatites and pyroxenites. Terranes representing the suture zones between the protocratons (e.g. Khapchan) are often saturated with eclogites and pyroxenites that may occur as leghthy ascending bodies of magmatic eclogites penetrating through the mantle lithosphere structure (ML). A nearly ubiquitous pyroxenite layer at the level of 3.5-4.5 GPa formed probably in the early Archean with a high heat flux during melting of eclogites and was subsequently traced by plume melts. Within the early Archean protocratons-granite-greenstone terranes (Tungus, Markha, Berekta, and Sharyzhalgai, ~3.8-3.0 Gyr [Gladkochub et al., 2019], the mantle lithosphere is less depleted and largely metasomatized. The ML structure of the Daldyn and Magan granulite-orthogneiss terranes is layered with folding revealed in the north-to-south sections from the Udachnaya pipe to the Krasnopresnenskaya pipe, which is less pronounced in the latitudinal direction. From the Daldyn field to the Alakit field, there is an increase in the degree of metasomatism, and higher alkalinity of pyroxenes and larger amounts of phlogopite are noted. The most productive Aikhal and Yubileinaya pipes are confined to a dunite core, which is accompanied by a change in the specialization of high-charge elements Ta-Nb to Zr-Hf. Within the limits of the Magan terrane, the thin-layer structure of the middle GEODYNAMICS & TECTONOPHYSICS

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Section: тектоническое районирование сибирского кратона и соотношениеunclassified

Mantle Terranes of the Siberian Craton: Their Interaction With Plume Melts Based on Thermobarometry and Geochemistry of Mantle Xenocrysts

Ashchepkov

Ivanov²,

Kostrovitsky

et al. 2019

Geodin. tektonofiz.

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“…Присаянская минерагеническая зона является пер спективным регионом в отношении обнаружения рос сыпной и коренной алмазоносности различных гене тических типов [Egorov et al, 2010b]. В пределах Вос точного Присаянья выделяется несколько этапов вне дрения лампроитов и кимберлитов: мезопротерозой (средний рифей, около 1200 млн лет), неопротерозой (венд, около 630 млн лет) и средний палеозой (девон, около 370 млн лет).…”

Section: иркутской областиunclassified

“…Ранее алмазоносность калиевых мантийных пород была установлена только для среднерифейских лам проитов Ингашинского поля [Egorov et al, 2005]. В 2008 г. в одной из даек лампроитоидов среднепалео зойского возраста бассейна р. Бирюсы после термо химического разложения 25 кг материала пробы клас са -0.5 мм извлечены 10 микроалмазов размером 0.1-0.5 мм [Egorov et al, 2010b]. Все кристаллы про зрачны, окрашены в интенсивный желтый, зеленовато желтый цвет.…”

Section: иркутской областиunclassified

Mikhail M. Odintsov’s contribution to development of the mineral and raw materials complex of the Eastern Siberia

Egorov¹

2011

Geodyn. Tectonophys.

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The publication is devoted to the role of Mikhail M. Odintsov, Corresponding Member of the USSR Academy of Sciences, and his scientific school in solution of fundamental problems related to regularities of occurrence of endogenic mineral resources at ancient platforms. Based on mineragenic zonation data on the southeastern segment of the Siberian platform, Mikhail M. Odintsov determined the location of the AngaroViluisky ore belt that controls deposits and ore occur rences of magnetite, sulfates of copper and nickel, gold, base metals, barite, сelestine, and diamonds. Fundamental concepts proposed and developed by Mikhail M. Odintsov contributed significantly to studies of structures and evolution of ancient platforms and facilitated development of modern forecasting concepts concerning exploration of primary and alluvial depos its of diamonds in the southern part of the Siberian craton.

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“…Территория Восточного Присаянья на югозападе Сибирской платформы является одним из регионов, перспективных для обнаружения россыпных и корен ных месторождений алмазов [Egorov et al, 2010;Odintsov et al, 1962;Pokhilenko et al, 2012]. Здесь выделяют ся три основных этапа калиевого ультраосновного ще лочного магматизма: мезопротерозойский (~1200 млн лет), неопротерозойский (~620-650 млн лет) и сред непалеозойский (~370 млн лет) [Egorov et al, 2010;Sekerin et al, 1995;Ashchepkov et al, 2020;Doroshkevich et al, 2016].…”

Section: Introductionunclassified

Kimberlite-Like Rocks of the Urik-Iya Graben, Eastern Sayan Region: Mineral Composition, Geochemistry and Formation Conditions

Савельева

Данилова

Базарова

et al. 2020

Geodin. tektonofiz.

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Lamproite and kimberlite of the Sayany area: Composition, sources, and diamond potential

Cited by 13 publications

References 1 publication

Mantle Terranes of the Siberian Craton: Their Interaction With Plume Melts Based on Thermobarometry and Geochemistry of Mantle Xenocrysts

Mantle Terranes of the Siberian Craton: Their Interaction With Plume Melts Based on Thermobarometry and Geochemistry of Mantle Xenocrysts

Mikhail M. Odintsov’s contribution to development of the mineral and raw materials complex of the Eastern Siberia

Kimberlite-Like Rocks of the Urik-Iya Graben, Eastern Sayan Region: Mineral Composition, Geochemistry and Formation Conditions

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