Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons

Ashchepkov, Igor; Vladykin, N. V.; Ntaflos, Theodoros; Downes, Hilary; Mitchell, Roger H.; Smelov, Alexander P.; Alymova, N. V.; Kostrovitsky, Sergey; Rotman, A. Ya.; Smarov, G.P.; Makovchuk, Igor; Stegnitsky, Yu.B.; Nigmatulina, E. N.; Khmelnikova, O. S.

doi:10.1016/j.gr.2012.03.009

Cited by 39 publications

(41 citation statements)

References 97 publications

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“…The group of clinopyroxenes with elevated FeO (3e5 wt.%) is characterized by comparatively low Cr 2 O 3 and higher Na 2 O and TiO 2 contents of some grains. Such values are common for pyroxene from Fe-rich metasomatites of the lithosphere base (Ionov et al, 2010;Ashchepkov et al, 2013a). Cr-diopsides from the Malysh pipe are more magnesian.…”

Section: Mineralogymentioning

confidence: 92%

“…REE patterns and TRE spidergrams for the melt parental for the minerals from deep seated xenocrysts from the kimberlite pipes Universitetskaya pipe of Kuranakh field. (Ashchepkov et al, , 2013a pipes and in other regions. Deeper in the range from 5.0 to 3.5 GPa, the joint PT estimates for garnets and ilmenites indicate the presence of metasomatic ilmenite peridotites, judging by the agreement of calculations of Fe # in Ol equilibrated with ilmenites and garnets.…”

Section: Ptxf(o 2 ) Conditions Beneath Kharamai Field and Prianabariementioning

confidence: 99%

“…After the Mesoproterozoic break-up stage of Columbia, at 1.1e0.6 Ga Siberia became part of the next supercontinent Rodinia (Griffin et al, 2002;Pearson et al, 2005;Rosen et al, 2006;Mints, 2007;Maruyama et al, 2013). A preliminary study of mantle layering and compositions supports the idea of differences of subcontinental lithosphere mantle (SCLM) (Ashchepkov et al, 2013a) beneath each tectonic terrane in Siberia (Gladkochub et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

“…The mantle layering reconstructions and general geochemical characteristics of the minerals provide the typical features of the different terranes and their distinct parts (Ashchepkov et al, 2013a). By comparing the PTXf(O 2 ) diagrams used for reconstructions of SCLM beneath the studied fields, we investigate the similarity of the mantle structure within the Magan terrane and differences with the SCLM in other tectonic units of the Siberian craton.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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a b s t r a c tMantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle (SCLM). Pressure-temperature (PT) reconstructions using monomineral thermobarometry for 5 phases show division of the SCLM beneath the Kharamai field into 6 units: pyroxenitic Fe-rich (1e2 GPa) and Mg-rich (2e3 GPa) layers; middle with two levels of Gar-Sp pyroxenites at w3 and 4e5 GPa; Gar-duniteeharzburgites w4.5e6.5 GPa subjected to Ilm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield (Ary-Mastakh, Dyuken and Kuranakh fields) mantle lithosphere is composed of three large units divided into two parts: upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe # Gar clusters for garnets and omphacites illustrate the differences between SCLM of these localities. Differences of Triassic SCLM from Devonian SCLM are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLM base to 5.0 GPa.Kharamai mantle clinopyroxenes represent three geochemical types: (1) harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; (2) lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; (3) eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less inclined REE patterns with HMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and Sr, similar to those in ophiolitic harzburgites. The PT diagrams for the mantle sections show high temperature gradients in the uppermost SCLM accompanied by an increase of P-Fe # Ol upward and slightly reduced thickness of the mantle keel of the Siberian craton, resulting from the influence of the PermianeTriassic superplume, but with no signs of delamination.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Mineralogymentioning

confidence: 92%

Section: Ptxf(o 2 ) Conditions Beneath Kharamai Field and Prianabariementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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“…Сложное строение литосферной мантии под Сибирским кратоном установлено по результатам изучения глубинных ксенолитов ультрамафитовых пород из кимберлитовых трубок и щелочных ба-зальтов, а также подтверждено результатами численного физико-химического моделирования [Sobolev et al, 2004;Шарапов и др., 2009, 2013Ashchepkov et al, 2013]. В.С.…”

Section: обсуждение результатовunclassified

MEIMECHITE-PICRITE ASSOCIATIONS IN SIBERIA, PRIMORYE, AND KAMCHATKA (comparative analysis and petrogenesis)

2014

GiG

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Анализ петрохимической и геохимической информации одного уровня, характеризующий поро-ды и первичные расплавные включения из оливинов разновозрастных меймечит-пикритовых ассоци-аций Сибири (Маймеча-Котуйская провинция), Приморья (Сихотэ-Алинь) и Камчатки, показал, что, несмотря на внешнее сходство и одинаковый структурный рисунок пород, они существенно различа-ются по содержаниям и распределению некогерентных и редкоземельных элементов, а также составу и трендам эволюции исходных высокотемпературных и высокомагнезиальных расплавов.Меймечит-пикритовые ассоциации, сравнительный анализ, геохимия, петрогенезис. MEIMECHITE-PICRITE ASSOCIATIONS IN SIBERIA, PRIMORYE, AND KAMCHATKA(comparative analysis and petrogenesis)Yu.R. Vasil'ev and M.P. Gora Analysis of petrochemical and geochemical information on rocks and primary melt inclusions from olivines of meimechite-picrite associations of different ages in Siberia (Maimecha-Kotui province), Primorye (Sikhote-Alin), and Kamchatka was made. It showed that the rocks, despite their similar appearance and identical structural patterns, differ considerably in the contents and distribution of incompatible and rare-earth elements and in the composition and evolution trends of parental high-temperature highly magnesian melts. Meimechite-picrite associations, comparative analysis, geochemistry, petrogenesis ВВЕДЕНИЕМеймечит-пикритовые ассоциации представляют интерес для петрологов как возможные индика-торы глубинных процессов генерации высокомагнезиальных пикритоидных расплавов, формирующих самостоятельные крупнообъемные проявления, а также ряды вулканических и интрузивных пород ма-фит-ультрамафитового состава, с которыми связаны различные рудные проявления и месторождения.Среди проявлений этих пород выделяются разнообразные по фациальной принадлежности, геоло-гическому положению и возрасту крупнообъемные образования на Сибирской платформе (СП), в При-морье и на Камчатке. Все породы имеют внешнее сходство и простой минеральный состав (по сути, они состоят из переменного количества вкрапленников магнезиального оливина и клинопироксена в основ-ной массе), хотя формируются в различных геодинамических обстановках. В нашем распоряжении име-ется большой объем оригинального фактического материала и данные из литературных источников. Это нам позволило провести сопоставление пород из исследуемых регионов по совокупности целого ряда признаков: по петрохимическим и геохимическим особенностям, в том числе по распределению редкоземельных элементов (РЗЭ), по изотопным отношениям, по результатам изучения первичных рас-плавных включений в породообразующих оливинах.Проведенный сравнительный анализ пород меймечит-пикритовых ассоциаций показал, что они имеют фактически одинаковый характер проявлений магматизма в виде вулканогенных образований, дайковых, пластовых тел и диатрем. Им свойственно внешнее сходство пород и близкое количествен-ное соотношение породообразующих минералов. При этом между собой они различаются по целому ряду петрохимических и главным образом геохимических признаков. В результа...

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Wyoming Craton Mantle Lithosphere: Reconstructions Based on Xenocrysts from Sloan and Kelsey Lake Kimberlites

Ashchepkov¹,

Downes

Mitchell

et al. 2013

Proceedings of 10th International Kimberlite Conference

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Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons

Cited by 39 publications

References 97 publications

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

MEIMECHITE-PICRITE ASSOCIATIONS IN SIBERIA, PRIMORYE, AND KAMCHATKA (comparative analysis and petrogenesis)

Wyoming Craton Mantle Lithosphere: Reconstructions Based on Xenocrysts from Sloan and Kelsey Lake Kimberlites

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