Late Precambrian OIB magmatism in the Kuznetsk Alatau, Siberia: Geochemical features of the Kulbyurstyug Formation volcanics

Vrublevskii, V. V.; Kotelnikov, A. D.; Крупчатников, В. И.

doi:10.1134/s1028334x16080109

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Red points -compositions of the Irbistu River basalts; green field -late Precambrian OIB-type basalts of Kuznetsk Alatau [Vrublevskii et al, 2016]. a -TiO 2 /Yb -Nb/Yb [Pearce, 2008]: tholeiitic (Th) and alkaline (Alk) kinds of OIB, normal (N-MORB) and enriched (E-MORB) basalts of mid-ocean ridges (crosses mark average values) are distinguished.…”

Section: Fig 3 Geochemical Characteristics Of the Basalts From Diffmentioning

confidence: 99%

“…(Tb/Yb) PM ratio [Wang et al, 2002] is normalized to primitive mantle composition [Sun, McDonough, 1989] (see in the text). Average OIB composition is given according to [Sun, McDonough, 1989]; OIB KA -composition of oceanic islands basalts of Kuznetsk Alatau [Vrublevskii, Kotelnikov, Krupchatnikov, 2016]. Katun, Zasuryin complexes basalts (see references for fig.…”

Section: Fig 5 Nd-sr Isotope Systematics (A) Composition and Meltimentioning

confidence: 99%

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The role of earth mantle in the development of early Paleozoic oceanic islands volcanism (for the geochemical data of OIB from SE Altai Mountains)

Vrublevskii¹,

Крупчатников²,

Гертнер³

2017

Geosphere Research

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В юго-восточной части Горного Алтая (р. Ирбисту) среди раннепалеозойских метафлишоидов горноалтайской серии проявлены высокотитанистые К-субщелочные (TiO 2 3-4; Na 2 O+K 2 O 3,4-7,7 мас. %; K 2 O/Na 2 O до 1,8-2,2) базальты. По уровню обогащения большинством LILЕ и HFSЕ (Rb 30-40, Ba 240-377, Zr 350-485, Nb 55-100, REE 190-300 г/т) и фракционирования лантаноидов (La/Yb ≈ 12-14), величине индикаторных отношений (Nb/U 45-56; Th/La 0,11-0,13; Th/Nb 0,07-0,08; Rb/Nb 0,31-0,54; Ba/Nb 3-4,7; La/Nb 0,57-0,64) вулканиты сопоставимы с производными OIB-магматизма, имеющего внутриплитную плюмовую природу. Широкие вариации изотопного состава Nd и Sr (ε Nd Т 1,7-5,0; 87 Sr/ 86 Sr T 0,7026-0,7039, ε Sr T от -18 до +0,1) позволяют предположить гетерогенность источников мантийного базальтового расплава и исключить его взаимодействие с супракрустальным материалом. Об этом же свидетельствуют первичные отношения изотопов свинца 206 Pb/ 204 Pb 17,85, 207 Pb/ 204 Pb 15,49, 208 Pb/ 204 Pb 37,[35][36][37]62. Рассматривается вероятность магмогенерации в условиях смешения вещества умеренно деплетированной (PREMA) и обогащенной (ЕМ 1) мантии, но без участия HIMU-домена, нередко инициирующего OIB-вулканизм. Установленное в породах распределение LREE и HREE могло быть вызвано 7-8%-ным равновесным плавлением модельного гранатового лерцолита мантии, которое приводило к возникновению родоначальной магмы наподобие среднего OIB. Допускаются присутствие в источнике незначительного количества шпинели или смешение расплавов перидотита разного состава. Ключевые слова: вулканизм океанских островов, геохимия рассеянных элементов и изотопов Nd-Sr-Pb, мантия, генерация базальтовых магм, Горный Алтай.

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Section: Fig 3 Geochemical Characteristics Of the Basalts From Diffmentioning

confidence: 99%

Section: Fig 5 Nd-sr Isotope Systematics (A) Composition and Meltimentioning

confidence: 99%

The role of earth mantle in the development of early Paleozoic oceanic islands volcanism (for the geochemical data of OIB from SE Altai Mountains)

Vrublevskii¹,

Крупчатников²,

Гертнер³

2017

Geosphere Research

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Cambro-Ordovician Ultramafic-Mafic and Granitoid LIP of Kuznetsk Alatau

Изох

Vrublevskii

Kotelnikov

et al. 2020

Geological Tour of Devonian and Ordovician Magmatism of Kuznetsk Alatau and Minusinsk Basin

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The age and petrologic and geochemical conditions of formation of the Kogtakh gabbro–monzonite complex in the Kuznetsk Alatau

Vrublevskii

Kotelnikov

Изох

2018

Russian Geology and Geophysics

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We present new data on the U–Pb age of zircons, geochemistry of trace elements, and isotope (Nd, Sr, O) composition of rocks of the Kogtakh gabbro–monzonite complex on the eastern slope of the Kuznetsk Alatau Ridge. The established age of zircon in the rocks of the main intrusive phases (500–480 Ma) is taken as the time of formation of the Kogtakh complex in the Late Cambrian–Early Ordovician, during the accretion–collision stage of evolution of the Central Asian Orogenic Belt. The distribution and ratios of LILE and HFSE in the rocks suggest that the intrusions proceeded under interaction of the PREMA + EM/OIB mantle plume and the suprasubductional lithospheric IAB mantle. The mantle–crust interaction led to the heterogeneous isotopic composition of neodymium in the magma source (ɛNd(T) ~ 3.5–5.4). The mixing of different mantle and continental-crust materials resulted in an increase in isotope parameters: (87Sr/86Sr)T ~ 0.7039–0.7052, ɛSr(T) ~ 0–19, and δ18O ~ 6.5–8.8‰ (SMOW). The REE ratio in the least differentiated gabbroids indicates different depths of probable magma chambers and the formation of their primary (Tb/YbPM > 1.8) mafic melts at different degrees of melting of the model garnet peridotite.

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Late Precambrian OIB magmatism in the Kuznetsk Alatau, Siberia: Geochemical features of the Kulbyurstyug Formation volcanics

Cited by 4 publications

References 8 publications

The role of earth mantle in the development of early Paleozoic oceanic islands volcanism (for the geochemical data of OIB from SE Altai Mountains)

The role of earth mantle in the development of early Paleozoic oceanic islands volcanism (for the geochemical data of OIB from SE Altai Mountains)

Cambro-Ordovician Ultramafic-Mafic and Granitoid LIP of Kuznetsk Alatau

The age and petrologic and geochemical conditions of formation of the Kogtakh gabbro–monzonite complex in the Kuznetsk Alatau

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