Geochemistry, isotope triad (Nd-Sr-O), and 40Ar-39Ar age of Paleozoic alkaline mafic intrusions of the Kuznetsk Alatau (by the example of the Belaya Gora pluton)

V. V. Vrublevskii, O. M. Grinev, A. E. Izokh, A. V. Travin

Результат исследования: Научные публикации в периодических изданияхстатья

9 Цитирования (Scopus)

Аннотация

We report the first data on 40Ar/39Ar dating, trace-element geochemistry, and isotope (Nd, Sr, O) composition of the Belaya Gora gabbro-foidolite-foyaite intrusive massif, one of typical representatives of the alkaline province of the northeastern Kuznetsk Alatau. The established age of rock-forming amphibole, ~401-403 Ma, is taken as the time of the pluton formation in the Early Devonian. The distribution and ratios of LILE and HFSE in the rocks suggest that the intrusion took place in the setting of "superposition" of Devonian mantle plume on the Early Paleozoic accretion-collision complexes. Therefore, the source of magmatic products had a heterogeneous composition as a result of mixing of plume material with the substances of suprasubduction and crustal substrates. The mantle component might have been a PREMA + EM combination, which is confirmed by the parameters of the Nd isotope composition (εNdT - 3.2-4.6; TNd(DM) - 0.8 Ga) of alkaline rocks. 87 86 18 The effects of crustal contamination are reflected in the high ratios of strontium and oxygen isotopes ( Sr/ Sr)T - 0.7046-0.7054; 5 O - 8.5-9.2%c, SMOW).

Язык оригиналаанглийский
Страницы (с-по)464-472
Число страниц9
ЖурналRussian Geology and Geophysics
Том57
Номер выпуска3
DOI
СостояниеОпубликовано - 1 мар 2016

Fingerprint Подробные сведения о темах исследования «Geochemistry, isotope triad (Nd-Sr-O), and <sup>40</sup>Ar-<sup>39</sup>Ar age of Paleozoic alkaline mafic intrusions of the Kuznetsk Alatau (by the example of the Belaya Gora pluton)». Вместе они формируют уникальный семантический отпечаток (fingerprint).

Цитировать