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200 1 _aU-Pb Dating of Apatite, Titanite and Zircon of the Kingash Mafic-Ultramafic Massif, Kan Terrane, Siberia: From Rodinia Break-up to the Reunion with the Siberian Craton
_fA. E. Marfin, Tatiana Radomskaya, A. V. Ivanov [et al.]
203 _aText
_celectronic
300 _aTitle screen
330 _aThe initial stage of Rodinia supercontinent break-up occurred at about 750 Ma. It preceded formation of the Irkutsk and Franklin large igneous provinces (LIPs) at 712 ± 2 to 739 ± 8 Ma. These LIPs were emplaced within the formerly connected Laurentian and Siberian cratons. The Kingash massif is located in the Precambrian Kan terrane in direct contact with the Siberian Craton at its southwestern boundary. It has been linked to an important suite of mafic-ultramafic intrusions that border the southern margin of the Siberian craton, and that have been inferred to belong to the Irkutsk LIP. The massif is also significant, because it hosts platinum group element (PGE)-Cu-Ni-rich mineralization and is the only large deposit in the region. However, despite numerous dating attempts, the age of the massif had not been resolved. A significant difficulty is post-magmatic recrystallization at amphibolite facies that affected the rocks of the massif.
330 _aIn this study we used U-Pb dating of zircon, titanite and apatite from rocks of the Kingash massif and cross-cutting granite and monzonite veins. The oldest igneous zircon grain of the Kingash massif analysed by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) yields an age of c. 750 Ma, taken as a tentative age of magmatism. Dating of multiple grains of metamorphic zircon by chemical abrasion isotope dilution thermal ionization mass spectrometry yielded 564·8 ± 2·2 Ma, which is in agreement with LA-ICP-MS titanite ages of 557 ± 19, 565 ± 35 and 551 ± 17 Ma. Apatite of two different samples showed ages of 496·4 ± 7·9 and 497·0 ± 1·8 Ma (LA-ICP-MS), which are interpreted as the time when the terrane cooled below the closure temperature of apatite. Using our new data we suggest that at the time of the Irkutsk-Franklin LIP event the Kan terrane was a part of Rodinia, then it separated from either Siberia or Laurentia during the break-up of Rodinia and finally collided with Siberia at 560 Ma, the time of regional amphibole-facies metamorphism.
333 _aРежим доступа: по договору с организацией-держателем ресурса
461 _tJournal of Petrology
463 _tVol. 62, iss. 9
_v[egab049, 16 р.]
_d2021
610 1 _aэлектронный ресурс
610 1 _aтруды учёных ТПУ
610 1 _aапатиты
610 1 _aтитаниты
610 1 _aцирконы
610 1 _aКингашский массив
610 1 _aмагматизм
610 1 _aметаморфизм
701 1 _aMarfin
_bA. E.
_gAleksandr Evgenjevich
701 1 _aRadomskaya
_bTatiana
_gT. A.
701 1 _aIvanov
_bA. V.
_gAleksey Viktorovich
701 1 _aKamenetsky
_bV. S.
_gVadim
701 1 _aKamenetsky
_bM. B.
_gMaya
701 1 _aYakich
_bT. Yu.
_cgeologist
_cAssociate Professor of Tomsk Polytechnic University, Candidate of geological and mineralogical sciences
_f1984-
_gTamara Yurievna
_2stltpush
_3(RuTPU)RU\TPU\pers\43279
701 1 _aGertner
_bI. F.
_gIgor Fedorovich
701 1 _aKamo
_bS. L.
_gSandra
701 1 _aErnst
_bR. E.
_gRichard
701 1 _aBryansky
_bN. V.
_gNikolay Valerjevich
701 1 _aGlazunov
_bO. M.
_gOleg Mikhaylovich
701 1 _aBelozerova
_bO. Yu.
_gOlga Yurjevna
712 0 2 _aНациональный исследовательский Томский политехнический университет
_bИнженерная школа природных ресурсов
_bОтделение геологии
_h8083
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856 4 _uhttps://doi.org/10.1093/petrology/egab049
942 _cCF