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The ca. 1.8 Ga mantle plume related magmatism of the central part of the Ukrainian shield
Naturhistoriska riksmuseet, Enheten för geovetenskap.
Vise andre og tillknytning
2016 (svensk)Inngår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, s. 86-101Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Palaeoproterozoic (ca. 1.8 Ga) mafic and ultramafic dykes are widely distributed within thewhole Sarmatian segment of the East-European craton. This paper focuses on new geochronological,geochemicaland isotope data obtained for mafic and ultramafic dykes of the Ingul terrain. Geochronological data available for these dykes indicate ages around 1800 Ma. We provide a new U–Pb zircon age of1810 ± 15 Ma obtained for a dolerite dyke in the Kirovograd area. Geochemical and petrographical dataallow identification of three groups of dykes: (1) kimberlites, (2) high-Mg# subalkaline rocks (picrite,camptonite, subalkaline dolerite etc.) and (3) tholeiite dolerite. Rocks of these groups were probably derived from different sources. Eps-Nd1800 values of studied rocks vary from 0.7 to 2.8. The highest values were obtained for mantle xenoliths and their kimberlite host (Eps-Nd1800 = 2.5–2.8). Rb–Sr data yield aregressionage of 1729 ± 20 Ma with an initial 87Sr/86Sr = 0.70366 ± 41 (MSWD = 10.8). The whole-rock lead isotope data scatter, but data for sub-groups of samples can tentatively be fitted to parallel 1.8 Ga isochrons.The geochemical data indicate rocks to have formed by partial melting and the degree of melting is thought to be a function of formation depth, the latter ranging from sub-lithospheric to lower crustal levels; we assume that melting was caused by a mantle plume. Dyking in the Ingul terrain was closely associated in time and space with metasomatic albitites that host numerous economic U deposits.

sted, utgiver, år, opplag, sider
2016. Vol. 138, s. 86-101
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Identifikatorer
URN: urn:nbn:se:nrm:diva-1752OAI: oai:DiVA.org:nrm-1752DiVA, id: diva2:916337
Tilgjengelig fra: 2016-04-01 Laget: 2016-04-01 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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