Early Paleozoic alkaline magmatism of the Altai Mountains: 40Ar-39Ar geochronology data for the Edel’veis complex

Isotope (U–Pb, Sm–Nd, Rb–Sr) geochronology of alkaline basic plutons of the Kuznetsk Alatau

“…These ages fall in the interval ~470-510 Ma typical of many products of the CAFB magmatism united into an Early Paleozoic Large Igneous Province (Izokh et al, 2007;Vladimirov et al, 1999b;Vrublevskii et al, 2009Vrublevskii et al, , 2012a. Most of these rocks formed from mantle plume.…”

Alkaline magmatism of the Vitim province, West Transbaikalia, Russia: Age, mineralogical, geochemical and isotope (О, C, D, Sr and Nd) data

“…The latter includes the nepheline syenites and alkaline syenites of the Botogol and Khushagol massifs (520-492 Ma; Nikiforov and Yarmolyuk, 2007), the nepheline syenites of the Tazheransky massif (470 Ma; Sklyarov et al, 2009), and the alkaline syenites of the Dzhargalantsky massif (490 Ma; Kozakov et al, 2003). In addition to syenites, the ultrabasic alkaline complexes with carbonatites in the Kuznetsky Alatau and in the Gorny Altay were formed during this time interval (510 and 507-470 Ma, respectively; Vrublevsky et al, 2003Vrublevsky et al, , 2004Vrublevsky et al, , 2009). According to Kuzmin et al (2010), intense intraplate magmatism resulted from mantle hot spot activity.…”

Paleozoic large igneous provinces of Northern Eurasia: Correlation with mass extinction events

“…3 of this study links such extinctions with Eurasian magmatic provinces, assuming that the LIPs from Table 1 are manifestations of possibly even larger events in the ocean. In Eurasia, only the Cambrian Central Asian area of intraplate magmatism does not satisfy the definition of an LIP because of its diminutive size (Yarmolyuk et al, 2002Vrublevskii et al, 2009). The event occurred in the ocean and the remains are limited to the magmatic realm exposed in the fragments of the TuvaMongolian composite terrane (Kuzmin et al, 2010).…”

“…They used geochronological and geochemical data from picritic, gabbroid, and alkali basalt associations to characterize the age of the plume magmatism. Vrublevskii et al (2009) obtained new 40 Ar-39 Ar and Sm-Nd data from a volcanic complex that demonstrate that the magmatic province developed mostly between 510 and 470 Ma. The time interval is still too large to conclude firmly the correspondence to the mass extinction at the end of the Cambrian Period.…”

“…Kuzmin et al (2010) summarized the data that demonstrate that gigantic granite massifs were formed in a few phases by both the mantle plume and subduction related magmatism. Basic magmatism is present in Central Asian terranes of various thickness and evolutionary histories in the lithosphic mantle: Gorny Altay, Salair, Western Sayan, Kuznetsk Ala-Tau, Gornaya Shoria, Western Mongolia (island arc terrains), and Eastern Sayan (island arc and old rifting terrains) Vrublevskii et al, 2009). The approximate size of the province is > 0.3 × 10 6 km 2 and the magmatic volume (excluding granite massifs) is > 0.15 × 10 6 km 3 (estimated after Vrublevskii et al, 2009).…”