Hydrocarbons and other volatile components in alkaline rocks from the Ukrainian shield and Kola Peninsula

Bitumen biomarkers in the Mid-Proterozoic Ilímaussaq intrusion, Southwest Greenland – A challenge to the mantle gas theory

“…Even though methane observed in primary inclusions could be of magmatic origin (Beeskow et al, 2006), the evidence presented in this paper suggests that the much more abundant hydrocarbon gases in secondary inclusions as well as the bitumen dispersed in the rocks are most likely of biotic origin. Fluid inclusion studies performed on other alkaline rocks show little evidence of hydrocarbons (Kryvdik et al, 2007;Fall et al, 2007). Thus, given the evidence that the vast majority of hydrocarbons in the alkaline rocks on the Kola Peninsula and in Southwest Greenland are biotic in origin and not magmatic as assumed previously, the arguments for migration of hydrocarbons from a deep magmatic source to form economic accumulations of oil and gas at shallower depths seem vanishingly small.…”

The transformation of nepheline and albite into sodalite in pegmatitic mariupolite of the Oktiabrski Massif (SE Ukraine)

“…1.8 Ga [15,16]. The general geology and genesis were described in detail by Tichonienkova et al [17], Donskoy [18], Solodov [19], Krivdik et al [14] and Volkova [15,16]. It is composed mainly of alkali syenites and foyaites with minor amounts of mariupolite (i.e.…”

“…The massif, which is 34 km 2 in area [14], is a unique province of alkaline magmatism of Proterozoic age ca. 1.8 Ga [15,16].…”

Micas from mariupolite of the Oktiabrski massif (SE Ukraine): An insight into the host rock evolution – Geochemical data supported by Raman microspectroscopy

“…The massif, which is 34 km 2 in area [11], is a unique province of alkaline magmatism of Proterozoic age ca. 1.8 Ga [12,13] (Volkova 2000(Volkova , 2001.…”