The paper presents the first data on the geology of a series of mafic dikes emplaced in the volcanogenic sedimentary sequence composing the structure of Jeannette Island. We show that the island hosts two generations of dikes consisting of fine-grained dolerites. Both magmatic stages were followed by fold deformations. The youngest and weakly deformed dikes are none the less chloritized and serpentinized. However, we were able to obtain the first ever precise geochronological 40Ar/39Ar data for them. According to this analysis, the emplacement age of the intrusive complex of Jeannette Island is close to the Ediacaran (553.6 ± 10.3 Ma). The ages of several superimposed tectonothermal events were determined: Middle Ordovician (463.3 ± 11.7 Ma), Late Silurian (425.3 ± 8.7 Ma), Late Devonian (360.7 ± 8.3 Ma) and Early Carboniferous (341.3 ± 6.8 Ma).

Язык оригиналаанглийский
Страницы (с-по)219-223
Число страниц5
ЖурналDoklady Earth Sciences
Номер выпуска1
СостояниеОпубликовано - 1 мар. 2016


Подробные сведения о темах исследования «Geology and age of mafic magmatism on Jeannette Island (De Long archipelago)—Implications for paleotectonic reconstructions for the Arctic». Вместе они формируют уникальный семантический отпечаток (fingerprint).