Affiliation:
1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
2. Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Abstract
Melt inclusions in the minerals of a sample from a dolerite dike of the Vilyui-Markha dike swarm, located on the northwestern shoulder of the Vilyui paleorift, have been studied. Data on the composition of homogeneous glasses of melt inclusions in minerals made it possible to establish the PT-parameters of mantle sources of initial deep melts responsible for the formation of gabbro-dolerites of the Vilyui paleorift. Two levels of generation of initial melts for dolerites have been established: in the intervals of 95–65 km at 1480–1400°C and 55–45 km at 1360–1320°C. The presence of two intermediate chambers in the crust, where melts crystallized, was identified at depths of about 12 and 9–4 km with a decrease in temperature to 1175–1125°С. The two-level arrangement of magma generation centers, as well as the heterogeneity of the chemical composition of the studied minerals, makes it possible to explain the presence of two pulses of Devonian basic magmatism.
Publisher
The Russian Academy of Sciences
Reference20 articles.
1. Гайдук В.В. Вилюйская среднепалеозойская рифтовая система. Якутск: ЯФ СО АН СССР, 1988. 126 с.
2. Полянский О.П., Прокопьев А.В., Королева О.В., Томшин М.Д., Ревердатто В.В., Бабичев А.В., Свердлова В.Г., Васильев Д.А. Природа теплового источника базитового магматизма при формировании Вилюйского рифта на основе данных о возрасте дайковых поясов и численного моделирования // Геология и геофизика. 2018. Т. 59. № 10. С. 1519‒1541.
3. Kiselev A.I., Ernst R.E., Yarmolyuk V.V., Egorov K.N. Radiated rifts and dyke swarms of the middle Paleozoic Yakutsk plume of eastern Siberian craton // Journal of Asian Earth Sciences. 2012. V. 45. P. 1‒16.
4. Ernst R.E. Large igneous provinces // Cambridge Univ. Press, 2014. 653 p.
5. Polyansky O.P., Prokopiev A.V., Koroleva O.V., Tom-shin M.D., Reverdatto V.V., Selyatitskiy A.Yu., Travin A.V., Vasiliev D.A. Temporal correlation between dyke swarms and crustal extension in the middle Palaeozoic Vilyui rift basin, Siberian platform // Lithos. 2017. V. 282‒283. P. 45‒64.