Инд. авторы:	Novikova S.A., Murzintsev N.G., Travin A.V., Sokol E.V., Tulokhonov A.K.
Заглавие:	A New Approach to Ar-40/Ar-39 Dating of Combustion Events: A Case Study from the Late Pleistocene Coal Fires in Goose Lake Depression (Transbaikalia)
Библ. ссылка:	Novikova S.A., Murzintsev N.G., Travin A.V., Sokol E.V., Tulokhonov A.K. A New Approach to Ar-40/Ar-39 Dating of Combustion Events: A Case Study from the Late Pleistocene Coal Fires in Goose Lake Depression (Transbaikalia) // Doklady Earth Sciences. - 2018. - Vol.483. - Iss. 2. - P.1567-1570. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X18120206; SCOPUS: 2-s2.0-85060282974; WoS: 000456008500018;
Реферат:	eng: Based on the study results of combustion metamorphic (CM) rocks from the young (0.01-0.06 kyr) CM complex at the Goose Lake brown coal deposit, a new approach to Ar-40/Ar-39 dating of coal paleofires was substantiated. The results of Ar-40/Ar-39 dating of K-Na feldspars (0.10 +/- 0.16 Ma) from fragments of quartz syenites (initial age 285-305 Ma), enclosed in paralavas and heated by fire (T 950 degrees C) show that magmatic feldspars have lost all radiogenic argon during combustion event. As follows from the numerical modeling results, feldspars (diffusion domains of 100 m in size) can lose all radiogenic argon under heating (T = 950 degrees C) in five hours. The estimated data have proved that grains of detrital feldspars enclosed in sediments that were subject to heating must be completely degassed over the time of existence of large fire focus. It means that glassy (T 900 degrees C) CM rocks with relics of K-Na feldspars are applicable for correct Ar-40/Ar-39 dating of combustion metamorphic paleoevents. The abundance of such rocks in the CM sections promotes opportunities for geochronological reconstructions of the Late Cenozoic history of sedimentary basins.
Ключевые слова:	BASIN;
Издано:	2018
Физ. характеристика:	с.1567-1570