Evidence for Multistage and Polychronous Alkaline-Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield)

Malkovets V.G.; Shatsky V.S.; Dak A.I.; Gibsher A.A.; Yakovlev I.V.; Belousova E.A.; Tsujimori T.; Sobolev N.V.

doi:10.1134/S1028334X21010141

Инд. авторы:	Malkovets V.G., Shatsky V.S., Dak A.I., Gibsher A.A., Yakovlev I.V., Belousova E.A., Tsujimori T., Sobolev N.V.
Заглавие:	Evidence for Multistage and Polychronous Alkaline-Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield)
Библ. ссылка:	Malkovets V.G., Shatsky V.S., Dak A.I., Gibsher A.A., Yakovlev I.V., Belousova E.A., Tsujimori T., Sobolev N.V. Evidence for Multistage and Polychronous Alkaline-Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield) // Doklady Earth Sciences. - 2021. - Vol.496. - Iss. 1. - P.48-52. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X21010141; WoS: 000625488500009;
Реферат:	eng: New mineralogical and isotope-geochemical data for zircon megacrysts (n = 48) from alluvium of Kholomolokh Creek (a tributary of the Ebelakh River) are reported. Using the geochemical classification schemes, the presence of zircons of kimberlitic and carbonatitic genesis was shown. The U-Pb dating of zircons revealed two major age populations: the Triassic (258-221 Ma, n = 18) and Jurassic (192-154 Ma, n = 30). Weighted mean Pb-206/U-238 ages allowed us to distinguish the following age stages: 155 +/- 3, 161 +/- 2, 177 +/- 1.5, 183 +/- 1.5, 190 +/- 2, 233 +/- 2.5, and 252 +/- 4 Ma. It is suggested that the Ebelyakh diamonds could have been transported from the mantle depths by kimberlite, as well as by other related rocks, such as carbonatite, lamprophyre, lamproite, olivine melilitite, etc. Diamonds from the Ebelyakh placers most likely have polygenic native sources and may be associated with polychronous and multistage Middle Paleozoic and Mesozoic kimberlite and alkaline-ultrabasic magmatism in the eastern slope of the Anabar Shield (the Ebelyakh, Mayat, and Billyakh river basins).
Ключевые слова:	U–; zircon; Siberian Craton; Kholomolokh; Ebelyakh placers; diamond; Pb dating;
Издано:	2021
Физ. характеристика:	с.48-52