Cryptotephra of Lake Khorlakel (Northern Caucasus, Russia)

Mazneva, E.A.; Aleksandrin, M.Yu.; Konstantinov, E.A.; Ponomareva, V.V.; Portnyagin, M.V.; Borisov, D.G.

doi:10.31951/2658-3518-2022-A-4-1497

Авторы

Mazneva, E.A. ¹
Aleksandrin, M.Yu. ¹
Konstantinov, E.A. ¹
Ponomareva, V.V. ²
Portnyagin, M.V. ³
Borisov, D.G. ⁴

¹

²

³

⁴

DOI:

https://doi.org/10.31951/2658-3518-2022-A-4-1497

Ключевые слова:

tephra, tephrochronology, cryptotephra, Lake Khorlakel, volcanic ash

Аннотация

A tephrochronological study of the core HOR-1 of bottom sediment from Lake Khorlakel, located 24 km northwest of the Elbrus summit, was carried out. The core was 253 cm length. Deposits are represented by interbedding of thin-layered loams and bio-mineral silt. Six intervals of increased content of cryptotephra from 37,000 to 111,000 shards g dry weight ⁻¹were identified. For a prominent peak of cryptotephra concentration in 214-215 cm, which is hardly noticeable as a whitish layer in the core, a geochemical relationship has been established with the proximal tephra of the Elbrus volcano. The age of this peak is estimated at 5950-6250 cal. yr BP.