from 01.01.2021 until now
Vidnoe, Moscow, Russian Federation
Moscow, Russian Federation
Institut geohimii i analiticheskoy himii imeni V.I. Vernadskogo RAN
Geologicheskiy institut RAN
UDK 551.83 Палеогеография палеозоя
UDK 550.422 Распространенность отдельных химических элементов на Земле (земная кора, ядро Земли и т. д.)
UDK 550.428 Парагенетические ассоциации химических элементов
UDK 550.462 Геохимическое действие атмосферы
UDK 55 Геология. Геологические и геофизические науки
UDK 550.34 Сейсмология
UDK 550.383 Главное магнитное поле Земли
GRNTI 37.01 Общие вопросы геофизики
GRNTI 37.15 Геомагнетизм и высокие слои атмосферы
GRNTI 37.25 Океанология
GRNTI 37.31 Физика Земли
GRNTI 38.01 Общие вопросы геологии
GRNTI 36.00 ГЕОДЕЗИЯ. КАРТОГРАФИЯ
GRNTI 37.00 ГЕОФИЗИКА
GRNTI 38.00 ГЕОЛОГИЯ
GRNTI 39.00 ГЕОГРАФИЯ
GRNTI 52.00 ГОРНОЕ ДЕЛО
OKSO 05.00.00 Науки о Земле
BBK 26 Науки о Земле
TBK 63 Науки о Земле. Экология
BISAC SCI SCIENCE
The features of the mineral and chemical composition (major elements) of the Vendian-Cambrian rocks of the Silimkun Formation (V-Є1sl), exposed on the western side of the Upper Kalar graben syncline in the southwest of the Aldan shield, are considered. The studied rocks – sandstones and siltstones, belong to arkoses and subarkoses. According to their chemotype, they correspond normosilites and myosilites. In terms of the alkaline modulus, the studied silites are hyperpotassium and serve as a fairly striking example of the products of Precambrian arid weathering. The standard mineral composition, its variations, the validity of calculations based on petrographic research data, the problems of using climate indices and lithochemical diagrams aimed at reconstructing climatic changes in the geological past are discussed. Chemical Index of Alteration (CIA) index values range from 49, which corresponds to a virtually unchanged rock, to 67. The average is about 58. Minor changes in the index value for this sample are associated primarily with variations in the content of illite cement and muscovite. Robust Weathering index (RW) values range from 37 to 68 (with an average of about 57).
Ediacaran, Cambrian, Udokan region, climate, chemical weathering proxies
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