Accumulative Landforms in Valleys with Gas-Hydrothermal Occurrences (from the Example of Watercourses of Some Volcanic Massifs in the Kuril—Kamchatka Region)

Lebedeva, E.V.; Zharkov, R.V.

Авторы: Lebedeva E.V., Zharkov R.V.
Журнал: Doklady Earth Sciences
Том: 506
Номер: 3
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 7
Последняя страница: 18
DOI: 10.1134/s1028334x22700131
Аннотация: The formation of relief is accompanied by chemical and thermal effects within the stream valleys of geothermal zones, where manifestations of gas-hydrothermal activity are noted. It has been established that, in the valleys of the rivers considered, specific accumulative forms of micro- and mesorelief are formed both in the channels and on the slopes. The secondary treatment of alluvial deposits and bedrock by the hydrothermal solutions leads to a dramatic change in their properties and the features of fluvial processes. Activation of slope processes with the formation of landslide bodies and rockslide masses lead to the accumulationof slope material in the bottom, which is subsequently redeposited by mudflows. The forms of accumulative relief, which formed due to the gas-hydrothermal activity, were typified for the river valleys of fourvolcanic massifs on the Kuril Islands (Mendeleev volcano on Kunashir Island, Baranskii volcano on Iturup Island) and Kamchatka (Mutnovskii volcano and the Uzon-Geysernaya caldera). The main forms of accumulative micro- and mesorelief associated with various manifestations of gas-hydrothermal activity are distinguished;their characteristics are given, and the morphometric parameters are described. Typical processes in the valleys of geothermal zones involve not only the formation of various sinter forms and the cementationof floodplain and terrace deposits in places where mineralized thermal springs erupt, but also the formation of rather large landslide pseudo-terraces and the blocking of watercourses with dams composed of slope andmudflow material. Active weathering of bedrock and boulder–pebble material to clays can also be affected by acidic solutions. Often, sediments that compose floodplains and terraces morphologically look like typicalpebble alluvium; however, they are actually a clay mass that is easily washed away by surface waters. With the attenuation of gas-hydrothermal activity, landslide bodies and sinter forms overgrow and morphologicallylook like ordinary river terraces.
Добавил в систему: Лебедева Екатерина Владимировна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ЦЭМИ РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ЦЭМИ РАН

Accumulative Landforms in Valleys with Gas-Hydrothermal Occurrences (from the Example of Watercourses of Some Volcanic Massifs in the Kuril—Kamchatka Region)статья

Прикрепленные файлы