Статья опубликована в журнале из списка RSCI Web of Science
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
Аннотация:A mantle plume is a rising stream of vigorous thermal convection, which takes a mushroom-
like shape and has a nite lifetime. When the plume approaches to the lithosphere the
plume head rst penetrates it. During the solidication of magma near the plume head a
large igneous province (LIP) is formed. Later the plume tail penetrates the moving plate
and forms a chain of volcanoes oriented in the direction of plate motion. A hot spot (HS)
is the end location of the chain or the place of modern penetration of the plume tail in the
form of an active volcano. In existing numerical models of mantle convection the plume
tails are continuous streams. The question of why between the volcanic islands there is
an interval of several hundred km (which corresponds to the interval between eruptions of
several million years) is discussed starting from the time of emergence of the concept of
plumes. This work on the numerical models shows that a primary plume originates only at
the mantle bottom and dies not by attenuation but by pairwise association of two adjacent
plumes. Also the work studies the internal structure of mantle plumes. It is shown that
the plume tail is a pulsating jet already in the lower mantle with periods of several million years. When the plume encounters the 660 km phase boundary it attens out against this surface and transforms into secondary more frequent plumes in the form of the individual thermals (heads detached from tails). KEYWORDS: Convection; plumes; pulsations; volcanic chains.