Mechanism of deep-seated magmatic activity below island-arc volcanoes and similar structures

Journal Article · Wed Jun 01 04:00:00 EDT 1977 · Int. Geol. Rev.; (United States)

DOI:https://doi.org/10.1080/00206817709471064· OSTI ID:7054946

Fedotov, S A

Geophysical data on deep-seated magmatic activity below Eastern Kamchatka and the mechanism of uprise of magmas were analyzed, and phenomena associated with the uprise of magmas through hydrostatic forces were investigated. Ultrabasic magmatic columns must rise from a local layer at depths of 100 to 250 km. Above it in the asthenosphere, a regular series of major magmatic columns develops with a spacing of about 30 km, which provides separate individual volcanic centers. The optimal radius of the columns is 350 to 1000 m and the velocity of their uprise is about 1 m/yr. Magma is moved in them by an order more rapidly than in the asthenoliths. Excess magmatic pressure in the columns contributes to the formation of accumulations of ultrabasic and basic magmas near the base, the crust and the transitional layer between the crust and the mantle, and also to the development of peripheral andesitic magmatic foci on the boundary between the crystalline basement and the sediments. A probable scheme for deep-seated magmatic activity below the volcanic belt of Eastern Kamchatka, the island arcs and similar structures is presented.

• OSTI ID: 7054946
• Journal Information: Int. Geol. Rev.; (United States), Journal Name: Int. Geol. Rev.; (United States) Vol. 19:6; ISSN IGREA
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152000 -- Geothermal Data & Theory
58 GEOSCIENCES
580202* -- Geophysics-- Volcanology-- (1980-1989)
DEPTH
DIMENSIONS
EARTH CRUST
EARTH MANTLE
EUROPE
FLUID FLOW
IGNEOUS ROCKS
INTRUSION
MAGMA
PRESSURE DEPENDENCE
ROCKS
USSR
VOLCANIC REGIONS
VOLCANISM