Shoshonitic magmas in nascent arcs; new evidence from submarine volcanoes in the Northern Marianas

Volcanoes in the northern Mariana arc between Uracas (lat 20°N) and Minami Iwo Jima (24°N) are very active yet entirely submarine. In contrast to the predominantly low-K basaltic magmas of the central Mariana arc, the northern Mariana arc is dominated by more siliceous melts in the south and by shos...

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Bibliographic Details
Published in:Geology (Boulder) 1988-05, Vol.16 (5), p.426-430
Main Authors: Stern, Robert J, Bloomer, Sherman H, Lin, Ping-Nan, Ito, Emi, Morris, Julie
Format: Article
Language:English
Subjects:
basalts
evolution
geochemistry
Geophysics
igneous and metamorphic rocks
igneous rocks
island arcs
lava
magmas
major elements
Mariana Islands
marine environment
Micronesia
North Pacific
Northern Mariana Islands
Northwest Pacific
Oceania
Pacific Ocean
petrology
rock, sediment, soil
shoshonite
solid Earth (tectonophysics)
spreading centers
submarine environment
trace elements
volcanic rocks
volcanoes
volcanology
West Pacific
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Summary:Volcanoes in the northern Mariana arc between Uracas (lat 20°N) and Minami Iwo Jima (24°N) are very active yet entirely submarine. In contrast to the predominantly low-K basaltic magmas of the central Mariana arc, the northern Mariana arc is dominated by more siliceous melts in the south and by shoshonites in the north. The northern arc melts have enrichments in Ba (
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(1988)016<0426:SMINAN>2.3.CO;2