Crystal Accumulation and Magma Mixing in the Petrogenesis of Tholeiitic Andesites from Fukujin Seamount, Northern Mariana Island Arc

Fukujin Seamount is a large, active, submarine volcano on the volcanic front in the northern seamount province (NSP) of the Mariana island arc (MIA). Five dredge hauls from the summit and upper flanks of Fukujin recovered mainly highly porphyritic basaltic andesites. A few nearly aphyric samples are...

Full description

Saved in:
Bibliographic Details
Published in:Journal of petrology 1993-04, Vol.34 (2), p.259-289
Main Author: JACKSON, M.C
Format: Article
Language:English
Subjects:
Crystalline rocks
Earth sciences
Earth, ocean, space
Exact sciences and technology
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Marine
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Fukujin Seamount is a large, active, submarine volcano on the volcanic front in the northern seamount province (NSP) of the Mariana island arc (MIA). Five dredge hauls from the summit and upper flanks of Fukujin recovered mainly highly porphyritic basaltic andesites. A few nearly aphyric samples are medium-K siliceous andesites (SiO2 = 62%, K2O = 1â‹…5%). Fukujin and most other large arc-front volcanoes of the northern MIA have tholeiitic (iron-enrichment) fractionation trends. This contrasts with the calc-alkaline trends of many smaller seamounts. A negative correlation of modal plagioclase content with bulk-rock SiO2, as well as bulk-rock major and trace element variation trends, and glass analyses, suggests that lavas with >30 vol.% phenocrysts and
ISSN:0022-3530
1460-2415
DOI:10.1093/petrology/34.2.259