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Oceanic intraplate volcanoes exposed: example from seamounts accreted in Panama

Buchs, David, Arculus, Richard J., Baumgartner, Peter O. and Ulianov, Alexey 2011. Oceanic intraplate volcanoes exposed: example from seamounts accreted in Panama. Geology 39 (4) , pp. 335-338. 10.1130/G31703.1

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Abstract

Two Paleogene ocean islands are exposed in the Azuero Peninsula, west Panama, within sequences accreted in the early-Middle Eocene. A multidisciplinary approach involving lithologic mapping, paleontological age determinations, and petrological study allows reconstruction of the stratigraphy and magmatic evolution of one of these intraplate oceanic volcanoes. From base to top, the volcano's structure comprises submarine basaltic lava flows locally interlayered with hemipelagic sediments, basaltic breccias, shallow-water limestones, and subaerial basaltic lava. Gabbros and basaltic dikes were emplaced along a rift zone of the island. Geochemical trends of basaltic lavas include decreased Mg# {[Mg/(Mg + Fe)] * 100} and, with time, increased incompatible element contents thought to be representative of many poorly documented intraplate volcanoes in the Pacific. Our results show that, in addition to deep drilling, the roots of oceanic islands can be explored through studies of accreted and subaerially exhumed oceanic sequences.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 04 Jun 2017 04:46
URI: http://orca-mwe.cf.ac.uk/id/eprint/44366

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