Conference proceeding
Trace-Element Geochemistry of Volcanic Rocks from Site 786: The Izu-Bonin Forearc
Proceedings of the Ocean Drilling Program, Scientific Results,, Vol.125, pp.211-235
1992
DOI: 10.2973/odp.proc.sr.125.133.1992
Abstract
Eocene-Oligocene volcanic rocks drilled at Site 786 in the Izu-Bonin forearc cover a wide range of compositions from primitive boninites to highly evolved rhyolites. K-Ar dating reveals at least two distinct episodes of magmatism; one at 41 Ma and a later one at 35 Ma. The early episode produced low-Ca boninites and bronzite andesites that form an oceanic basement of pillow lavas and composite intrusive sheets, overlain by flows and intrusive sheets of intermediate-Ca boninites and bronzite-andesites and a fractionated series of andesites, dacites, and rhyolites. The later episode produced high-Ca boninites and intermediate-Ca boninites, exclusively as intrusive sheets.
Details
- Title: Subtitle
- Trace-Element Geochemistry of Volcanic Rocks from Site 786: The Izu-Bonin Forearc
- Creators
- Bramley J MurtonDavid W Peate - University of Iowa, Earth and Environmental SciencesRichard J ArculusJulian A PearceSieger van der Laan
- Resource Type
- Conference proceeding
- Publication Details
- Proceedings of the Ocean Drilling Program, Scientific Results,, Vol.125, pp.211-235
- DOI
- 10.2973/odp.proc.sr.125.133.1992
- ISSN
- 0884-5891
- Publisher
- Ocean Drilling Program
- Language
- English
- Date published
- 1992
- Academic Unit
- Earth and Environmental Sciences; Honors Program
- Record Identifier
- 9983984541802771
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