Journal article
Temporal variation of isotope and rare earth element abundances in volcanic rocks from Guam; implications for the evolution of the Mariana Arc
Contributions to mineralogy and petrology, Vol.97(4), pp.497-508
1987
DOI: 10.1007/BF00375327
Abstract
Volcanic rocks exposed on Guam were erupted during the late Middle Miocene (Facpi formation), late Eocene-Oligocene (Alutom formation) and Miocene (Umatac formation). Four magma series are recognized: the boninite series (44 m.y. B.P.); the tholeiite and calc-alkaline series, which were erupted along with the boninite series lavas at 32-36 m.y. B.P.; and the high-K lavas of the Umatac formation (14 m.y. B.P.). Isotope and REE characteristics of the four magma series are distinct. Details are presented. Boninite and tholeiite series magmas, erupted in the position of the Palau- Kyushu Ridge, were probably derived from distinct mantle sources having OIB and N-MORB-like isotopic characteristics, together with fluids derived from subducted Pacific plate basalt. Calc-alkaline series lavas were most likely derived from the tholeiite series by crystal fractionation, wallrock contamination and magma mixing. Lavas of the Umatac formation, erupted in the position of the West Mariana Ridge, may include up to 2-3% subducted sediment, similar to some active Mariana arc lavas.
Details
- Title: Subtitle
- Temporal variation of isotope and rare earth element abundances in volcanic rocks from Guam; implications for the evolution of the Mariana Arc
- Creators
- Rosemary Hickey-Vargas - Florida International UniversityM. K Reagan - University of California, Santa Cruz
- Resource Type
- Journal article
- Publication Details
- Contributions to mineralogy and petrology, Vol.97(4), pp.497-508
- Publisher
- Springer International
- DOI
- 10.1007/BF00375327
- ISSN
- 0010-7999
- eISSN
- 1432-0967
- Language
- English
- Date published
- 1987
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229172102771
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