Mantle metasomatism above subduction zones: Trace-element and radiogenic isotope characteristics of peridotite xenoliths from Batan Island (Philippines)

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1989)017<1115:MMASZT>2.3.CO;2· OSTI ID:6918437

Vidal, Ph ^[1]; Dupuy, C ^[2]; Maury, R; Richard, M ^[3]

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1. CNRS et Universite Blaise Pascal, Clermont-Ferrand (France)
2. CNRS, Montpellier (France)
3. Universite de Bretagne occidentale et G.S., Brest (France)

Trace-element abundances and radiogenic isotope ratios have been determined for a suite of upper mantle-derived xenoliths collected from Pliocene-Quaternary andesitic lavas on Batan Island, northernmost Philippines. The xenoliths exhibit mineralogical changes and large ion lithophile enrichment indicative of metasomatism involving H{sub 2}O-rich fluids. Strontium and neodymium isotopes in the xenoliths are not totally consistent with those in host lavas, but a common signature is indicated by the fact that all samples plot below the mantle array. The flux of fluids in the mantle wedge probably occurred over a long period of time. The flux induced large but variable changes in mineral and trace and isotopic compositions, and ultimately resulted in the melting of the peridotites and production of island-arc lavas.

• OSTI ID: 6918437
• Journal Information: Geology; (USA), Vol. 17:12; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
PHILIPPINES
VOLCANIC REGIONS
GEOCHEMISTRY
CALCIUM OXIDES
EARTH MANTLE
GEOLOGIC HISTORY
ISLANDS
ISOTOPE RATIO
LAVA
LEAD
MELTING
METAMORPHISM
MINERALOGY
MINERALS
NEODYMIUM
PERIDOTITES
PLIOCENE EPOCH
POTASSIUM OXIDES
QUATERNARY PERIOD
RESERVOIR FLUIDS
RUBIDIUM
SAMARIUM
STRONTIUM
TRACE AMOUNTS
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ASIA
CALCIUM COMPOUNDS
CENOZOIC ERA
CHALCOGENIDES
CHEMISTRY
DEVELOPING COUNTRIES
ELEMENTS
FLUIDS
GEOLOGIC AGES
IGNEOUS ROCKS
METALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
POTASSIUM COMPOUNDS
RARE EARTHS
ROCKS
TERTIARY PERIOD
580000* - Geosciences