Boron-isotope systematics of Halmahera Arc (Indonesia) lavas; evidence for involvement of the subducted slab

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doi: 10.1130/0091-7613(1991)019<0215:BISOHA>2.3.CO;2
Authors:Palmer, M. R.
Author Affiliations:Primary:
Mass. Inst. Technol., Dep. Earth, Atmos. and Planet. Sci., Cambridge, MA, United States
Volume Title:Geology (Boulder)
Source:Geology (Boulder), 19(3), p.215-217. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613
Publication Date:1991
Note:In English. 22 refs.; illus. incl. 1 table
Summary:Dehydration of sediments and oceanic crust within the subducting slab at convergent plate margins is probably a ubiquitous feature. This leads to fractionation of elements between fluids and solids so that the slab-derived component of island-arc lavas is modified from the originally subducted material. Sediments and altered oceanic crust are enriched in boron and cesium relative to uncontaminated mantle products, and these elements are highly mobile during fluid-rock interaction. The combination of B-isotope systematics and Cs concentrations in lavas from the Halmahera arc (Indonesia) suggests that they have been influenced by fluids derived from dehydration and/or melting of the subducted slab.
Subjects:Alkali metals; B-11/B-10; Boron; Cesium; Dehydration; Geochemistry; Halmyrolysis; Igneous rocks; Island arcs; Isotopes; Lava; Metals; Migration of elements; Plate convergence; Plate tectonics; Slabs; Stable isotopes; Tectonophysics; Trace elements; Volcanic rocks; Water-rock interaction; Asia; Far East; Indonesia; Halmahera
Coordinates:S013000 N020000 E1283000 E1270000
Abstract Numbers:91M/4483
Record ID:1991016913
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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