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U-series Isotope Data on Lau Basin Glasses: the Role of Subduction-related Fluids during Melt Generation in Back-arc Basins |
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| Authors: | PEATE DAVID W; KOKFELT THOMAS F; HAWKESWORTH CHRIS J; VAN CALSTEREN PETER W; HERGT JANET M; PEARCE JULIAN A |
| Institution: | 1DEPARTMENT OF EARTH SCIENCES, THE OPEN UNIVERSITY, WALTON HALL, MILTON KEYNES MK7 6AA, UK 2SCHOOL OF EARTH SCIENCES, THE UNIVERSITY OF MELBOURNE, MELBOURNE, VIC. 3010, AUSTRALIA 3DEPARTMENT OF EARTH SCIENCES, CARDIFF UNIVERSITY, MAIN COLLEGE, PARK PLACE, P.O. BOX 914, CARDIFF CF1 3YE, UK |
| Abstract: | New thermal ionization mass spectrometry U-series disequilibriumdata are presented for 24 basaltic to dacitic glasses from activespreading centres in the back-arc Lau Basin (SW Pacific), togetherwith additional inductively coupled plasma mass spectrometrytrace element analyses and Sr–Nd–Pb isotope data.Valu Fa Ridge samples, adjacent to the arc front, have highU/Th and (230Th/238U) <1, implying a recent (<<350ka) addition of a U-rich slab-derived fluid. The Valu Fa datacan be combined with existing 230Th–238U data for theCentral Tonga arc to infer a fluid addition event at |
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