Magma genesis and mantle heterogeneity in the Manus back-arc basin, Papua New Guinea

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doi: 10.1093/petrology/44.1.159
Authors:Sinton, John M.; Ford, Lori L.; Chappell, Bruce; McCulloch, Malcolm T.
Author Affiliations:Primary:
University of Hawaii, Department of Geology and Geophysics, Honolulu, HI, United States
Australian National University, Australia
Volume Title:Journal of Petrology
Source:Journal of Petrology, 44(1), p.159-195. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2003
Note:In English. 83 refs.; illus., incl. 10 tables, sketch maps
Summary:Back-arc volcanism is of five magma types, defined geochemically: medium-K lavas, back-arc basin basalts (BABB), extreme BABB, MORB and T-MORB. Manus MORB is even more depleted in HFSE than normal MORB. There are systematic, coupled relationships between the degree of mantle melting, prior depletion of the mantle source and enrichment in subduction-related components. Closest to the arc the most subduction-related components have been added to the mantle with the most prior depletion. Variations in K2O/H2O show the subduction-related component was phlogopite and or K-amphibole-bearing hybridized peridotite. Chemical and Sr, Nd and Pb isotope data for glasses and lavas of the above five types are listed. [B.E.L.]
Subsections:Igneous rocks
Subjects:Back-arc basins; Basalts; Basins; Genesis; Heterogeneity; Igneous rocks; Magmas; Mantle; Metasomatism; Mid-ocean ridge basalts; Peridotites; Plutonic rocks; Rift zones; Sea-floor spreading; Ultramafics; Volcanic rocks; Australasia; Bismarck Sea; Manus Basin; Pacific Ocean; Papua New Guinea; South Pacific; Southwest Pacific; West Pacific
Coordinates:S040000 S030000 E1520000 E1500000
Abstract Numbers:03M/1710
Record ID:2003025222
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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