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Limited influence of subducted continental material on mineralogy and elemental geochemistry of primitive magmas from Indonesia-Australia collision zone
Citation
Elburg, MA and Kamenetsky, VS, Limited influence of subducted continental material on mineralogy and elemental geochemistry of primitive magmas from Indonesia-Australia collision zone, Lithos, 105, (1) pp. 73-84. ISSN 0024-4937 (2008) [Refereed Article]
DOI: doi:10.1016/j.lithos.2008.02.010
Abstract
Melt inclusions within forsterite-rich olivine crystals in two mixed magmas from the Indonesia-Australia collision zone provide information on the primary melts formed within this tectonic environment. Although whole rock Sr, Nd and Pb isotope data show a strong influence of subducted continental material, the melt inclusion major and trace element compositions are only subtly different from typical subduction-related magmas. The presence of low-Ca olivine crystals with inclusions of aluminous spinel in one sample can be explained by localised reactions during influx of hot basaltic magma in a partially crystallised magma chamber. The mineralogy of the samples is similar to that of other mixed arc magmas. Major and trace element data for reheated melt inclusions show subtle distinctions compared to non-collisional magmas in terms of CaO/Al2O3, Th/Nb and Sr/Y ratios, reflecting partial melting processes during slab to wedge transfer of subducted continental material. Magmas influenced by the subduction of continental material are therefore very similar to normal subduction-related magmas, apart from their radiogenic isotope signature. Magmas with crustal isotope ratios and highly unusual (e.g. peraluminous) geochemical compositions must therefore be formed by other processes, such as upper crustal contamination. © 2008 Elsevier B.V. All rights reserved.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Geochemistry |
Research Field: | Exploration geochemistry |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Kamenetsky, VS (Professor Vadim Kamenetsky) |
ID Code: | 56535 |
Year Published: | 2008 |
Web of Science® Times Cited: | 4 |
Deposited By: | Centre for Ore Deposit Research - CODES CoE |
Deposited On: | 2009-05-09 |
Last Modified: | 2009-05-21 |
Downloads: | 0 |
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