Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Geochemical response to varying tectonic settings: An example from southern Sulawesi (Indonesia).
Author: Elburg, M.
Foden, J.
Citation: Geochimica et Cosmochimica Acta, 1999; 63(7-8):1155-1172
Issue Date: 1999
ISSN: 0016-7037
Abstract: The South arm of Sulawesi was an active continental margin from approximately 60 to 10 Ma, when it collided with the microcontinental fragment of Buton. Pre-collisional samples analyzed for this study are characterized by a geochemical signature typical of arc volcanics: high LILE/HFSE ratios; ⁸⁷Sr/⁸⁶Sr slightly higher than MORB; ¹⁴³Nd/¹⁴⁴Nd ratios similar to MORB. Syn-collisional samples have more enriched isotopic signatures, and are relatively potassium rich. This is interpreted to reflect a larger contribution from subducted sediments, added to the mantle wedge as a silicic melt. Melting of subducted sediments is interpreted to result from a decrease in subduction rate and an increase of temperature in the slab. Magmatism that postdates the collisional event by 10 Ma is characterized by higher Nb/Y ratios than the pre- or syn-collisional samples, and Sr and Nd isotopic signatures intermediate between these two groups. This is likely to reflect melting of a subduction-modified mantle, with a significant contribution from the sub-continental lithospheric mantle. Comparison with post-collisional magmatism from other areas of the world suggests that trace element signatures are similar, but isotopic characteristics are variable. The latter are likely to reflect both the age of the sub-continental lithospheric mantle and the time lag between cessation of subduction and formation of the post-collisional magmas.
Description: Copyright © 1999 Elsevier Science Ltd. All rights reserved.
DOI: 10.1016/S0016-7037(98)00298-1
Description (link):
Published version:
Appears in Collections:Aurora harvest 7
Geology & Geophysics publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.