m.y,-long magmatic activity in Sumatra (Indonesia)'from Paleocene to Present

BELLON, Herve and MAURY, Rene and SUTANTO, Sutanto and COTTEN, Joseph (2004) m.y,-long magmatic activity in Sumatra (Indonesia)'from Paleocene to Present. Buletin. Socal. geologie. France, 175 (1). pp. 61-72.

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Abstract. - Swn tra is th€ largest volcanic islatrd of the Indonesian archipelago. The oblique subduction of the lndian Ocean lithosphere below the Sundaland margin is responsible for the developmedt of a NW-SE trending volcanic arc, the location ofwhich coitrcides approxirnately with the Great Sumatratr Fault Zotre (CSFZ)- We preseat io this paper ca. 80 ne* onK-ooAt ages measured-on Cenozoic calc-alkaline to shoshonitic magmatic rocks sampled all along this arc ftorB Ac€h to Lampung. The results show that magmatic activity started duriog the Paleocene (ca. 63 Ma) all along rhe arc, aad was more or less permalrent urtil Present. However, its spatiel distribution increased at ca. 20 M8, a featwe po6- sibly connected to the development of the Gr€at Surnatran Fault. The position of Plio-Quatemary magmatic rocks is shifted away from the tencb by a few tens of kilometres with rcspect to that of P.leocene to Miocene on€s, a feailue consiste[t with a sigBificant tectotric erosiotr of the Sundaland margia during the Celozoic' The studigd samples display opical subduction-related geochemical riglratures. However, w€ have been utrable to idefiiry cleai geocheDrical trends, either spatial or temporal. We sugg€st that the lack ofsuch regular variations teflects a complex igneous petrogenesis during which

Item Type: Article
Subjects: Q Science > QE Geology
Divisions: Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User: sutanto sutanto -
Date Deposited: 09 Aug 2017 07:34
Last Modified: 18 Aug 2017 05:50
URI: http://eprints.upnyk.ac.id/id/eprint/12362

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