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The age of undeformed dacite intrusions within the Kolaka Fault zone, SE Sulawesi, Indonesia

White, Lloyd; Hall, Robert; Armstrong, Richard

Description

We present petrologic, geochemical and U-Pb sensitive high resolution ion microprobe (SHRIMP) data from previously undocumented dacite intrusions from the SE Arm of Sulawesi. The dacites occur in a strand of a major fault (the Kolaka Fault) that crosses the SE Arm of Sulawesi and northern Bone Bay. U-Pb SHRIMP dating shows the "Kolaka Dacite" yields zircon grains and overgrowths that range between ca. 4 and 7. Ma, indicating active magmatism in SE Sulawesi at this time. The youngest age...[Show more]

dc.contributor.authorWhite, Lloyd
dc.contributor.authorHall, Robert
dc.contributor.authorArmstrong, Richard
dc.date.accessioned2015-12-13T22:32:08Z
dc.identifier.issn1367-9120
dc.identifier.urihttp://hdl.handle.net/1885/75439
dc.description.abstractWe present petrologic, geochemical and U-Pb sensitive high resolution ion microprobe (SHRIMP) data from previously undocumented dacite intrusions from the SE Arm of Sulawesi. The dacites occur in a strand of a major fault (the Kolaka Fault) that crosses the SE Arm of Sulawesi and northern Bone Bay. U-Pb SHRIMP dating shows the "Kolaka Dacite" yields zircon grains and overgrowths that range between ca. 4 and 7. Ma, indicating active magmatism in SE Sulawesi at this time. The youngest age population (4.4. ±. 0.2. Ma) from this range is interpreted to be the maximum crystallization age for the dacite. The Kolaka Dacite is undeformed, and so potentially intruded during or after movement within a strand of the Kolaka Fault. The dacites may have otherwise been emplaced passively along existing foliation planes in the country rock schist. Additional U-Pb data were collected from inherited zircons, yielding ages between 8. Ma and 1854. Ma. We consider that these inherited zircons are xenocrysts, derived from either (1) a partially melted protolith and/or (2) xenocrysts assimilated during ascent of the magma. In either case, the inherited zircons record the age of the basement rocks beneath this part of SE Sulawesi. These inherited zircon cores show that the SE arm of Sulawesi is underlain by Proterozoic or younger material, validating earlier ideas that the crust here was derived from Gondwana.
dc.publisherPergamon-Elsevier Ltd
dc.sourceJournal of Asian Earth Sciences
dc.titleThe age of undeformed dacite intrusions within the Kolaka Fault zone, SE Sulawesi, Indonesia
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume94
dc.date.issued2014
local.identifier.absfor040313 - Tectonics
local.identifier.absfor040303 - Geochronology
local.identifier.ariespublicationU3488905xPUB4619
local.type.statusPublished Version
local.contributor.affiliationWhite, Lloyd, Royal Holloway, University of London
local.contributor.affiliationHall, Robert, University of London
local.contributor.affiliationArmstrong, Richard, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage105
local.bibliographicCitation.lastpage112
local.identifier.doi10.1016/j.jseaes.2014.08.014
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2015-12-11T09:04:57Z
local.identifier.scopusID2-s2.0-84907164100
CollectionsANU Research Publications

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