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Devonian magmatism in the accretionary complex of southern Chile

Hervé, F.; Calderon, M.; Fanning, C. M.; Pankhurst, R. J.; Fuentes, F.; Rapela, C. W.; Correa, J.; Quezada, P.; Marambio, C.

Description

Supposed or potential Devonian igneous rocks in the accretionary complex of southern Chile were investigated using sensitive high-resolution ion microprobe U–Pb dating of zircon, with Hf- and O-isotope analyses of selected grains. Ages of 384 ± 3 and 382 ± 2 Ma are confirmed for two igneous bodies (another having been previously dated at 397 ± 1 Ma). Detrital zircon ages in the host rocks, some associated with Devonian marine fossils, indicate maximum possible sedimentation ages of c. 330 –...[Show more]

dc.contributor.authorHervé, F.
dc.contributor.authorCalderon, M.
dc.contributor.authorFanning, C. M.
dc.contributor.authorPankhurst, R. J.
dc.contributor.authorFuentes, F.
dc.contributor.authorRapela, C. W.
dc.contributor.authorCorrea, J.
dc.contributor.authorQuezada, P.
dc.contributor.authorMarambio, C.
dc.date.accessioned2016-09-20T00:23:14Z
dc.date.available2016-09-20T00:23:14Z
dc.identifier.issn0016-7649
dc.identifier.urihttp://hdl.handle.net/1885/108917
dc.description.abstractSupposed or potential Devonian igneous rocks in the accretionary complex of southern Chile were investigated using sensitive high-resolution ion microprobe U–Pb dating of zircon, with Hf- and O-isotope analyses of selected grains. Ages of 384 ± 3 and 382 ± 2 Ma are confirmed for two igneous bodies (another having been previously dated at 397 ± 1 Ma). Detrital zircon ages in the host rocks, some associated with Devonian marine fossils, indicate maximum possible sedimentation ages of c. 330 – 385 Ma. Devonian ages of 391 ± 10 and 374 ± 3 Ma for plutonic rocks at the western edge of the North Patagonian Massif are somewhat older than those of orthogneisses in the western flank of the Andes near Chaitén (361 ± 7 and 364 ± 2 Ma). O and Hf isotopes indicate that the Devonian intrusions in the accretionary complex crystallized from mantle-derived magmas, whereas those in the North Patagonian Massif show a strong crustal influence, corresponding to oceanic and continental margin subduction environments of magma genesis, respectively. Devonian zircon provenance in the accretionary complex was from the North Patagonian Massif and not from the mantle-derived intrusions, suggesting that the accretionary complex formed an integral part of the Gondwana margin during Devonian–Carboniferous times.
dc.description.sponsorshipProject Fondecyt 1130227 financed the research.
dc.format16 pages
dc.publisherGeological Society
dc.rights© 2016 The Author(s). Published by The Geological Society of London.
dc.sourceJournal of the Geological Society
dc.subjectDevonian
dc.subjectigneous rocks
dc.subjectsouthern Chile
dc.subjecthigh-resolution ion
dc.subjectmicroprobe
dc.subjectU–Pb dating of zircon
dc.subjectmarine fossils
dc.subjectNorth Patagonian Massif
dc.subjectAndes
dc.subjectGondwana margin
dc.titleDevonian magmatism in the accretionary complex of southern Chile
dc.typeJournal article
local.identifier.citationvolume173
dcterms.dateAccepted2016-01-12
dc.date.issued2016-07
local.publisher.urlhttp://www.geolsoc.org.uk/
local.type.statusPublished Version
local.contributor.affiliationFanning, Christopher Mark, RSES General, CPMS Research School of Earth Sciences, The Australian National University
local.identifier.essn2041-479X
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage587
local.bibliographicCitation.lastpage602
local.identifier.doi10.1144/jgs2015-163
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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