Geodynamics of late carboniferous–early Permian forearc in north Chile (28°30′–29°30′S)

C. Creixell, V. Oliveros, P. Vásquez, J. Navarro, D. Vallejos, X. Valin, E. Godoy, Mihai N Ducea

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A large section of the Late Palaeozoic forearc is exposed along the coastal ranges of north–central Chile (28°–29° 30′S). This is characterized by three lithotectonic units: (1) the Punta de Choros Metamorphic Complex (basal accretion series), composed mostly of micaschists and metabasites; (2) the Chañaral Epimetamorphic Complex (frontal accretion series), formed by metaturbidites and metasediments; (3) the Llano del Chocolate Beds (forearc basin deposits), composed of a sedimentary sequence of clastic sedimentary rocks with minor limestones and acidic volcanic rocks. Within the basal accretion series, two distinctive blocks of garnet-bearing schists with amphibolite-facies metamorphism have been preserved, recording early stages of the subduction system. The stratigraphic record and the U–Pb dating of igneous (291–318 Ma) and detrital zircons (maximal deposition ages between 273 and 292 Ma) in the forearc basin deposits, coupled with40Ar/39Ar ages for metamorphic rocks (319–280 Ma), indicate that forearc sedimentation was broadly contemporaneous with metamorphism and exhumation of the basal accretion series. The radiometric dating on garnet-bearing rocks indicates that the onset of the subduction system took place in the Mississippian, at a high thermal gradient. These conditions were responsible for generation of limited volumes of acidic melt, now recognized as acidic domes and tuffs within the forearc basin stratigraphy.

Original languageEnglish (US)
Pages (from-to)757-772
Number of pages16
JournalJournal of the Geological Society
Volume173
Issue number5
DOIs
StatePublished - Sep 1 2016

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geodynamics
forearc basin
Permian
accretion
garnet
metamorphism
subduction
metabasite
clastic rock
geological record
metasediment
sedimentary sequence
amphibolite facies
exhumation
metamorphic rock
schist
dome
sedimentary rock
volcanic rock
zircon

ASJC Scopus subject areas

  • Geology

Cite this

Geodynamics of late carboniferous–early Permian forearc in north Chile (28°30′–29°30′S). / Creixell, C.; Oliveros, V.; Vásquez, P.; Navarro, J.; Vallejos, D.; Valin, X.; Godoy, E.; Ducea, Mihai N.

In: Journal of the Geological Society, Vol. 173, No. 5, 01.09.2016, p. 757-772.

Research output: Contribution to journalArticle

Creixell, C, Oliveros, V, Vásquez, P, Navarro, J, Vallejos, D, Valin, X, Godoy, E & Ducea, MN 2016, 'Geodynamics of late carboniferous–early Permian forearc in north Chile (28°30′–29°30′S)', Journal of the Geological Society, vol. 173, no. 5, pp. 757-772. https://doi.org/10.1144/jgs2016-010
Creixell, C. ; Oliveros, V. ; Vásquez, P. ; Navarro, J. ; Vallejos, D. ; Valin, X. ; Godoy, E. ; Ducea, Mihai N. / Geodynamics of late carboniferous–early Permian forearc in north Chile (28°30′–29°30′S). In: Journal of the Geological Society. 2016 ; Vol. 173, No. 5. pp. 757-772.
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