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International Journal of Earth Sciences

, Volume 97, Issue 1, pp 71–88 | Cite as

Provenance of late Palaeozoic metasediments of the Patagonian proto-Pacific margin (southernmost Chile and Argentina)

  • Carita AugustssonEmail author
  • Heinrich Bahlburg
Original Paper

Abstract

In this provenance study of late Palaeozoic metasediments of the Eastern Andean Metamorphic Complex (EAMC) along the south Patagonian proto-Pacific margin of Gondwana, the palaeogeological setting of the continental margin in Devonian–Carboniferous and Permian times is reconstructed. The study is based on detrital heavy mineral contents, chemical compositions of tourmaline grains, and whole rock element and Nd-Sr isotopic compositions. Element and isotopic compositions reveal that Devonian–Carboniferous metaturbidites deposited before the development of a Late Carboniferous–Permian magmatic arc along the margin were mainly fed from felsic, recycled, old continental rocks. The last recycling phase involved erosion of metasediments that were exposed in Patagonia. Feeder systems to the basin cut either through epidote-rich or garnet-rich metasediments. In Permian time, EAMC metaturbidites were deposited next to the evolving magmatic arc and were derived from felsic, crustal rocks. Two provenance domains are recognised. The metasediments of the northern one are chemically similar to those of the Devonian–Carboniferous metasediments. This domain was fed from the metasedimentary host rocks of the magmatic arc. The southern domain probably was fed from the arc proper, as indicated mainly by the dominance of metaplutonic lithic fragments, abundant detrital biotite, and the major element composition of the metasediments.

Keywords

Provenance Geochemistry Heavy minerals Palaeozoic Patagonia 

Notes

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft (DFG; grants Ba 1011/17-1, -2 and -3). Juan-Pablo Lacassie and Nicole Dobrzinski are acknowledged for rock samples. Mukul Bhatia, Keith Crook, Hilmar von Eynatten and Arne Willner are thanked for valuable comments on earlier versions of the paper and Ralph O Howard Jr is acknowledged for checking the English grammar.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Geologisch-Paläontologisches Institut, Westfälische Wilhelms-UniversitätMuensterGermany
  2. 2.Zentrallaboratorium für Geochronologie, Mineralogisches InstitutWestfälische Wilhelms-UniversitätMuensterGermany

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