Incremental growth of the Patagonian Torres del Paine laccolith over 90 k.y.

Détails

ID Serval
serval:BIB_85E7AAD17A1D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Incremental growth of the Patagonian Torres del Paine laccolith over 90 k.y.
Périodique
Geology
Auteur⸱e⸱s
Michel J., Baumgartner L.P., Putlitz B., Schaltegger U., Ovtcharova M.
ISSN-L
0016-8505
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
36
Pages
459-462
Langue
anglais
Notes
ISI:000256389500007
Résumé
The Miocene Paine Granite in the Torres del Paine Intrusive Complex,
southern Chile, is an extraordinary example of an upper crustal mafic
and granitic intrusion. The granite intruded as a series of three
sheets, each one underplating the previous sheet along the top of the
basal Paine Mafic Complex. High-precision U/Pb geochronology on single
zircons using isotope dilution-thermal ionization mass spectrometry
yields distinct ages of 12.59 +/- 0.02 Ma and 12.50 +/- 0.02 Ma,
respectively, for the first and last sheet of the laccolith. This age
relationship is consistent with field observations. The zircon ages
define a time frame of 90 +/- 40 k.y. for the emplacement of a
>2000-m-thick granite laccollith. These precise U-Pb zircon ages permit
identification of the pulses in a 20 k.y. range. The data obtained for
the Paine Granite fill the gap between 100 k.y. and 100-1000 yr pulses
described in the literature for crustal magma chambers.
Création de la notice
24/09/2012 19:08
Dernière modification de la notice
20/08/2019 14:45
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