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Scientific article
English

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

Published inGeology, vol. 36, no. 6, 459
Publication date2008
Abstract

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.

Keywords
  • Granite
  • U/pb geochronology
  • Magma chambers
  • Laccolith
  • Emplacement rates
Citation (ISO format)
MICHEL, Jürgen et al. Incremental growth of the Patagonian Torres del Paine laccolith over 90 k.y. In: Geology, 2008, vol. 36, n° 6, p. 459. doi: 10.1130/G24546A.1
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ISSN of the journal0091-7613
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