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Scientific Article
unige:21547 
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Incremental growth of the Patagonian Torres del Paine laccolith over 90 k.y |
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| Published in | Geology. 2008, vol. 36, no. 6, p. 459 | |
| 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 | |
| Identifiers | DOI: 10.1130/G24546A.1 | |
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| Research group | Isotope Geochemistry, Geochronology and Thermochronology | |
| 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. https://archive-ouverte.unige.ch/unige:21547 |
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