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Contact Aureole Kinetics and Intrusion Mechanics of the Torres del Paine Intrusion, Chile

English title Contact Aureole Kinetics and Intrusion Mechanics of the Torres del Paine Intrusion, Chile
Applicant Baumgartner Lukas P.
Number 105421
Funding scheme Project funding (Div. I-III)
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochemistry
Start/End 01.10.2004 - 31.03.2008
Approved amount 186'714.00
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Keywords (8)

Contact Metamorphism; Crystal Growth; Intrusion Mechanics; emplacement mechanics; laccolith; U-Pb dating; kinetics; geochemistry

Lay Summary (English)

Lay summary
The Torres del Paine Complex belongs to a series subvolcanic and plutonic igneous bodies of mostly calc-alkaline to alkaline composition, which form a line of Miocene magmatic activity in Patagonia (southern Chile and Argentina). This trench-parallel belt is located in transitional position between the Patagonia Batholith in the east and the Cenozoic plateau lavas in the west. It has been suggested that the emplacement of plutons in this distinctive position during the Miocene might be related to the subduction of the Chile Ridge at these latitudes in Miocene to recent times (Michael 1991; Welkner et al. 2002). The magmatic evolution of these plutonic complexes is of special interest because the Miocene is a time of major late tectonic changes in South America (Cande & Leslie 1986; Tebbens et al. 1997).
The 12.60 to 12.5 ± 0.02 Ma old Torres del Paine intrusive complex (TPIC) is a composite mafic-granitic intrusion, which forms a calc-alkaline suite, ranging from gabbros through diorites to leucogranites. The intrusive body consists of a basal mafic part and a beautifully exposed granitic laccolith. It intruded into sedimentary sequences of Cetaceous age and created a small contact-aureole. Our study of the TPIC has yielded so far highly precise age dates, confirmed that most mafic intrusives pre-date the granites, and that the granitic intrusion was emplaced by at least two pulses, which each one of them intruded in a period of less than 20’000 years. Detailed 3-D sampling will be obtained this coming January (2007). The data will be used to constrain models of magma emplacement in the shallow crust, and to investigate the reaction kinetics in the surrounding contact metamorphic rocks.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
120120 Contact Aureole Kinetics and Intrusion Mechanics of the Torres del Paine Intrusion, Chile 01.02.2009 Project funding (Div. I-III)
140974 Contact aureole kinetics and intrusion mechanism of the Torres del Paine intrusion, Chile 01.04.2012 Project funding (Div. I-III)