New 40Ar/39Ar dates from the Las Tazas complex,northern Chile: Tectonic significance |
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| Affiliation: | 1. Paleomagnetic Laboratory ‘Fort Hoofddijk’, Faculty of Geosciences, Utrecht University, Budapestlaan 17, Utrecht CD-3584, The Netherlands;2. CASP, West Building, 181a Huntingdon Road, Cambridge CB3 0DH, United Kingdom;3. Department of Geology, Faculty of Geology and Geophysics, University of Bucharest, Bălcescu Bd. 1, 010041, Romania;4. Department of Earth Sciences, University of Utrecht, Budapestlaan 4, Utrecht, The Netherlands;5. Faculty of Earth and Life Sciences, Department of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, Amsterdam 1081 HV, The Netherlands;6. National Institute of Marine Geology and Geo-Ecology (GEOECOMAR), 23-25 Dimitrie Onciul Street, Bucharest RO-024053, Romania;7. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France |
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| Abstract: | The Atacama Fault Zone is a major Mesozoic structure that trends along the Coastal Batholith of northern Chile. Part of the fault zone underwent a kinematic change from dip-slip to strike-slip displacement during the Early Cretaceous. The Las Tazas complex intruded the fault zone during this change. New analyses of country rock protomylonites from the edge of the complex firmly constrain the age of the change to 130 Ma and confirm that the complex was emplaced during active displacement along the fault zone. The intrusion heated its immediate country rocks and allowed localised ductile shearing during emplacement. Upper crustal intrusions like the Las Tazas complex are ideal targets for geochronological studies of major shear zones. |
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