Petrological features of the Santa Teresa Granitic Complex Southeastern Uruguay |
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| Institution: | 1. Departamento de Geolog??a, Instituto de Geolog??a y Paleontolog??a, Facultad de Ciencias, Iguá 4225, CP 11400, Montevideo, Uruguay;2. Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, UNESP, Av. 24A 1515, CP 178-CEP 13506-900, Rio Claro, São Paulo, Brazil;1. Politecnico di Torino, Engineering Faculty, Department of Environment, Land and Infrastructure Engineering, Corso Duca Degli Abruzzi 24, 10129, Torino, Italy;2. Dream s.r.l., Dedicated Reservoir Engineering and Management, Corso Trento 5, 10129, Torino, Italy;1. Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan;2. 44 rue du Cloître, 29280 Plouzané, France;3. Ifremer Centre de Brest, BP 70, 29280 Plouzané Cedex, France;4. Department of Earth Sciences, National Central University, Chung-Li 32001, Taiwan;5. Laboratoire GEOAZUR, UMR 7329 CNRS, 250 rue Albert Einstein, Sophia-Antipolis, 06560 Valbonne, France;1. Victoria University of Wellington, PO Box 600, Wellington, New Zealand;2. GNS Science, 1 Fairway Drive, Avalon 5010, Lower Hutt, New Zealand;1. Department of Physics, North Bengal University, Siliguri 734013, West Bengal, India;2. Department of Physics, Raiganj University College, Raiganj 733134, West Bengal, India;1. Applied Research in Ichnology and Sedimentology (ARISE) Group, Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;2. Groundwater Resources Research Group (GRRG), Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;3. Hemmera Envirochem Inc., 4730 Kingsway, Burnaby, British Columbia V5H 0C6, Canada |
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| Abstract: | The Santa Teresa Granitic Complex, located in the north-eastern region of the Rocha Department (Eastern Uruguay), is an epizonal Late-Brasiliano granite intruded in the low-grade metasedimentary sequence of the Rocha Group. Twelve different facies types, each with distinctive structural-petrographic features, were recognized during detailed mapping (1:50,000) of the central-eastern part of the granitic complex and form two magmatic suites. The Santa Teresa Calk-alkaline Suite is composed of mostly porphyritic 3a–3b granites with variable amounts of biotite, sphene, allanite, magnetite and microgranular enclaves and belongs to a middle to high potassium calk-alkaline series with high silica contents. In contrast, the Sierra de la Blanqueada Peraluminous Suite has a great variation of grain size, including 3a–3b granitic facies with variable content of muscovite, biotite, tourmaline, ilmenite and monazite. Zircon morphology was studied in both suites and also shows their calk-alkaline and peraluminous nature. The Santa Teresa Calk-alkaline Suite had a Late- to Post-orogenic setting whereas the Sierra de la Blanqueada Peraluminous Suite was formed during the crustal thickening related to a syn-collisional environment. |
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