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- W1995575791 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. El Complejo Granı́tico Santa Teresa está localizado en la región noreste del Departamento de Rocha, Uruguay y corresponde a un granito epizonal emplazado en los metasedimentos de bajo grado del Grupo Rocha. El mapeo faciológico a escala 1:50,000 del sector centro-este del complejo permitió el reconocimiento de doce facies granı́ticas diferentes que fueron agrupadas en dos suites magmáticas denominadas, respectivamente, como Suite Calco-alcalina Santa Teresa y Suite Peraluminosa Sierra de la Blanqueada. La Suite Calco-alcalina Santa Teresa está compuesta por seis facies petrográficas predominantemente porfirı́ticas, de composición monzo- a sienogranı́tica con presencia de esfeno, alanita y magnetita. Geoquı́micamente son de naturaleza calco-alcalina, de medio a alto potasio con altos tenores de sı́lice. La Suı́te Peraluminosa Sierra de la Blanqueada está representada por seis fácies granı́ticas, inequigranulares y porfirı́ticas, de composición monzo- y sienogranı́ticas con muscovita, turmalina, ilmenita y monacita como principales accesorios. Los estudios de tipologı́a del circón confirman la naturaleza calco-alcalina y peraluminosa de ambas suites. Geotectónicamente, los granitoides calco-alcalinos se encuadran como tardi- a post-orogénicos y mientras que los peraluminosos estarı́an relacionados al espesamiento crustal de ambientes sincolisionales." @default.
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- W1995575791 date "1999-09-01" @default.
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- W1995575791 title "Petrological features of the Santa Teresa Granitic Complex Southeastern Uruguay" @default.
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- W1995575791 doi "https://doi.org/10.1016/s0895-9811(99)00033-4" @default.
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