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• W1978516557 abstract "A metapelite and an interlayered granite were studied from the Cinco Cerros area ca. 65 km WNW of the city of Mar del Plata. Garnet in these samples is slightly zoned with core and rim compositions of pyr17(gro + andr)6spes1.5alm75.5 and pyr13.5(gro + andr)5.5spes2alm80, respectively, in the metapelite. Corresponding compositions in the granite are pyr15(gro + andr)3.5spes3.5alm78 and pyr11(gro + andr)3.5spes4.5alm81. We used the PERPLE_X computer software package to calculate P–T pseudosections. From the pseudosection of the metapelite P–T conditions of 6.7 kbar and 670 °C were derived for an early metamorphic stage. Subsequently, a pressure release occurred at decreasing temperatures. The final metamorphic P–T conditions recorded by the studied rock are 4.5 kbar and 600 °C compatible with the absence of cordierite, staurolite, and an Al2SiO5-phase. Garnet in the granitoid crystallized between 715 and 690 °C at a pressure around 7.7 kbar. U–Th–Pb age dating with the electron microprobe was performed. 16 analyses of monazite in the metapelite formed three clusters resulting in ages of I: 2073 ± 11.4 (1σ) Ma, II: 1913 ± 11.0 (1σ) Ma, and III: 1805 ± 20.8 (1σ) Ma. Thus, the Paleoproterozoic metamorphic event can be related to the Trans-Amazonian cycle and was followed by slow cooling. As our study area is close to the margin of the Río de la Plata Craton, where abundant magmatic arc-derived plutonic rocks are outcropping, we interpret the derived P–T data as follows: A heating event (not recorded by the studied rocks) resulted from magmas that intruded during the Trans-Amazonian cycle. This event was followed by slow exhumation, probably caused by erosion, accompanied by thermal relaxation." @default.
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• W1978516557 date "2012-10-01" @default.
• W1978516557 modified "2023-10-18" @default.
• W1978516557 title "Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina" @default.
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• W1978516557 doi "https://doi.org/10.1016/j.jsames.2012.05.005" @default.
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