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- W1857245097 abstract "The Maua granitic massif is an elongated body dominated by a porphyritic biotite monzogranite which grades, in its southwestern extremity, to lighter equigranular granite and greisenized (tourmaline)-biotite-muscovite leucogranite. Abundant enclaves can be divided in three types: grey micro granular enclaves, with rounded shapes and igneous textures, are compositionally similar to the enclosing porphyritic granites; dark, rounded, micaceous enclaves have high K/Na, and may correspond to highly assimilated metasedimentary xenoliths; and angulous gneiss xenoliths seem to be fragments of an unexposed type of country rock. The primitive magmas that formed the massif were Zr, P and LREE-saturated, and became progressively enriched in U, Cs, Y, HREE, F and possibly Ta. Geochemical data show that most of the observed compositional variation can be a reflection of crystal fractionation at the level of emplacement. However, other processes such as magma mixing, contamination and post-magmatic alteration seem to respond for local chemical variations. U-Pb monazite dating point to a crystallization age of 588 ± 2 Ma which is ca. 20 myr. younger than those of nearby crust-derived syn-orogenic granites." @default.
- W1857245097 created "2016-06-24" @default.
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- W1857245097 date "2001-09-01" @default.
- W1857245097 modified "2023-09-25" @default.
- W1857245097 title "The Mauá granitic massif, Central Ribeira Belt, São Paulo: petrography geochemistry and U-Pb dating" @default.
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- W1857245097 doi "https://doi.org/10.5327/rbg.v31i3.948" @default.
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