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- W2913591639 endingPage "22" @default.
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- W2913591639 abstract "Abstract We present new Lu Hf and Oxygen isotopic analyses and complementary whole-rock Nd isotopic data for three A-type Paleoproterozoic suites (1880 Ma to 1857 Ma; Serra dos Carajas, Velho Guilherme, and Jamon) and related granites of the Carajas Province, eastern Amazon Craton, Brazil. Zircon grains from all the granites have remarkably restricted initial 176Hf/177Hf and strongly negative eHf(t) values ranging from −9 to −18, and δ18O fairly homogeneous varying from 5.50‰ to 7.00‰. Small differences were observed internally in the plutons or between them. These differences can result for contrasts in the crustal domains of the Carajas Province that were the source of the granites or of local contamination processes. Hf model ages indicate Paleoarchean sources (3.3 Ga to 3.6 Ga) with a minor contribution from Mesoarchean (3.0 Ga to 3.2 Ga) melts for these granites. This model ages are older than the exposed Archean country rocks of the Orosirian granites of the Carajas Province and more investigation is needed to verify the real existence of that older Archean crust. On the other hand, Nd isotope data and geochemical-petrological studies indicate that the Carajas granites derived from Mesoarchean granitoid sources and this hypothesis should be retained. The studied samples have Hf O isotopic compositions that overlap within error, and evidence of contamination (crustal assimilation or mixing) for a mantle-derived magma cannot be seen. These plutons crystallized from magmas generated by melting of pre-existing igneous rocks with possibly in the Velho Guilherme Suite a minor contribution from a supracrustal (metasedimentary) component is envisaged. The Nd, Hf, and O isotope compositions of the Paleoproterozoic granites of Carajas Province clearly attest to an igneous ancient crustal source in the origin of their magmas. This anorogenic granites represent a large volume of granitic magmatism generated in the late Palaeoproterozoic in the eastern of the Amazon Craton. This work shows the importance of the Archean source in the generation of the A-type Paleoproterozoic granites from Carajas province. These granites are an example of A-type granites derived essentially from crustal sources without significant influence of mantle magmas except as a source of heat." @default.
- W2913591639 created "2019-02-21" @default.
- W2913591639 creator A5030432258 @default.
- W2913591639 creator A5051411866 @default.
- W2913591639 creator A5051653078 @default.
- W2913591639 creator A5051756979 @default.
- W2913591639 creator A5052648518 @default.
- W2913591639 date "2019-05-01" @default.
- W2913591639 modified "2023-10-03" @default.
- W2913591639 title "Petrogenesis of the Paleoproterozoic (Orosirian) A-type granites of Carajás Province, Amazon Craton, Brazil: Combined in situ Hf O isotopes of zircon" @default.
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