Papers by Iaponira Paiva Gomes
CPRM, 2020
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CPRM, 2021
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Journal of the Geological Survey of Brazil, 2019
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Journal of the Geological Survey of Brazil, 2021
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Journal of South American Earth Sciences, Feb 4, 2015
ABSTRACT The Algodões metavolcano-sedimentary sequence is located at the northern margin of the A... more ABSTRACT The Algodões metavolcano-sedimentary sequence is located at the northern margin of the Archean/Paleoproterozoic Troia Massif, northern Borborema Province (NE Brazil). It represents a well-preserved Paleoproterozoic greenstone-like sequence affected by two major plutonic events. The early plutonism, represented by the Cipó orthogneisses, mainly comprises biotite-bearing metatonalites, which share with Archean tonalite-trondjhemite-granodiorite (TTG) similar geochemical signatures. For these rocks, we report U-Pb (LA-ICPMS) zircons ages of 2189 ± 14 Ma and 2180 ± 15 Ma. A subsequent plutonic magmatism occurred at ~2150-2130 Ma and is mainly represented by hornblende-bearing dioritic to tonalitic orthogneisses of the Madalena Suite and São José da Macaoca Complex. Geochemical data indicate that these dioritic/tonalitic orthogneisses have adakitic characteristics and strongly suggest mantle-related magmas. A (sensu stricto) granitic plutonism (Serra da Palha orthogneisses) also intruded the Algodões sequence and yielded U-Pb (LA-ICPMS) zircon age of 2150 ± 16 Ma. These granitic orthogneisses show high-K content, A-type characteristics and probably derived from partial melting of a crustal (tonalitic) source. We suggest that the early ~2190-2160 Ma TTG plutons probably developed in intra-oceanic arc setting, whereas the following ~2150-2130 Ma adakitic plutons and A-type granitic magmatism developed in response to arc-continent collision.
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Journal of South American Earth Sciences, Feb 4, 2015
ABSTRACT The Algodões metavolcano-sedimentary sequence is located at the northern margin of the A... more ABSTRACT The Algodões metavolcano-sedimentary sequence is located at the northern margin of the Archean/Paleoproterozoic Troia Massif, northern Borborema Province (NE Brazil). It represents a well-preserved Paleoproterozoic greenstone-like sequence affected by two major plutonic events. The early plutonism, represented by the Cipó orthogneisses, mainly comprises biotite-bearing metatonalites, which share with Archean tonalite-trondjhemite-granodiorite (TTG) similar geochemical signatures. For these rocks, we report U-Pb (LA-ICPMS) zircons ages of 2189 ± 14 Ma and 2180 ± 15 Ma. A subsequent plutonic magmatism occurred at ~2150-2130 Ma and is mainly represented by hornblende-bearing dioritic to tonalitic orthogneisses of the Madalena Suite and São José da Macaoca Complex. Geochemical data indicate that these dioritic/tonalitic orthogneisses have adakitic characteristics and strongly suggest mantle-related magmas. A (sensu stricto) granitic plutonism (Serra da Palha orthogneisses) also intruded the Algodões sequence and yielded U-Pb (LA-ICPMS) zircon age of 2150 ± 16 Ma. These granitic orthogneisses show high-K content, A-type characteristics and probably derived from partial melting of a crustal (tonalitic) source. We suggest that the early ~2190-2160 Ma TTG plutons probably developed in intra-oceanic arc setting, whereas the following ~2150-2130 Ma adakitic plutons and A-type granitic magmatism developed in response to arc-continent collision.
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Papers by Iaponira Paiva Gomes