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Valdecir de Assis Janasi

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Universidade de São Paulo (USP). Instituto de Geociências (IGC)  (Institutional affiliation for the last research proposal)
Birthplace: Brazil

Graduated in Geology at the Instituto de Geociências, Universidade de São Paulo (1983), Master Degree (1986) and Ph.D. (1992) in Mineralogy and Petrology at Instituto de Geociências Universidade de São Paulo. Full Professor at the Instituto de Geociências, Universidade de São Paulo, in the field of Igneous Petrology. His interests are on several subjects related to the origin and evolution of magmas and consequences for the evolutoin of the Earth´s crust and mantle, mostly: granitic magmatism, acid-basic volcanism in the Paraná-Etendeka Province, rock and mineral geochemistry; analytical geochemistry, geological mapping and regional geology. Coordinator of the Geonalitica Core Facility since May, 2017. (Source: Lattes Curriculum)

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Scholarships abroad
FAPESP support in numbers * Updated December 07, 2019
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Scientific publications resulting from Research Grants and Scholarships under the grantee's responsibility (26)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

Publications25
Citations282
Cit./Article11.3
Data from Web of Science

PERUGINI, DIEGO; DE CAMPOS, CRISTINA P.; PETRELLI, MAURIZIO; DINGWELL, DONALD B.. Concentration variance decay during magma mixing: a volcanic chronometer. SCIENTIFIC REPORTS, v. 5, . Web of Science Citations: 17.

HENRIQUE-PINTO, R.; JANASI, V. A.; TASSINARI, C. C. G.; CARVALHO, B. B.; CIOFFI, C. R.; STRIKIS, N. M.. Provenance and sedimentary environments of the Proterozoic Sao Roque Group, SE-Brazil: Contributions from petrography, geochemistry and Sm-Nd isotopic systematics of metasedimentary rocks. Journal of South American Earth Sciences, v. 63, p. 191-207, . Web of Science Citations: 3.

FLORISBAL, LUANA MOREIRA; JANASI, VALDECIR DE ASSIS; BITENCOURT, MARIA DE FATIMA; HEAMAN, LARRY M.. Space-time relation of post-collisional granitic magmatism in Santa Catarina, southern Brazil: U-Pb LA-MC-ICP-MS zircon geochronology of coeval mafic-felsic magmatism related to the Major Gercino Shear Zone. Precambrian Research, v. 216, p. 132-151, . Web of Science Citations: 29.

CARVALHO, BRUNA BORGES; JANASI, VALDECIR DE ASSIS. Crystallization conditions and controls on trace element residence in the main minerals from the Pedra Branca Syenite, Brazil: An electron microprobe and LA-ICPMS study. LITHOS, v. 153, n. SI, p. 208-223, . Web of Science Citations: 5.

ALVES, ADRIANA; JANASI, VALDECIR DE ASSIS; SIMONETTI, ANTONIO; HEAMAN, LARRY. Microgranitic Enclaves as Products of Self-mixing Events: a Study of Open-system Processes in the Maua Granite, Sao Paulo, Brazil, Based on in situ Isotopic and Trace Elements in Plagioclase. JOURNAL OF PETROLOGY, v. 50, n. 12, p. 2221-2247, . Web of Science Citations: 15.

CARVALHO, BRUNA BORGES; JANASI, VALDECIR DE ASSIS; HENRIQUE-PINTO, RENATO. Geochemical and Sr-Nd-Pb isotope constraints on the petrogenesis of the K-rich Pedra Branca Syenite: Implications for the Neoproterozoic post-collisional magmatism in SE Brazil. LITHOS, v. 205, p. 39-59, . Web of Science Citations: 8.

ALMEIDA, VIDYA V.; JANASI, VALDECIR DE A.; SVISERO, DARCY P.; NANNINI, FELIX. Mathiasite-loveringite and priderite in mantle xenoliths from the Alto Paranaiba Igneous Province, Brazil: genesis and constraints on mantle metasomatism. CENTRAL EUROPEAN JOURNAL OF GEOSCIENCES, v. 6, n. 4, p. 614-632, . Web of Science Citations: 4.

ALVES, ADRIANA; JANASI, VALDECIR DE ASSIS; CAMPOS NETO, MARIO DA COSTA. Sources of granite magmatism in the Embu Terrane (Ribeira Belt, Brazil): Neoproterozoic crust recycling constrained by elemental and isotope (Sr-Nd-Pb) geochemistry. Journal of South American Earth Sciences, v. 68, n. SI, p. 205-223, . Web of Science Citations: 10.

JANASI, VALDECIR DE ASSIS; ANDRADE, SANDRA; VASCONCELLOS, ANTONIO CARLOS B. C.; HENRIQUE-PINTO, RENATO; ULBRICH, HORSTPETER H. G. J.. Timing and sources of granite magmatism in the Ribeira Belt, SE Brazil: Insights from zircon in situ U-Pb dating and Hf isotope geochemistry in granites from the Sao Roque Domain. Journal of South American Earth Sciences, v. 68, n. SI, p. 224-247, . Web of Science Citations: 3.

CARVALHO, B. B.; SAWYER, E. W.; JANASI, V. A.. Crustal reworking in a shear zone: transformation of metagranite to migmatite. JOURNAL OF METAMORPHIC GEOLOGY, v. 34, n. 3, p. 237-264, . Web of Science Citations: 34.

GUIMARAES, L. F.; DE CAMPOS, C. P.; JANASI, V. A.; LIMA, E. F.; DINGWELL, D. B.. Flow and fragmentation patterns in the silicic feeder system and related deposits in the Parana-Etendeka Magmatic Province, Sao Marcos, South Brazil. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, v. 358, p. 149-164, . Web of Science Citations: 2.

GUIMARAES, L. F.; RAPOSO, M. I. B.; JANASI, V. A.; CANON-TAPIA, E.; POLO, L. A.. An AMS study of different silicic units from the southern Parana-Etendeka Magmatic Province in Brazil: Implications for the identification of flow directions and local sources. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, v. 355, n. SI, p. 304-318, . Web of Science Citations: 4.

ALVES, ADRIANA; PEREIRA, GIOVANNA DE SOUZA; JANASI, VALDECIR DE ASSIS; HIGGINS, MICHAEL; POLO, LIZA ANGELICA; JURIAANS, ORLANDO STANLEY; RIBEIRO, BRUNO VIEIRA. The origin of felsic microgranitoid enclaves: Insights from plagioclase crystal size distributions and thermodynamic models. LITHOS, v. 239, p. 33-44, . Web of Science Citations: 3.

HENRIQUE-PINTO, R.; JANASI, V. A.; VASCONCELLOS, A. C. B. C.; SAWYER, E. W.; BARNES, S. -J.; BASEI, M. A. S.; TASSINARI, C. C. G.. Zircon provenance in meta-sandstones of the Sao Roque Domain: Implications for the Proterozoic evolution of the Ribeira Belt, SE Brazil. Precambrian Research, v. 256, p. 271-288, . Web of Science Citations: 19.

FLORISBAL, LUANA MOREIRA; HEAMAN, LARRY M.; JANASI, VALDECIR DE ASSIS; BITENCOURT, MARIA DE FATIMA. Tectonic significance of the Florianopolis Dyke Swarm, Parana-Etendeka Magmatic Province: A reappraisal based on precise U-Pb dating. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, v. 289, p. 140-150, . Web of Science Citations: 32.

PERUGINI, D.; DE CAMPOS, C. P.; PETRELLI, M.; MORGAVI, D.; VETERE, F. P.; DINGWELL, D. B.. Quantifying magma mixing with the Shannon entropy: Application to simulations and experiments. LITHOS, v. 236, p. 299-310, . Web of Science Citations: 5.

CARVALHO, B. B.; JANASI, V. A.; SAWYER, E. W.. Evidence for Paleoproterozoic anatexis and crustal reworking of Archean crust in the Sao Francisco Craton, Brazil: A dating and isotopic study of the Kinawa migmatite. Precambrian Research, v. 291, p. 98-118, . Web of Science Citations: 13.

HENRIQUE-PINTO, RENATO; JANASI, VALDECIR DE ASSIS; CARVALHO, BRUNA BORGES; CALADO, BRUNO DE OLIVEIRA; GROHMANN, CARLOS HENRIQUE. Integrated geological map of the Sao Roque Domain, North of Sao Paulo City - Brazil. Journal of Maps, v. 10, n. 3, p. 434-439, . Web of Science Citations: 1.

FLORISBAL, LUANA MOREIRA; JANASI, VALDECIR DE ASSIS; BITENCOURT, MARIA DE FATIMA; STOLL NARDI, LAURO VALENTIM; HEAMAN, LARRY M.. Contrasted crustal sources as defined by whole-rock and Sr-Nd-Pb isotope geochemistry of neoproterozoic early post-collisional granitic magmatism within the Southern Brazilian Shear Belt, Camboriu, Brazil. Journal of South American Earth Sciences, v. 39, p. 24-43, . Web of Science Citations: 12.

ALVES, ADRIANA; JANASI, VALDECIR DE ASSIS; CAMPOS NETO, MARIO DA COSTA; HEAMAN, LARRY; SIMONETTI, ANTONIO. U-Pb geochronology of the granite magmatism in the Embu Terrane: Implications for the evolution of the Central Ribeira Belt, SE Brazil. Precambrian Research, v. 230, p. 1-12, . Web of Science Citations: 25.

ALVES, ADRIANA; JANASI, VALDECIR DE ASSIS; CAMPOS NETO, MARIO DA COSTA. Sources of granite magmatism in the Embu Terrane (Ribeira Belt, Brazil): Neoproterozoic crust recycling constrained by elemental and isotope (Sr-Nd-Pb) geochemistry. Journal of South American Earth Sciences, v. 68, n. SI, p. 205-223, . Web of Science Citations: 10.

JANASI, VALDECIR DE ASSIS; ANDRADE, SANDRA; VASCONCELLOS, ANTONIO CARLOS B. C.; HENRIQUE-PINTO, RENATO; ULBRICH, HORSTPETER H. G. J.. Timing and sources of granite magmatism in the Ribeira Belt, SE Brazil: Insights from zircon in situ U-Pb dating and Hf isotope geochemistry in granites from the Sao Roque Domain. Journal of South American Earth Sciences, v. 68, n. SI, p. 224-247, . Web of Science Citations: 3.

CARVALHO, B. B.; SAWYER, E. W.; JANASI, V. A.. Crustal reworking in a shear zone: transformation of metagranite to migmatite. JOURNAL OF METAMORPHIC GEOLOGY, v. 34, n. 3, p. 237-264, . Web of Science Citations: 34.

GUIMARAES, L. F.; DE CAMPOS, C. P.; JANASI, V. A.; LIMA, E. F.; DINGWELL, D. B.. Flow and fragmentation patterns in the silicic feeder system and related deposits in the Parana-Etendeka Magmatic Province, Sao Marcos, South Brazil. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, v. 358, p. 149-164, . Web of Science Citations: 2.

GUIMARAES, L. F.; RAPOSO, M. I. B.; JANASI, V. A.; CANON-TAPIA, E.; POLO, L. A.. An AMS study of different silicic units from the southern Parana-Etendeka Magmatic Province in Brazil: Implications for the identification of flow directions and local sources. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, v. 355, n. SI, p. 304-318, . Web of Science Citations: 4.

ALVES, ADRIANA; PEREIRA, GIOVANNA DE SOUZA; JANASI, VALDECIR DE ASSIS; HIGGINS, MICHAEL; POLO, LIZA ANGELICA; JURIAANS, ORLANDO STANLEY; RIBEIRO, BRUNO VIEIRA. The origin of felsic microgranitoid enclaves: Insights from plagioclase crystal size distributions and thermodynamic models. LITHOS, v. 239, p. 33-44, . Web of Science Citations: 3.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

MARTINS, Lucelene. Condições de cristalização de granitos sin- e tardi-orogênicos da porção central do batólito Agudos Grandes, SP, com base em geoquímica de minerais e rochas. 2001. Dissertação (Mestrado) - Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

FLORISBAL, Luana Moreira. Petrogênese de granitos sintectônicos em ambiente pós-colisional do escudo catarinense: estudo integrado de geologia estrutural, geoquímica elemental e isotópica SR-ND-PB e geocronologia U-PB em zircão. 2011. Tese (Doutorado) – Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

PEREIRA, Giovanna de Souza. O significado dos enclaves microgranulares félsicos na evolução de magmas graníticos: Petrologia dos enclaves do Plúton Salto, Batólito Itu, SP. 2013. Dissertação (Mestrado) - Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

GUIMARÃES, Letícia Freitas. Caracteristicas físicas e químicas e modelo eruptivo para os riolitos tipo Santa Maria (Província Magmática Paraná) na região de Gramado Xavier, RS. 2014. Dissertação (Mestrado) - Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

MARTINS, Lucelene. Geração e migração de magmas graníticos na crosta continental: estudos de detalhe em granitos e migmatitos da região de Nazaré Paulista (SP). 2006. Tese (Doutorado) – Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

ALVES, Adriana. Petrogênese de plútons graníticos do leste paulista: geocronologia, geoquímica elemental e isotópica. 2009. Tese (Doutorado) – Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

FREITAS, Vivian Azor de. A geração de magmas ácidos na Província Magmática Paraná, região de Piraju-Ourinhos (SP): uma contribuição da geoquímica isotópica e de elementos traço em rochas e minerais. 2009. Dissertação (Mestrado) - Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

ALMEIDA, Vidyã Vieira de. Mineralogia e petrologia de xenólitos mantélicos das regiões de Ubatuba (SP) e Monte Carmelo (MG): evidências de fusão parcial e metassomatismo no manto superior do sudeste do Brasil. 2009. Dissertação (Mestrado) - Instituto de Geociências. Universidade de São Paulo (USP). São Paulo.

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