Elemental and Sr-Nd-Pb Isotope Geochemistry of the Florianópolis Dyke Swarm (Paraná Magmatic Province): Crustal Contamination and Mantle Source Constraints
| Autor: | A. De Min, Ana Maria Graciano Figueiredo, Giuliano Bellieni, Leila Soares Marques, Eduardo R.V. Rocha-Júnior, Marly Babinski |
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| Přispěvatelé: | Marques, L. S., DE MIN, Angelo, Rocha Júnior, E. R. V., Babinski, M., Bellieni, G., F. i. g. u. e. i. r. e. d. o., A. M. G. |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Florianopolis dyke swarms
Mafic dyke swarms 010504 meteorology & atmospheric sciences Outcrop Mafic dyke swarm Paraná Magmatic Province Continental Flood Basalts crustal contamination Mantle source Geochemistry 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) Geochemistry and Petrology 0105 earth and related environmental sciences geography Radiogenic nuclide geography.geographical_feature_category Isotope Swarm behaviour Contamination MANTO DA TERRA Volcanic rock Geophysics Isotope geochemistry Florianopolis dyke swarm Continental Flood Basalt Geology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The Florianopolis Dyke Swarm is located in Santa Catarina island, comprising also the adjacent continental area, and belog to the Parana Magmatic Province (PMP). the dyke outcrops in the island are 0.1-70.0 m thick and most of them are coast-parallel (NE-SW trending), with subordinate NW-SE trending. the vast majority of the dykes has SiO2 varying from 50 to 55 wt% and relatively high-Ti (TiO2>3.0wt%) contents and these rocks were divided using the criteria commonly used to distinguish the different magma types identified in the volcanic rocks from the PMP. The Urubicy dykes (Sr>550 ppm) are the most abundant and some of them experienced crustal contamination reaching to 10%, as evidenced by low P2O5/K2O (0,30-0,21), high (Rb/Ba)PM (1.0-2.2), and radiogenic Sr and Pb isotopic composition (87Sr/86Sri = 0.70716-back to 125 ma) and 206Pb/204Pbm up to 19.093. The Pitanga (Sr |
| Databáze: | OpenAIRE |
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