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Physical and chemical characteristics and eruptive model for the Santa Maria-type rhyolites in the Gramado Xavier region, Paraná Magmatic province

Grant number: 12/01973-0
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): September 01, 2012
Effective date (End): February 28, 2014
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Valdecir de Assis Janasi
Grantee:Letícia Freitas Guimarães
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The present project aims to contribute to a better understanding of the volcanology of the acid volcanism in the Paraná Magmatic Province aiming the development of a volcanic model for the Santa Maria Volcanic Sequence in the Gramado Xavier region. The rhyolitic magmatism amounts to about 2.5% of the volume of lavas in the province, and has some characteristics unlike those of typical rhyolitic magmas (e.g. eruptive temperatures as high as 1000°C), which appear to have resulted in an unique type of volcanic manifestation.Detailed field (structural geology) and laboratory (petrography, mineral and whole rock geochemistry; Sr isotope analyses) studies will be used in conjunction to better estimate the physical and chemical characteristics of the magmas, and thus give support to models of the eruptive style of these rocks, which are still highly controversial in the literature.

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Scientific publications
(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)
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, . (12/01973-0, 12/06082-6)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
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. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.

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