Using Self-Organizing Maps (SOM) technique to compare chemical characteristics between Mesozoic LIPs (Large Igneous Provinces) in the South America

• Grant number: 18/24769-5
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: March 06, 2019
• End date: March 05, 2020
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Maria Helena Bezerra Maia de Hollanda
• Grantee: Antomat Avelino de Macêdo Filho
• Supervisor: Stephen James Fraser
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: University of Queensland, Brisbane (UQ), Australia
• Associated to the scholarship: 17/13130-0 - An integrated geochemical and isotope study to characterize the Equatorial Atlantic Magmatic Province (EQUAMP), BP.DR

Abstract

Mafic dike swarms and sills intruding the Precambrian Borborema Province and the Paleozoic Parnaíba Basin (NE Brazil) have been recently proposed as part of a hitherto known large igneous province (LIP) in South America, named Equatorial Atlantic Magmatic Province (EQUAMP; Hollanda et al., 2018). This proposal is based on geochemical and geochronological data of two regional magmatic events - the Rio Ceará Mirim dyke swarm and the Sardinha sills, until now individually understood as events related to the opening of the Atlantic Ocean during the Cretaceous. Genetic and temporal correlations between mafic dykes and sills are currently being discussed within the EQUAMP Project funded by FAPESP 2017/08423-9, being the focus of my PhD project (2017/13130-0). One relevant question that raises from the recognition of a new Mesozoic LIP in South America is to understand its geodynamic relationship with the other LIPs - Central Atlantic Magmatic Province (CAMP) and Paraná-Etendeka. From the geochemical point of view, the relationship should be explored after comparisons between their geochemical (and isotopic) signature in order to well constrain the (1) magmatic diversity within EQUAMP LIP (sills and dikes) and between LIPs (EQUAMP and others), to discuss which were the mantle source(s) activated during the LIP formation and, furthermore, if they were a common source or not. For achieving these objectives, we intend to apply a computacional modeling based on the Self-Organizing Maps (SOM) technique as a way to strength the robustness of the data analysis and, therefore, further correlations between the LIPs that were related with the Atlantic Ocean opening.

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)

COSTA MELO, ALANNY CHRISTINY; DE CASTRO, DAVID LOPES; FRASER, STEPHEN JAMES; MACEDO FILHO, ANTOMAT AVELINO. Using self-organizing maps in airborne geophysical data for mapping mafic dyke swarms in NE Brazil. JOURNAL OF APPLIED GEOPHYSICS, v. 192, SEP 2021. (17/08423-9, 17/13130-0, 18/24769-5)

MACEDO FILHO, ANTOMAT A.; HOLLANDA, MARIA HELENA B. M.; FRASER, STEPHEN; OLIVEIRA, ALISSON L.; MELO, ALANNY C. C.; DANTAS, ALANA R.. Correlations among large igneous provinces related to the West Gondwana breakup: A geochemical database reappraisal of Early Cretaceous plumbing systems. GEOSCIENCE FRONTIERS, v. 14, n. 1, p. 26-pg., 2023-01-01. (18/24769-5, 17/13130-0)