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The 920–900 Ma Bahia-Gangila LIP of the São Francisco and Congo cratons and link with Dashigou-Chulan LIP of North China craton : New insights from U-Pb geochronology and geochemistry

Chaves, Alexandre de Oliveira ; Ernst, Richard E. ; Söderlund, Ulf LU ; Wang, Xinping LU and Naeraa, Tomas LU (2019) In Precambrian Research 329. p.124-137
Abstract

A widespread mafic sill and dyke unit (the Pedro Lessa suite) adjacent to the southeastern São Francisco (SF) craton (eastern South America) is dated as 940 ± 42 Ma, 912 ± 17 Ma, and 986 ± 64 Ma (based on combined ID-TIMS and LA-ICPMS analyses on baddeleyite grains) on the Santa Maria de Itabira gabbroic intrusion. These ages suggest membership in the previously defined ca. 920–900 Ma Large Igneous Province (LIP) (herein referred to as the Bahia-Gangila LIP) of the reconstructed São Francisco and formerly adjacent Congo craton (Africa). Additional mafic and felsic units throughout the SF craton are also linked (based on a literature review), thus expanding the size of the reconstructed LIP to ca. 1,500,000 km2. Geochemistry... (More)

A widespread mafic sill and dyke unit (the Pedro Lessa suite) adjacent to the southeastern São Francisco (SF) craton (eastern South America) is dated as 940 ± 42 Ma, 912 ± 17 Ma, and 986 ± 64 Ma (based on combined ID-TIMS and LA-ICPMS analyses on baddeleyite grains) on the Santa Maria de Itabira gabbroic intrusion. These ages suggest membership in the previously defined ca. 920–900 Ma Large Igneous Province (LIP) (herein referred to as the Bahia-Gangila LIP) of the reconstructed São Francisco and formerly adjacent Congo craton (Africa). Additional mafic and felsic units throughout the SF craton are also linked (based on a literature review), thus expanding the size of the reconstructed LIP to ca. 1,500,000 km2. Geochemistry reveals high Ti OIB signature for most units and low Ti E-MORB composition for the Gangila flood basalts, marking the initiation of attempted ocean opening. Geochemistry of the Bahia-Gangila LIP is also compared with the ca. 920–900 Ma Dashigou-Chulan LIP of the North China craton, and implications for three possible reconstructions of SF/Congo craton with the North China craton are considered.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Geochemistry, Large igneous province, North China craton, São Francisco/Congo craton, U-Pb
in
Precambrian Research
volume
329
pages
124 - 137
publisher
Elsevier
external identifiers
  • scopus:85052879508
ISSN
0301-9268
DOI
10.1016/j.precamres.2018.08.023
language
English
LU publication?
yes
id
4a7b16fe-59bf-4560-948d-cafa332928fe
date added to LUP
2018-11-06 15:20:01
date last changed
2020-02-12 09:43:26
@article{4a7b16fe-59bf-4560-948d-cafa332928fe,
  abstract     = {<p>A widespread mafic sill and dyke unit (the Pedro Lessa suite) adjacent to the southeastern São Francisco (SF) craton (eastern South America) is dated as 940 ± 42 Ma, 912 ± 17 Ma, and 986 ± 64 Ma (based on combined ID-TIMS and LA-ICPMS analyses on baddeleyite grains) on the Santa Maria de Itabira gabbroic intrusion. These ages suggest membership in the previously defined ca. 920–900 Ma Large Igneous Province (LIP) (herein referred to as the Bahia-Gangila LIP) of the reconstructed São Francisco and formerly adjacent Congo craton (Africa). Additional mafic and felsic units throughout the SF craton are also linked (based on a literature review), thus expanding the size of the reconstructed LIP to ca. 1,500,000 km<sup>2</sup>. Geochemistry reveals high Ti OIB signature for most units and low Ti E-MORB composition for the Gangila flood basalts, marking the initiation of attempted ocean opening. Geochemistry of the Bahia-Gangila LIP is also compared with the ca. 920–900 Ma Dashigou-Chulan LIP of the North China craton, and implications for three possible reconstructions of SF/Congo craton with the North China craton are considered.</p>},
  author       = {Chaves, Alexandre de Oliveira and Ernst, Richard E. and Söderlund, Ulf and Wang, Xinping and Naeraa, Tomas},
  issn         = {0301-9268},
  language     = {eng},
  pages        = {124--137},
  publisher    = {Elsevier},
  series       = {Precambrian Research},
  title        = {The 920–900 Ma Bahia-Gangila LIP of the São Francisco and Congo cratons and link with Dashigou-Chulan LIP of North China craton : New insights from U-Pb geochronology and geochemistry},
  url          = {http://dx.doi.org/10.1016/j.precamres.2018.08.023},
  doi          = {10.1016/j.precamres.2018.08.023},
  volume       = {329},
  year         = {2019},
}