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A mantle-plume trigger for one of Earth’s largest Precambrian silicic large igneous provinces in the Amazonian Craton

Ibañez-Mejia, Mauricio ; Ernst, Richard E. ; Kroonenberg, Salomon ; Urbani, Franco ; Söderlund, Ulf LU ; Kamo, Sandra ; Lewis, Madeline ; Eddy, Michael P. ; Maclennan, Scott A. and Antonio, Paul , et al. (2025) In Geology 53(8). p.647-651
Abstract

The Amazonian Craton is host to one of Earth’s largest Proterozoic silicic large igneous provinces (SLIPs), the Orocaima SLIP (ca. 1.98 Ga). Nevertheless, the mechanism(s) responsible for this large-flux felsic magmatic event and its relationships with regional tectonics and/or mantle processes remain debated. New geochronologic and geochemical results from multiple mafic dike swarms in the Amazonian Craton, namely the Guaniamo, Rio Aro, El Manteco-Supamo, and Goboy swarms, reveal a close temporal, spatial, and geochemical association with the Orocaima SLIP. The radiating arrangement of these swarms spanning 90° of arc, their strongly tholeiitic geochemical affinity, and their short-lived emplacement ca. 1.98 Ga including in regions far... (More)

The Amazonian Craton is host to one of Earth’s largest Proterozoic silicic large igneous provinces (SLIPs), the Orocaima SLIP (ca. 1.98 Ga). Nevertheless, the mechanism(s) responsible for this large-flux felsic magmatic event and its relationships with regional tectonics and/or mantle processes remain debated. New geochronologic and geochemical results from multiple mafic dike swarms in the Amazonian Craton, namely the Guaniamo, Rio Aro, El Manteco-Supamo, and Goboy swarms, reveal a close temporal, spatial, and geochemical association with the Orocaima SLIP. The radiating arrangement of these swarms spanning 90° of arc, their strongly tholeiitic geochemical affinity, and their short-lived emplacement ca. 1.98 Ga including in regions far from any inferred subducting plate margins all strongly suggest: (1) an intraplate, plume-related origin, and (2) a radiating arrangement defining a plume center located at ∼2.5°N, 61.2°W, near the SW margin of proto-Amazonia at the time and coinciding with the location of the Takutu graben. Discovery of this previously unrecognized radiating swarm array, herein grouped within a proposed Yanomami large igneous province, and its close spatial and temporal association with the Orocaima SLIP suggests a plume-triggered origin for SLIP development, thus arguing against accretionary models for the origin of the Orocaima silicic magmatic belt.

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type
Contribution to journal
publication status
published
subject
in
Geology
volume
53
issue
8
pages
5 pages
publisher
Geological Society of America
external identifiers
  • scopus:105015310009
ISSN
0091-7613
DOI
10.1130/G53164.1
language
English
LU publication?
yes
id
b548210b-6f34-4da2-acff-f9705e8640a0
date added to LUP
2025-11-11 11:01:10
date last changed
2025-11-11 11:01:31
@article{b548210b-6f34-4da2-acff-f9705e8640a0,
  abstract     = {{<p>The Amazonian Craton is host to one of Earth’s largest Proterozoic silicic large igneous provinces (SLIPs), the Orocaima SLIP (ca. 1.98 Ga). Nevertheless, the mechanism(s) responsible for this large-flux felsic magmatic event and its relationships with regional tectonics and/or mantle processes remain debated. New geochronologic and geochemical results from multiple mafic dike swarms in the Amazonian Craton, namely the Guaniamo, Rio Aro, El Manteco-Supamo, and Goboy swarms, reveal a close temporal, spatial, and geochemical association with the Orocaima SLIP. The radiating arrangement of these swarms spanning 90° of arc, their strongly tholeiitic geochemical affinity, and their short-lived emplacement ca. 1.98 Ga including in regions far from any inferred subducting plate margins all strongly suggest: (1) an intraplate, plume-related origin, and (2) a radiating arrangement defining a plume center located at ∼2.5°N, 61.2°W, near the SW margin of proto-Amazonia at the time and coinciding with the location of the Takutu graben. Discovery of this previously unrecognized radiating swarm array, herein grouped within a proposed Yanomami large igneous province, and its close spatial and temporal association with the Orocaima SLIP suggests a plume-triggered origin for SLIP development, thus arguing against accretionary models for the origin of the Orocaima silicic magmatic belt.</p>}},
  author       = {{Ibañez-Mejia, Mauricio and Ernst, Richard E. and Kroonenberg, Salomon and Urbani, Franco and Söderlund, Ulf and Kamo, Sandra and Lewis, Madeline and Eddy, Michael P. and Maclennan, Scott A. and Antonio, Paul and Mason, Paul R.D. and Bilali, Hafida El}},
  issn         = {{0091-7613}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{647--651}},
  publisher    = {{Geological Society of America}},
  series       = {{Geology}},
  title        = {{A mantle-plume trigger for one of Earth’s largest Precambrian silicic large igneous provinces in the Amazonian Craton}},
  url          = {{http://dx.doi.org/10.1130/G53164.1}},
  doi          = {{10.1130/G53164.1}},
  volume       = {{53}},
  year         = {{2025}},
}