Limited and localized magmatism in the Central Atlantic Magmatic Province
Marzen, Rachel E.
Shillington, Donna J.
Knapp, James H.
Heffner, David M.
Davis, Joshua K.
Harder, Steven H.
MetadataShow full item record
The Central Atlantic Magmatic Province (CAMP) is the most aerially extensive magmatic event in Earth’s history, but many questions remain about its origin, volume, and distribution. Despite many observations of CAMP magmatism near Earth’s surface, few constraints exist on CAMP intrusions at depth. Here we present detailed constraints on crustal and upper mantle structure from wide-angle seismic data across the Triassic South Georgia Rift that formed shortly before CAMP. Lower crustal magmatism is concentrated where synrift sedimentary fill is thickest and the crust is thinnest, suggesting that lithospheric thinning influenced the locus and volume of magmatism. The limited distribution of lower crustal intrusions implies modest total CAMP volumes of 85,000 to 169,000 km3 beneath the South Georgia Rift, consistent with moderately elevated mantle potential temperatures (<1500 °C). These results suggest that CAMP magmatism in the South Georgia Rift is caused by syn-rift decompression melting of a warm, enriched mantle.
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marzen, R. E., Shillington, D. J., Lizarralde, D., Knapp, J. H., Heffner, D. M., Davis, J. K., & Harder, S. H. Limited and localized magmatism in the Central Atlantic Magmatic Province. Nature Communications, 11(1), (2020): 3397, doi:10.1038/s41467-020-17193-6.
Suggested CitationMarzen, R. E., Shillington, D. J., Lizarralde, D., Knapp, J. H., Heffner, D. M., Davis, J. K., & Harder, S. H. (2020). Limited and localized magmatism in the Central Atlantic Magmatic Province. Nature Communications, 11(1), 3397.
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Korenaga, Jun (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-02)This thesis studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the ...
Characterization of sills associated with the U reflection on the Newfoundland margin : evidence for widespread early post-rift magmatism on a magma-poor rifted margin Peron-Pinvidic, Gwenn; Shillington, Donna J.; Tucholke, Brian E. (John Wiley & Sons, 2010-05-25)Drilling during ODP Leg 210 penetrated two post-rift sills (dated as ∼105.3 and ∼97.8 Ma) in the deep sediments overlying basement of the continent–ocean transition zone on the magma-poor Newfoundland margin. The sill ...
Geist, Dennis J.; Fornari, Daniel J.; Kurz, Mark D.; Harpp, Karen S.; Soule, Samuel A.; Perfit, Michael R.; Koleszar, Alison M. (American Geophysical Union, 2006-12-19)New multibeam and side-scan sonar surveys of Fernandina volcano and the geochemistry of lavas provide clues to the structural and magmatic development of Galápagos volcanoes. Submarine Fernandina has three well-developed ...