Limited and localized magmatism in the Central Atlantic Magmatic Province
| Autor: | Daniel Lizarralde, S. H. Harder, R. E. Marzen, D. M. Heffner, D. J. Shillington, J. H. Knapp, J. K. Davis |
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| Rok vydání: | 2019 |
| Předmět: |
Multidisciplinary
Rift 010504 meteorology & atmospheric sciences Science Tectonics Geochemistry General Physics and Astronomy Crust General Chemistry 010502 geochemistry & geophysics 01 natural sciences General Biochemistry Genetics and Molecular Biology Mantle (geology) Article Geophysics Lithosphere Magmatism lcsh:Q Sedimentary rock lcsh:Science Geology Seismology 0105 earth and related environmental sciences |
| Zdroj: | Nature Communications Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020) |
| ISSN: | 2041-1723 |
| Popis: | 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 ( The Central Atlantic Magmatic Province is the most aerially extensive magmatic event in Earth’s history, yet few constraints exist on the volumes of intrusions at depth. Here, the authors find limited intrusive volumes beneath the South Georgia Rift, consistent with modest potential mantle temperatures ( |
| Databáze: | OpenAIRE |
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