dc.contributor.author
Gómez-García, Ángela María
dc.contributor.author
Le Breton, Eline
dc.contributor.author
Scheck-Wenderoth, Magdalena
dc.contributor.author
Monsalve, Gaspar
dc.contributor.author
Anikiev, Denis
dc.date.accessioned
2021-04-15T11:37:46Z
dc.date.available
2021-04-15T11:37:46Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/30364
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-30105
dc.description.abstract
Remnants of the Caribbean Large Igneous Plateau (C-LIP) are found as thicker than normal oceanic crust in the Caribbean Sea that formed during rapid pulses of magmatic activity at similar to 91-88 and similar to 76 Ma. Strong geochemical evidence supports the hypothesis that the C-LIP formed due to melting of the plume head of the Galapagos hotspot, which interacted with the Farallon (Proto-Caribbean) plate in the eastern Pacific. Considering plate tectonics theory, it is expected that the lithospheric portion of the plume-related material migrated within the Proto-Caribbean plate in a north-north-eastward direction, developing the present-day Caribbean plate. In this research, we used 3D lithospheric-scale, data-integrative models of the current Caribbean plate setting to reveal, for the first time, the presence of positive density anomalies in the uppermost lithospheric mantle. These models are based on the integration of up-to-date geophysical datasets from the Earth's surface down to 200 km depth, which are validated using high-resolution free-air gravity measurements. Based on the gravity residuals (modelled minus observed gravity), we derive density heterogeneities both in the crystalline crust and the uppermost oceanic mantle (<50 km). Our results reveal the presence of two positive mantle density anomalies beneath the Colombian and the Venezuelan basins, interpreted as the preserved fossil plume conduits associated with the C-LIP formation. Such mantle bodies have never been identified before, but a positive density trend is also indicated by S-wave tomography, at least down to 75 km depth. The interpreted plume conduits spatially correlate with the thinner crustal regions present in both basins; therefore, we propose a modification to the commonly accepted tectonic model of the Caribbean, suggesting that the thinner domains correspond to the centres of uplift due to the inflow of the hot, buoyant plume head. Finally, using six different kinematic models, we test the hypothesis that the C-LIP originated above the Galapagos hotspot; however, misfits of up to similar to 3000 km are found between the present-day hotspot location and the mantle anomalies, reconstructed back to 90 Ma. Therefore, we shed light on possible sources of error responsible for this offset and discuss two possible interpretations: (1) the Galapagos hotspot migrated (similar to 1200-3000 km) westward while the Caribbean plate moved to the north, or (2) the C-LIP was formed by a different plume, which - if considered fixed - would be nowadays located below the South American continent.
en
dc.format.extent
24 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
Northwestern South America
en
dc.subject
Gulf of Mexico
en
dc.subject
tectonic evolution
en
dc.subject
upper-mantle
en
dc.subject
oceanic plateaus
en
dc.subject
basalt province
en
dc.subject
reference frame
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.title
The preserved plume of the Caribbean Large Igneous Plateau revealed by 3D data-integrative models
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.doi
10.5194/se-12-275-2021
dcterms.bibliographicCitation.journaltitle
Solid Earth
dcterms.bibliographicCitation.number
1
dcterms.bibliographicCitation.pagestart
275
dcterms.bibliographicCitation.pageend
298
dcterms.bibliographicCitation.volume
12
dcterms.bibliographicCitation.url
https://doi.org/10.5194/se-12-275-2021
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften
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refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1869-9529
refubium.resourceType.provider
WoS-Alert