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dc.contributor.authorMerle, Renaud
dc.contributor.authorJourdan, Fred
dc.contributor.authorChiaradia, M.
dc.contributor.authorOlierook, Hugo
dc.contributor.authorManatschal, G.
dc.date.accessioned2019-11-29T06:24:00Z
dc.date.available2019-11-29T06:24:00Z
dc.date.issued2019
dc.identifier.citationMerle, R.E. and Jourdan, F. and Chiaradia, M. and Olierook, H.K.H. and Manatschal, G. 2019. Origin of widespread Cretaceous alkaline magmatism in the Central Atlantic: A single melting anomaly? Lithos. 342-343: pp. 480-498.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/77056
dc.identifier.doi10.1016/j.lithos.2019.06.002
dc.description.abstract

© 2019 Elsevier B.V. The age and origin of the Late Cretaceous magmatism on the North American and Iberian-African margins and the adjacent northern Central and Southern North Atlantic ocean are not well constrained due to the lack of appropriate data. To solve this issue, we used the 40Ar/39Ar geochronology and Sr-Nd-Pb isotopes geochemistry of basalts from the New England Seamounts (NES) and the J-Anomaly Ridge (JAR) as these localities on the North American margin are still poorly investigated. We obtained a reliable age of 82.39 ± 0.12 Ma (2σ) for the Nashville Seamount (NES) and an alteration age of ca. 76 Ma for the JAR. Our new dates from the New England Seamounts, combined with those available from the Tore–Madeira Rise and SW Portugal, on the Iberia–African margins, confirm an overlapping period of activity around 105-80 Ma on both the North American and Iberian-African margins and the adjacent oceanic basins. Plate kinematic reconstructions indicate that these magmatic occurrences were located within a ~1000 km radius within the yet narrow Atlantic Ocean. The J-Anomaly Ridge samples were most likely formed at the mid-Atlantic ridge around ~120 Ma. The Sr-Nd-Pb initial isotopic ratios from the New England seamounts show similarities with the chemical signature of the Tore–Madeira Rise and, to a lesser extent, SW Portugal. Moreover, New England Seamounts display a trend toward EMI isotopic end-member, similar to those documented in at the Late Cretaceous Godzilla seamount on the Tore–Madeira Rise and sills from ODP Site 1276. The shared chemical signature is distributed across a torus-shaped area of ~2000 × 2000 km at a near-fixed location on Earth and is not temporally-controlled, suggesting a large-scale chemical anomaly in the shallow mantle. Therefore, geochronological, geochemical and plate reconstructions imply a large-scale, anomalously fertile mantle source that generated widespread magmatism during the Late Cretaceous in the northern Central Atlantic.

dc.languageEnglish
dc.publisherELSEVIER
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeochemistry & Geophysics
dc.subjectMineralogy
dc.subjectCentral Atlantic Ocean
dc.subjectNew England Seamounts
dc.subjectGeochronology
dc.subjectCretaceous alkaline magmatism
dc.subjectTore-Madeira Rise
dc.subjectTORE-MADEIRA RISE
dc.subjectU-PB AGES
dc.subjectNORTH-ATLANTIC
dc.subjectGEOCHEMICAL EVOLUTION
dc.subjectSEAMOUNT CHAIN
dc.subjectTRACE-ELEMENT
dc.subjectGREAT-METEOR
dc.subjectEASTERN ATLANTIC
dc.subjectOCEANIC BASALTS
dc.subjectHIMU-EM
dc.titleOrigin of widespread Cretaceous alkaline magmatism in the Central Atlantic: A single melting anomaly?
dc.typeJournal Article
dcterms.source.volume342-343
dcterms.source.startPage480
dcterms.source.endPage498
dcterms.source.issn0024-4937
dcterms.source.titleLithos
dc.date.updated2019-11-29T06:23:58Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidJourdan, Fred [0000-0001-5626-4521]
curtin.contributor.orcidOlierook, Hugo [0000-0001-5961-4304]
dcterms.source.eissn1872-6143
curtin.contributor.scopusauthoridJourdan, Fred [10440566700]
curtin.contributor.scopusauthoridMerle, Renaud [14619526100]
curtin.contributor.scopusauthoridOlierook, Hugo [55922674600]
dc.date.embargoEnd2021-06-13


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