New paleomagnetic pole and magnetostratigraphy of Faroe Islands flood volcanics, North Atlantic igneous province

Riisager, Peter; Riisager, Janna; Abrahamsen, Niels; Waagstein, Regin

doi:10.1016/s0012-821x(02)00720-3

Cited by 57 publications

(73 citation statements)

References 41 publications

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“…[25] A paleogeographic reinterpretation, based upon a new pole from the Faeroe Islands [Riisager et al, 2002], indicates that the magnetofossil-rich sediments were deposited at subtropical latitudes along a southward facing portion of the eastern margin of North America. On the basis of work linking magnetofossil populations and Quaternary climate change, we suggest that the unusual magnetic character of the sediments is the result of enhanced sedimentary suboxia during the PETM, driven by some combination of increased sediment accumulation rate, changes in biological productivity, higher temperatures, and changes in ocean circulation along the continental margin.…”

Section: Resultsmentioning

confidence: 99%

“…[10] A relatively new, high-quality paleomagnetic pole from Faeroe Islands flood volcanics [Riisager et al, 2002], effectively coincident with the $55.6 Ma PETM [Storey et al, 2007], yields a paleolatitude of $27.3°at Ancora, New Jersey. This paleolatitude is well within the modern and ancient evaporite belt ($15°-35°) [Evans, 2006] and consistent with suggestions of a regional land surface devoid of terrestrial vegetation .…”

Section: Paleogeographic Settingmentioning

confidence: 99%

“…[11] To our knowledge, this Faeroe Islands pole has not previously been applied to the PETM, though Riisager et al [2002] argue that it should supersede prior North Atlantic Igneous Province results, upon which most PaleoceneEocene paleogeographies are based. The resulting paleolatitude is $6°-9°lower than in conventional reconstructions (auxiliary material Table S3), and the derived shoreline trace is more zonal.…”

Section: Paleogeographic Settingmentioning

confidence: 99%

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Magnetofossil spike during the Paleocene‐Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New Jersey, United States

et al. 2007

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Previous workers identified a magnetically anomalous clay layer deposited on the northern United States Atlantic Coastal Plain during the Paleocene‐Eocene thermal maximum (PETM). The finding inspired the highly controversial hypothesis that a cometary impact triggered the PETM. Here we present ferromagnetic resonance (FMR), isothermal and anhysteretic remanent magnetization, first‐order reversal curve, and transmission electron microscopy analyses of late Paleocene and early Eocene sediments in drill core from Ancora, New Jersey. A novel paleogeographic analysis applying a recent paleomagnetic pole from the Faeroe Islands indicates that New Jersey during the initial Eocene had a ∼6°–9° lower paleolatitude (∼27.3° for Ancora) and a more zonal shoreline trace than in conventional reconstructions. Our investigations of the PETM clay from Ancora reveal abundant magnetite nanoparticles bearing signature traits of crystals produced by magnetotactic bacteria. This result, the first identification of ancient biogenic magnetite using FMR, argues that the anomalous magnetic properties of the PETM sediments are not produced by an impact. They instead reflect environmental changes along the eastern margin of North America during the PETM that led to enhanced production and/or preservation of magnetofossils.

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Section: Resultsmentioning

confidence: 99%

Section: Paleogeographic Settingmentioning

confidence: 99%

Section: Paleogeographic Settingmentioning

confidence: 99%

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Magnetofossil spike during the Paleocene‐Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New Jersey, United States

et al. 2007

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“…1; Larsen et al 1999). Apart from the classic study of Noe-Nygaard (1969, 1970), which was based on field observations made during the period 1940-1970, most recent studies of the onshore FIBG have concentrated on the geochemistry of the lavas (Gariépy et al 1983;Hald and Waagstein 1983;Waagstein 1988) and their geochronology (Riisager et al 2002;Waagstein et al 2002). However, this somewhat neglected part of the North Atlantic Igneous Province (NAIP) preserves a spectacular record of eruption mechanisms through its various lava flow morphologies, and provides data concerning the architecture and growth of CFBs, in general.…”

Section: Introductionmentioning

confidence: 99%

Morphologies and emplacement mechanisms of the lava flows of the Faroe Islands Basalt Group, Faroe Islands, NE Atlantic Ocean

2007

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The Palaeogene Faroe Islands Basalt Group (FIBG) comprises three eruptive sequences or formations, all emplaced into a subaerial environment during the development of the extensive continental flood basalt province that stretches from East Greenland through the Faroe Islands and into the Faroe-Shetland Basin. The Beinisvørð Formation, having a tabular-classic facies architecture, is composed of a sequence of simple flows each comprising a single sheet lobe. The Beinisvørð Formation is overlain by the distinctly contrasting Malinstindur Formation that has a compound-braided facies architecture. The Enni Formation occurs at the top of the sequence and consists of a mixture of simple and compound flows with tabular-classic and compound-braided facies architectures, respectively. Surface and internal characteristics of the sheet lobes of the Beinisvørð and Enni formations indicate emplacement through inflation, which is more obvious for the tube-fed compound flows of the Malinstindur and Enni formations. The difference between the simple and compound flow sequences of the FIBG is, most likely, linked to the manner in which the lava was supplied during the eruption and the eruptive style of the volcanic system. The sheet lobes were erupted over laterally extensive areas from fissure systems which had a continuous supply of lava, which contrasts with the tube-fed compound flows which were erupted in a gradual, piecemeal manner from pointsourced, low shield volcanoes with limited areal extents.

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“…An indication that the existing Paleogene reference poles may need a minor revision has been proffered by the work of Riisager et al (2002) on the Faroe Islands flood volcanics. They obtained a Cenozoic paleopole for the European plate (55-58 Ma) at 71°N/155°E, which when rotated into African coordinates results in a pole at 71°N/176°E (Table 5) with a predicted direction at Fayum of Dec./Inc.…”

Section: Comparison With Poles and Directions Rotated From The Othermentioning

confidence: 99%

Tropical northeast Africa in the middle–late Eocene: Paleomagnetism of the marine-mammals sites and basalts in the Fayum province, Egypt

Lotfy¹,

Voo²

2007

Journal of African Earth Sciences

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New paleomagnetic pole and magnetostratigraphy of Faroe Islands flood volcanics, North Atlantic igneous province

Cited by 57 publications

References 41 publications

Magnetofossil spike during the Paleocene‐Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New Jersey, United States

Magnetofossil spike during the Paleocene‐Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New Jersey, United States

Morphologies and emplacement mechanisms of the lava flows of the Faroe Islands Basalt Group, Faroe Islands, NE Atlantic Ocean

Tropical northeast Africa in the middle–late Eocene: Paleomagnetism of the marine-mammals sites and basalts in the Fayum province, Egypt

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