Palaeodirectional and palaeointensity results of Paleocene and Eocene basalts from West Greenland

Riisager, Janna; Perrin, Mireille

doi:10.37570/bgsd-1999-46-07

Cited by 10 publications

(1 citation statement)

References 25 publications

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“…There, a 125 m package of picritic flows erupted within a 5 kyr polarity transition period (Pedersen et al., 2002). The WGL data imply brief episodes of volcanism followed by long hiatuses (Pedersen et al., 2002; Riisager & Abrahamsen, 1999; Riisager et al., 1999, 2003b, 2003a). Our data from the PBL probably captured one of these short bursts of activity as well (see Section 5.8).…”

Section: Discussionmentioning

confidence: 99%

Eruption Rates, Tempo, and Stratigraphy of Paleocene Flood Basalts on Baffin Island, Canada

Biasi

Asimow

Horton

et al. 2022

Geochem Geophys Geosyst

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High‐temperature melting in mantle plumes produces voluminous eruptions that are often temporally coincident with mass extinctions. Paleocene Baffin Island lavas—products of early Iceland mantle plume activity—are exceptionally well characterized geochemically but have poorly constrained stratigraphy, geochronology, and eruptive tempos. To provide better geologic context, we measured seven stratigraphic sections of the volcanic deposits and collected paleomagnetic data from 38 sites in the lavas and underlying Cretaceous sediments (Quqaluit Fm.). The average paleomagnetic pole from this study does not overlap with the expected pole for a stable North American locality at 60 Ma, yet the data have sufficient dispersion to average out secular variation. After ruling out other possibilities, we find that the picrites were probably erupted during a polarity transition, over less than 5 kyr. If so, the average eruption interval was ∼67 years per flow for the thickest sequence of exposed lavas. We also calculate that the flood basalts had a minimum total volume of ∼176 km3 (excluding submerged lavas in Baffin Bay). This implies a minimum eruption rate of ∼0.035 km3 yr−1, which is similar to rates found in West Greenland lavas but less than rates found in larger flood basalts. Despite this, the Baffin and West Greenland lavas temporally correlate with the “End C27n event” (a period of ∼2°C global warming) and may be its underlying cause.

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Section: Discussionmentioning

confidence: 99%

Eruption Rates, Tempo, and Stratigraphy of Paleocene Flood Basalts on Baffin Island, Canada

Biasi

Asimow

Horton

et al. 2022

Geochem Geophys Geosyst

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Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

et al. 2015

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Radiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the 40Ar–39Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Maligât Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enriched basalts (Naqerloq Formation). Two local successions comprise 53.5 Ma alkali basalts (Erqua Formation) and 38.7 Ma transitional basalts (Talerua Member). A central volcano developed on Ubekendt Ejland, leading to the Sarqâta qáqâ gabbro-granophyre intrusion at 57–55 Ma. Pre-break-up volcanism took place further south as early as 64–63 Ma. The offshore volcanic succession most probably comprises the known onshore succession plus some younger lavas. The change in spreading direction near the Paleocene–Eocene boundary took place west of the Nuussuaq Basin c. 56.2 Ma. Some tectonomagmatic events are correlatable across the entire North Atlantic Igneous Province. A quiescent 58–56 Ma period correlates with similar periods in East Greenland and the Faroes, and the Naqerloq Formation is coeval with the Eocene basalts in East Greenland. The Paleocene and Eocene tholeiitic basalts are distinguishable chemically; in early Eocene time, mantle typical of the Iceland plume seems to have extended beneath the whole West Greenland margin as well as the central East Greenland margin.

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An Integrated Paleomagnetic, Multimethod‐Paleointensity, and Radiometric Study on Cretaceous and Paleogene Lavas From the Lesser Caucasus: Geomagnetic and Tectonic Implications

Calvo‐Rathert

Bógalo

Morales³

et al. 2021

JGR Solid Earth

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Paleomagnetic and paleointensity data can supply evidence about the past characteristics and fluctuations of the geomagnetic field. Such information provides constraints which contribute to an improved knowledge of the processes taking place in the deep interior of the Earth (e.g., Biggin & Paterson, 2015). When a rock is magnetized in the Earth's magnetic field (EMF), its remanence vector is generally (nearly) parallel to the latter. Thus, information about directional EMF variations can be in principle directly determined

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Palaeodirectional and palaeointensity results of Paleocene and Eocene basalts from West Greenland

Cited by 10 publications

References 25 publications

Eruption Rates, Tempo, and Stratigraphy of Paleocene Flood Basalts on Baffin Island, Canada

Eruption Rates, Tempo, and Stratigraphy of Paleocene Flood Basalts on Baffin Island, Canada

Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

An Integrated Paleomagnetic, Multimethod‐Paleointensity, and Radiometric Study on Cretaceous and Paleogene Lavas From the Lesser Caucasus: Geomagnetic and Tectonic Implications

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