Expedition 396 summary

Berndt, Christian; Zarikian, C.A. Alvarez; Agarwal, Amar; Andrews, Graham; Betlem, Peter; Bhattacharya, Joyeeta; Brinkhuis, Henk; Chatterjee, Sayantani; Christopoulou, M.; Clementi, V.J.; Ferré, E.C.; Filina, Irina; Frieling, Joost; Guo, P.; Harper, D. T.; Jones, Morgan T.; Lambart, Sarah; Longman, Jack; Millett, John; Mohn, Geoffroy; Nakaoka, Reina; Scherer, Reed P.; Tegner, Christian; Varela, N.; Wang, Maomao; Xu, Weimu; Yager, S.L.

doi:10.14379/iodp.proc.396.101.2023

Cited by 5 publications

(19 citation statements)

References 149 publications

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“…Units were determined based on macroscopic observations and microscopic analysis and are supported by physical properties and biostratigraphy (see Lithostratigraphy in the Expedition 396 methods chapter [Planke et al, 2023a]). Unit intervals, depths, and descriptions are provided in Table T3.…”

Section: Lithostratigraphymentioning

confidence: 99%

“…Downhole, compositions of the basalts are relatively constant at both sites to the bottom of Hole U1572A and to ~205 m CSF-A in Hole U1571A (i.e., Subunit S7) (Table T4). In Hole U1571A, below Subunit S7, basalt compositions are more variable (Tegner et al, 1998; see Lithostratigraphy in the Expedition 396 methods chapter [Planke et al, 2023a] and Geochemistry for details). 34,11,116,64,0,149,94,33,64,19, 396-U1571B-19X-1, 14, to 20X-1, 58 S1 135.…”

Section: Geochemical Observationsmentioning

confidence: 99%

“…Breaks in the accumulation of sediments are suggested by jumps in biostratigraphic assemblages and represented by thicker black boundary lines in informal age columns. (Tegner et al, 1998; see Lithostratigraphy in the Expedition 396 methods chapter [Planke et al, 2023a] and Geochemistry for details).…”

Section: Lithostratigraphic Correlationmentioning

confidence: 99%

“…In total, 7 core catcher samples from Hole U1572A and 16 from Hole U1572B were processed for palynology, partly guided by results of the smear slide analysis of biosiliceous remains, as for Site U1571. All samples were processed using the standard HF technique (see Biostratigraphy in the Expedition 396 methods chapter [Planke et al, 2023a]). tum, Melitasphaeridium choanophorum, I. lacrymosa, and H. obscura (e.g., Munsterman and Brinkhuis, 2004;Egger et al, 2016;Dybkjaer et al, 2021).…”

Section: Site U1572mentioning

confidence: 99%

“…Hole U1571A and U1571B core catcher samples, the mudline, and areas of interest from workinghalf sections were processed for planktonic foraminifers. Processing samples from Holes U1571A and U1571B followed the methods outlined in Biostratigraphy in the Expedition 396 methods chapter (Planke et al, 2023a). Rose bengal stain was applied to the mudline sample.…”

Section: Site U1571mentioning

confidence: 99%

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Sites U1571 and U1572

Berndt¹,

Zarikian²,

Agarwal³

et al. 2023

Proceedings of the International Ocean Discovery Program

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Section: Lithostratigraphymentioning

confidence: 99%

Section: Geochemical Observationsmentioning

confidence: 99%

Section: Lithostratigraphic Correlationmentioning

confidence: 99%

Section: Site U1572mentioning

confidence: 99%

Section: Site U1571mentioning

confidence: 99%

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Sites U1571 and U1572

Berndt¹,

Zarikian²,

Agarwal³

et al. 2023

Proceedings of the International Ocean Discovery Program

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Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up

Morris,

Lambart,

Stearns

et al. 2024

Geochem Geophys Geosyst

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While basaltic volcanism is dominant during rifting and continental breakup, felsic magmatism may be a significant component of some rift margins. During International Ocean Discovery Program (IODP) Expedition 396 on the continental margin of Norway, a graphite‐garnet‐cordierite bearing dacitic unit (the Mimir dacite) was recovered in two holes within early Eocene sediments on Mimir High (Site U1570), a marginal high on the Vøring Transform Margin. Here, we present a comprehensive textural, petrological, and geochemical study of the Mimir dacite in order to assess its origin and discuss the geodynamic implications. The major mineral phases (garnet, cordierite, quartz, plagioclase, alkali feldspar) are hosted in a fresh rhyolitic, vesicular, glassy matrix that is locally mingled with sediments. The major element chemistry of garnet and cordierite, the presence of zircon inclusions with inherited cores, and thermobarometric calculations all support an upper crustal metapelitic origin. While most magma‐rich margin models favor crustal anatexis in the lower crust, thermobarometric calculations performed here show that the Mimir dacite was produced at upper‐crustal depths (<5 kbar, 18 km depth) and high temperature (750–800°C) with up to 3 wt% water content. In situ U‐Pb analyses on zircon inclusions give a magmatic crystallization age of 54.6 ± 1.1 Ma, consistent with emplacement that post‐dates the Paleocene‐Eocene Thermal Maximum. Our results suggest that the opening of the Northeast Atlantic was associated with a phase of low‐pressure, high‐temperature crustal anatexis preceding the main phase of magmatism.

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Expedition 396 methods

Berndt¹,

Zarikian²,

Agarwal³

et al. 2023

Proceedings of the International Ocean Discovery Program

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publications.iodp.org • 3 known because of the deviation of the pipe below the ship, which can vary depending on water currents, tides, and water depth; the hole position is thus known typically within 10 m accuracy.Drilling sites were numbered according to the series that began with the first site drilled by the D/V Glomar Challenger in 1968. Starting with Integrated Ocean Drilling Program Expedition 301, the prefix "U" designates sites occupied by JOIDES Resolution. When drilling multiple holes at a site, hole locations are typically offset from each other by ~20 m. During Expedition 396, we offset holes at an average of 115 m, except for Site U1570, where holes were offset as far as 1772 m. Site U1570 was approved by EPSP as a 2 km long "ribbon" or transect west of Site U1569 with start and end coordinates. This ribbon provided an alternate coring strategy to Site U1569, where deep stratigraphic targets were outcropping at shallower subseafloor depths. A letter suffix distinguishes each hole drilled at the same site. The first hole drilled is assigned the site number modified by the suffix "A," the second hole takes the site number and the suffix "B," and so forth. During Expedition 396, 21 holes were drilled at 10 sites (U1565-U1574; see Figure F4 in the Expedition 396 summary chapter [Planke et al., 2023a]).

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Expedition 396 summary

Abstract: Introduction 3 Background 6 Scientific objectives 8 Operations and coring strategy 17 Site summaries 45 Preliminary scientific assessment 47 References

Cited by 5 publications

References 149 publications

Sites U1571 and U1572

Sites U1571 and U1572

Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up

Expedition 396 methods

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