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Bitschene, Peter Rene; Schmincke, Hans-Ulrich; Viereck-Götte, Lothar (1989): Chemical analysis of ash layers in ODP Leg 104 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.736965, Supplement to: Bitschene, PR et al. (1989): Cenozoic ash layers on the Vøring Plateau (ODP Leg 104). In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 357-366, https://doi.org/10.2973/odp.proc.sr.104.129.1989

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Abstract:
Numerous fresh ash layers comprise about 0.3% by volume of Neogene to Holocene sediments drilled at Leg 104 Sites 642 and 643 (Vøring Plateau, North Atlantic). Median grain sizes of the ashes are about 100 /µm and maximum grain sizes range up to 1200 µm. Rhyolitic pumice shards dominate, with minor bubble wall shards. Basaltic shards are poorly vesicular and blocky or round. Phenocrystic plagioclase, zircon, and clinopyroxene occur in the rhyolitic, plagioclase, and clinopyroxene phenocrysts and basaltic lithics in the basaltic tephra. Quartz, amphibole, clinozoisite, and rutile are interpreted as xenocrysts. All ash layers are well-sorted and represent distal fallout from major explosive eruptions. Most ashes are rhyolitic (high-K and low-K) in composition, some are bimodal (tholeiitic and rhyolitic). Early Miocene tephra is dominantly basaltic.
Iceland is inferred to be the likely source region for most ashes. Late Miocene high-K rhyolites may have originated from the K-rich Jan Mayen magmatic province. One Quaternary layer with biotite and alkali feldspar phenocrysts may have been derived from Jan Mayen Island. Four individual Pliocene to Holocene ash layers from Sites 642 and 643 can be correlated fairly well. Upper Miocene layers are tentatively correlated as a sequence between Sites 642 and 643.
Average calculated layer frequencies are about three layers/m.y. through the Pliocene and Pleistocene and five to eight layers per m.y. through the middle and late Miocene, suggesting rather continuous volcanic activity in the North Atlantic. Episodic magmatic activity during Neogene epochs in this part of the North Atlantic, as postulated in the literature, cannot be confirmed.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 67.457556 * Median Longitude: 2.023440 * South-bound Latitude: 67.220000 * West-bound Longitude: 1.033300 * North-bound Latitude: 67.715000 * East-bound Longitude: 2.930000
Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-08-08T01:45:00
Event(s):
104-642B * Latitude: 67.225000 * Longitude: 2.928300 * Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-06-29T20:15:00 * Elevation: -1294.0 m * Penetration: 221.1 m * Recovery: 214.61 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 221.1 m cored; 0 m drilled; 97.1 % recovery
104-642C * Latitude: 67.220000 * Longitude: 2.930000 * Date/Time Start: 1985-06-29T20:15:00 * Date/Time End: 1985-07-01T15:00:00 * Elevation: -1292.0 m * Penetration: 199.6 m * Recovery: 194.93 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 199.6 m cored; 0 m drilled; 97.7 % recovery
104-643A * Latitude: 67.715000 * Longitude: 1.033300 * Date/Time Start: 1985-08-03T06:07:00 * Date/Time End: 1985-08-08T01:45:00 * Elevation: -2780.0 m * Penetration: 565.2 m * Recovery: 458.29 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 565.2 m cored; 0 m drilled; 81.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Bitschene, PR; Schmincke, H-U; Viereck-Götte, L (1989): (Table 1) Chemical composition of rhyolithic ash in ODP Site 104-642 and Hole 104-643A. https://doi.org/10.1594/PANGAEA.736962
  2. Bitschene, PR; Schmincke, H-U; Viereck-Götte, L (1989): (Table 2) Chemical composition of glass shards from ODP Site 104-642 and Hole 104-643A. https://doi.org/10.1594/PANGAEA.736963
  3. Bitschene, PR; Schmincke, H-U; Viereck-Götte, L (1989): (Table 3) Chemical composition of single plagioclase from ODP Holes 104-642B and Hole 104-643A. https://doi.org/10.1594/PANGAEA.736964