Chemical analysis of ash layers in ODP Leg 104 holes
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...
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1989
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.736965 2023-05-15T16:52:13+02:00 Chemical analysis of ash layers in ODP Leg 104 holes Bitschene, Peter Rene Schmincke, Hans-Ulrich Viereck-Götte, Lothar 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 1989-04-21 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.736965 https://doi.org/10.1594/PANGAEA.736965 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.736965 https://doi.org/10.1594/PANGAEA.736965 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bitschene, Peter Rene; Schmincke, Hans-Ulrich; Viereck-Götte, Lothar (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 104-642B 104-642C 104-643A DRILL Drilling/drill rig Joides Resolution Leg104 Norwegian Sea Ocean Drilling Program ODP Dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.736965 https://doi.org/10.2973/odp.proc.sr.104.129.1989 2023-01-20T07:31:45Z 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. Dataset Iceland Jan Mayen Jan Mayen Island North Atlantic Norwegian Sea PANGAEA - Data Publisher for Earth & Environmental Science Norwegian Sea Jan Mayen Vøring Plateau ENVELOPE(4.000,4.000,67.000,67.000) ENVELOPE(1.033300,2.930000,67.715000,67.220000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
104-642B 104-642C 104-643A DRILL Drilling/drill rig Joides Resolution Leg104 Norwegian Sea Ocean Drilling Program ODP |
spellingShingle |
104-642B 104-642C 104-643A DRILL Drilling/drill rig Joides Resolution Leg104 Norwegian Sea Ocean Drilling Program ODP Bitschene, Peter Rene Schmincke, Hans-Ulrich Viereck-Götte, Lothar Chemical analysis of ash layers in ODP Leg 104 holes |
topic_facet |
104-642B 104-642C 104-643A DRILL Drilling/drill rig Joides Resolution Leg104 Norwegian Sea Ocean Drilling Program ODP |
description |
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. |
format |
Dataset |
author |
Bitschene, Peter Rene Schmincke, Hans-Ulrich Viereck-Götte, Lothar |
author_facet |
Bitschene, Peter Rene Schmincke, Hans-Ulrich Viereck-Götte, Lothar |
author_sort |
Bitschene, Peter Rene |
title |
Chemical analysis of ash layers in ODP Leg 104 holes |
title_short |
Chemical analysis of ash layers in ODP Leg 104 holes |
title_full |
Chemical analysis of ash layers in ODP Leg 104 holes |
title_fullStr |
Chemical analysis of ash layers in ODP Leg 104 holes |
title_full_unstemmed |
Chemical analysis of ash layers in ODP Leg 104 holes |
title_sort |
chemical analysis of ash layers in odp leg 104 holes |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.736965 https://doi.org/10.1594/PANGAEA.736965 |
op_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 |
long_lat |
ENVELOPE(4.000,4.000,67.000,67.000) ENVELOPE(1.033300,2.930000,67.715000,67.220000) |
geographic |
Norwegian Sea Jan Mayen Vøring Plateau |
geographic_facet |
Norwegian Sea Jan Mayen Vøring Plateau |
genre |
Iceland Jan Mayen Jan Mayen Island North Atlantic Norwegian Sea |
genre_facet |
Iceland Jan Mayen Jan Mayen Island North Atlantic Norwegian Sea |
op_source |
Supplement to: Bitschene, Peter Rene; Schmincke, Hans-Ulrich; Viereck-Götte, Lothar (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 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.736965 https://doi.org/10.1594/PANGAEA.736965 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.736965 https://doi.org/10.2973/odp.proc.sr.104.129.1989 |
_version_ |
1766042377704701952 |