Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian
At Montagna della Maiella and at Gola del Furlo (central Apennines) two discrete layers of bentonic clay are intercalated within the pelagic (Furlo) and turbiditic/ pelagic limestones (Maiella) of the Upper Cretaceous basinal succession of the Umbrian basin (Scaglia facies). The bentonite layers are...
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ftunivgeneve:oai:unige.ch:aou:unige:28483 2023-10-01T03:59:01+02:00 Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian Bernoulli, Daniel Schaltegger, Urs Stern, Willem B. Frey, Martin Caron, Michèle Monechi, Simonetta 2004 https://archive-ouverte.unige.ch/unige:28483 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-004-0389-4 https://archive-ouverte.unige.ch/unige:28483 unige:28483 info:eu-repo/semantics/restrictedAccess ISSN: 1437-3254 International journal of earth sciences, vol. 93, no. 3 (2004) p. 384-399 info:eu-repo/classification/ddc/550 Apennines Bentonite Biostratigraphy Geochronology U/pb age Zircon info:eu-repo/semantics/article Text Article scientifique info:eu-repo/semantics/publishedVersion 2004 ftunivgeneve https://doi.org/10.1007/s00531-004-0389-4 2023-09-07T07:08:14Z At Montagna della Maiella and at Gola del Furlo (central Apennines) two discrete layers of bentonic clay are intercalated within the pelagic (Furlo) and turbiditic/ pelagic limestones (Maiella) of the Upper Cretaceous basinal succession of the Umbrian basin (Scaglia facies). The bentonite layers are dated by planktonic foraminifera to the Globotruncanita elevata zone, early Campanian, and by calcareous nannofossils to the Aspidolithus parcus zone (CC 18); they fall into the reversed interval of chron 33. Detailed correlation shows the layers to be of exactly the same age. The upper layer is dated by U/Pb on magmatic zircons to 81.67€0.21 Ma, an age compatible with the Cretaceous time-scale of Obradovich. The mineralogy of the bentonitic clays is almost pure montmorillonite and contrasts sharply with the clay mineral assemblage of the enclosing pelagic and turbiditic limestones, which is dominated by soil-derived smectite and illite in different proportions. The bentonite seams are interpreted as the submarine alteration products of wind-borne volcanic ashes. They can be followed with only minor changes in thickness over 200 km and must be derived from distant volcanic sources and related to extreme volcanic events. A possible source area is present in the Dinarides where Upper Cretaceous subduction-related magmatic rocks are widespread Article in Journal/Newspaper Planktonic foraminifera Université de Genève: Archive ouverte UNIGE International Journal of Earth Sciences 93 3 384 399 |
institution |
Open Polar |
collection |
Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Apennines Bentonite Biostratigraphy Geochronology U/pb age Zircon |
spellingShingle |
info:eu-repo/classification/ddc/550 Apennines Bentonite Biostratigraphy Geochronology U/pb age Zircon Bernoulli, Daniel Schaltegger, Urs Stern, Willem B. Frey, Martin Caron, Michèle Monechi, Simonetta Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
topic_facet |
info:eu-repo/classification/ddc/550 Apennines Bentonite Biostratigraphy Geochronology U/pb age Zircon |
description |
At Montagna della Maiella and at Gola del Furlo (central Apennines) two discrete layers of bentonic clay are intercalated within the pelagic (Furlo) and turbiditic/ pelagic limestones (Maiella) of the Upper Cretaceous basinal succession of the Umbrian basin (Scaglia facies). The bentonite layers are dated by planktonic foraminifera to the Globotruncanita elevata zone, early Campanian, and by calcareous nannofossils to the Aspidolithus parcus zone (CC 18); they fall into the reversed interval of chron 33. Detailed correlation shows the layers to be of exactly the same age. The upper layer is dated by U/Pb on magmatic zircons to 81.67€0.21 Ma, an age compatible with the Cretaceous time-scale of Obradovich. The mineralogy of the bentonitic clays is almost pure montmorillonite and contrasts sharply with the clay mineral assemblage of the enclosing pelagic and turbiditic limestones, which is dominated by soil-derived smectite and illite in different proportions. The bentonite seams are interpreted as the submarine alteration products of wind-borne volcanic ashes. They can be followed with only minor changes in thickness over 200 km and must be derived from distant volcanic sources and related to extreme volcanic events. A possible source area is present in the Dinarides where Upper Cretaceous subduction-related magmatic rocks are widespread |
format |
Article in Journal/Newspaper |
author |
Bernoulli, Daniel Schaltegger, Urs Stern, Willem B. Frey, Martin Caron, Michèle Monechi, Simonetta |
author_facet |
Bernoulli, Daniel Schaltegger, Urs Stern, Willem B. Frey, Martin Caron, Michèle Monechi, Simonetta |
author_sort |
Bernoulli, Daniel |
title |
Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
title_short |
Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
title_full |
Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
title_fullStr |
Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
title_full_unstemmed |
Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian |
title_sort |
volcanic ash layers in the upper cretaceous of the central apennines and a numerical age for the early campanian |
publishDate |
2004 |
url |
https://archive-ouverte.unige.ch/unige:28483 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 1437-3254 International journal of earth sciences, vol. 93, no. 3 (2004) p. 384-399 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-004-0389-4 https://archive-ouverte.unige.ch/unige:28483 unige:28483 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00531-004-0389-4 |
container_title |
International Journal of Earth Sciences |
container_volume |
93 |
container_issue |
3 |
container_start_page |
384 |
op_container_end_page |
399 |
_version_ |
1778532418213380096 |