Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis
Highly diverse radiolarian faunas of latest Maastrichtian to early Eocene age have been recovered from the low latitude realm in order to contribute to the clarification of radiolarian taxonomy, construct a zonation based on a discrete sequence of co-existence intervals of species ranging from the l...
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Université de Lausanne, Faculté des géosciences et de l'environnement
2007
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Online Access: | https://serval.unil.ch/notice/serval:BIB_D8B737F9B900 |
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ftunivlausanne:oai:serval.unil.ch:BIB_D8B737F9B900 2024-02-11T10:07:14+01:00 Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis Jackett, S.J. 2007 https://serval.unil.ch/notice/serval:BIB_D8B737F9B900 eng eng Université de Lausanne, Faculté des géosciences et de l'environnement https://serval.unil.ch/notice/serval:BIB_D8B737F9B900 info:eu-repo/semantics/doctoralThesis phdthesis 2007 ftunivlausanne 2024-01-22T00:57:45Z Highly diverse radiolarian faunas of latest Maastrichtian to early Eocene age have been recovered from the low latitude realm in order to contribute to the clarification of radiolarian taxonomy, construct a zonation based on a discrete sequence of co-existence intervals of species ranging from the late Paleocene to early Eocene and to describe a rich low latitude latest Cretaceous to late Paleocene fauna. 225 samples of late Paleocene to early Eocene age have been collected from ODP Leg 171 B-Hole 1051 A (Blake Nose), DSDP Leg 43-Site 384 (Northwest Atlantic) and DSDP Leg 10-Sites 86, 94, 95, 96. Sequences consist of mainly pelagic oozes and chalks, with some clay and ash layers. A new imaging technique is devised to perform (in particular on topotypic material) both transmitted light microscopy and SEM imaging on individual radiolarian specimens. SEM precedes transmitted light imaging. Radiolarians are adhered to a cover slip (using nail varnish) which is secured to a stub using conductive levers. Specimens are then photographed in low vacuum (40-50Pa; 0.5mbar), which enables charge neutralization by ionized molecules of the chamber atmosphere. Thus gold coating is avoided and subsequently this allows transmitted light imaging to follow. The conductive levers are unscrewed and the cover slip is simply overturned and mounted with Canada balsam. In an attempt towards a post-Haeckelian classification, the initial spicule (Entactinaria), micro- or macrosphere (Spumellaria) and initial spicule and cephalis (Nassellaria) have been studied by slicing Entactinaria and Spumellaria, and by tilting Nassellaria in the SEM chamber. A new genus of the family Coccodiscidae is erected and Spongatractus HAECKEL is re-located to the subfamily Axopruinae. The biochronology has been carried out using the Unitary Association Method (Guex 1977, 1991). A database recording the occurrences of 112 species has been used to establish a succession of 22 Unitary Associations. Each association is correlated to chronostratigraphy via ... Doctoral or Postdoctoral Thesis Northwest Atlantic Université de Lausanne (UNIL): Serval - Serveur académique lausannois Canada Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
description |
Highly diverse radiolarian faunas of latest Maastrichtian to early Eocene age have been recovered from the low latitude realm in order to contribute to the clarification of radiolarian taxonomy, construct a zonation based on a discrete sequence of co-existence intervals of species ranging from the late Paleocene to early Eocene and to describe a rich low latitude latest Cretaceous to late Paleocene fauna. 225 samples of late Paleocene to early Eocene age have been collected from ODP Leg 171 B-Hole 1051 A (Blake Nose), DSDP Leg 43-Site 384 (Northwest Atlantic) and DSDP Leg 10-Sites 86, 94, 95, 96. Sequences consist of mainly pelagic oozes and chalks, with some clay and ash layers. A new imaging technique is devised to perform (in particular on topotypic material) both transmitted light microscopy and SEM imaging on individual radiolarian specimens. SEM precedes transmitted light imaging. Radiolarians are adhered to a cover slip (using nail varnish) which is secured to a stub using conductive levers. Specimens are then photographed in low vacuum (40-50Pa; 0.5mbar), which enables charge neutralization by ionized molecules of the chamber atmosphere. Thus gold coating is avoided and subsequently this allows transmitted light imaging to follow. The conductive levers are unscrewed and the cover slip is simply overturned and mounted with Canada balsam. In an attempt towards a post-Haeckelian classification, the initial spicule (Entactinaria), micro- or macrosphere (Spumellaria) and initial spicule and cephalis (Nassellaria) have been studied by slicing Entactinaria and Spumellaria, and by tilting Nassellaria in the SEM chamber. A new genus of the family Coccodiscidae is erected and Spongatractus HAECKEL is re-located to the subfamily Axopruinae. The biochronology has been carried out using the Unitary Association Method (Guex 1977, 1991). A database recording the occurrences of 112 species has been used to establish a succession of 22 Unitary Associations. Each association is correlated to chronostratigraphy via ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Jackett, S.J. |
spellingShingle |
Jackett, S.J. Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
author_facet |
Jackett, S.J. |
author_sort |
Jackett, S.J. |
title |
Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
title_short |
Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
title_full |
Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
title_fullStr |
Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
title_full_unstemmed |
Low latitude Paleocene to early Eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
title_sort |
low latitude paleocene to early eocene radiolarian systematics, biochronology and paleoenvironmental analysis |
publisher |
Université de Lausanne, Faculté des géosciences et de l'environnement |
publishDate |
2007 |
url |
https://serval.unil.ch/notice/serval:BIB_D8B737F9B900 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Canada Tilting |
geographic_facet |
Canada Tilting |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
https://serval.unil.ch/notice/serval:BIB_D8B737F9B900 |
_version_ |
1790605416309194752 |