OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY)
Oxygen and carbon isotope data of several benthic and planktonic species of Foraminifera from a regressive sequence in northeastern Italy indicate a watermass change during the Late Eocene, In the middle of zone P 16 the Belluno Basin Was temporari/y cut off from the open ocean. This was probably pr...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Milano University Press
2020-05-01
|
| Series: | Rivista Italiana di Paleontologia e Stratigrafia |
| Subjects: | |
| Online Access: | https://riviste.unimi.it/index.php/RIPS/article/view/13429 |
| _version_ | 1797724641976909824 |
|---|---|
| author | HEDI OBERHÄNSLI ANGELA GRÜNIG RENÉ HERB |
| author_facet | HEDI OBERHÄNSLI ANGELA GRÜNIG RENÉ HERB |
| author_sort | HEDI OBERHÄNSLI |
| collection | DOAJ |
| description | Oxygen and carbon isotope data of several benthic and planktonic species of Foraminifera from a regressive sequence in northeastern Italy indicate a watermass change during the Late Eocene, In the middle of zone P 16 the Belluno Basin Was temporari/y cut off from the open ocean. This was probably provoked by 1) worldwide sea—level Iowering during the Late Eocene •and 2) tectonic activity in the relict Tethyan realm and the adjacent areas. The isolation apparently resulted in a temporary salinity increase in the relict basin.
A pronounced oxygen isotope excursion at the base of P 16 could be explained by diagenetic changes. The formation of globular cement in the chambcr cavities of Foraminifera is due either to phreatic water infiltration promoted by the preceding shoaling of the sedimentary environment, or to a temporarily increased geothermal gradient resulting from the volcanic activity in the Colli Euganei.
The genera and species of the superfamily Buliminacea are enriched in 16O relative to the taxa belonging to the superfamily Cassidulinacea. The δ18C of Nodosariacea are mostly intermediate.
The oxygen isotope fractionation of benthic Foraminifera caused by biologica) processes (i.e. vital effect) seems to be somehow related to the wall structure (e.g. systematic classification). |
| first_indexed | 2024-03-12T10:19:58Z |
| format | Article |
| id | doaj.art-be8cc0455ffd45199a52d66c4b157b26 |
| institution | Directory Open Access Journal |
| issn | 0035-6883 2039-4942 |
| language | English |
| last_indexed | 2024-03-12T10:19:58Z |
| publishDate | 2020-05-01 |
| publisher | Milano University Press |
| record_format | Article |
| series | Rivista Italiana di Paleontologia e Stratigrafia |
| spelling | doaj.art-be8cc0455ffd45199a52d66c4b157b262023-09-02T10:14:21ZengMilano University PressRivista Italiana di Paleontologia e Stratigrafia0035-68832039-49422020-05-01893OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY)HEDI OBERHÄNSLI ANGELA GRÜNIG RENÉ HERB Oxygen and carbon isotope data of several benthic and planktonic species of Foraminifera from a regressive sequence in northeastern Italy indicate a watermass change during the Late Eocene, In the middle of zone P 16 the Belluno Basin Was temporari/y cut off from the open ocean. This was probably provoked by 1) worldwide sea—level Iowering during the Late Eocene •and 2) tectonic activity in the relict Tethyan realm and the adjacent areas. The isolation apparently resulted in a temporary salinity increase in the relict basin. A pronounced oxygen isotope excursion at the base of P 16 could be explained by diagenetic changes. The formation of globular cement in the chambcr cavities of Foraminifera is due either to phreatic water infiltration promoted by the preceding shoaling of the sedimentary environment, or to a temporarily increased geothermal gradient resulting from the volcanic activity in the Colli Euganei. The genera and species of the superfamily Buliminacea are enriched in 16O relative to the taxa belonging to the superfamily Cassidulinacea. The δ18C of Nodosariacea are mostly intermediate. The oxygen isotope fractionation of benthic Foraminifera caused by biologica) processes (i.e. vital effect) seems to be somehow related to the wall structure (e.g. systematic classification).https://riviste.unimi.it/index.php/RIPS/article/view/13429Foraminifera; Late Eocene; Northern Italy; Stratigraphy; Oxygen/Carbon isotope; Paleogeography; Paleoecology. |
| spellingShingle | HEDI OBERHÄNSLI ANGELA GRÜNIG RENÉ HERB OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) Rivista Italiana di Paleontologia e Stratigrafia Foraminifera; Late Eocene; Northern Italy; Stratigraphy; Oxygen/Carbon isotope; Paleogeography; Paleoecology. |
| title | OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) |
| title_full | OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) |
| title_fullStr | OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) |
| title_full_unstemmed | OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) |
| title_short | OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY) |
| title_sort | oxygen and carbon isotope study in the late eocene sediments of possagno northern italy |
| topic | Foraminifera; Late Eocene; Northern Italy; Stratigraphy; Oxygen/Carbon isotope; Paleogeography; Paleoecology. |
| url | https://riviste.unimi.it/index.php/RIPS/article/view/13429 |
| work_keys_str_mv | AT hedioberhansli oxygenandcarbonisotopestudyinthelateeocenesedimentsofpossagnonorthernitaly AT angelagrunig oxygenandcarbonisotopestudyinthelateeocenesedimentsofpossagnonorthernitaly AT reneherb oxygenandcarbonisotopestudyinthelateeocenesedimentsofpossagnonorthernitaly |