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The Greenhouse - Icehouse Transition: a dinoflagellate perspective
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Through the analysis of the stratigraphic and spatial distribution of organic walled dinoflagellate cysts (dinocysts) from climatologically and oceanographically key sites, this project aims to contribute to a better understanding of the Eocene-Oligocene (E/O) environmental changes and their timing. A central issue is to identify the global environmental changes which are responsible for the Eocene cooling and its underlying mechanisms with the focus on the Oligocene isotope-1 (Oi-1) event, thought to mark the onset of major Antarctic glaciation.

Two low-latitude sites were selected, Blake Nose (western North Atlantic) and Massignano (central Italy). For the first time a coherent taxonomy and biostratigraphy of dinocysts was established for the late Eocene at these latitudes. A high resolution correlation was established between the Massignano E/O Stratotype Section and the stratigraphically more extended ‘Massicore’. The composite section was used to analyse sea surface temperature (SST) change across the greenhouse-icehouse transition by means of dinocyst distribution.

At Massignano, the Oi-1 event was recognised both qualitatively and quantitatively. In the power spectrum of the SSTdino the ~100 and ~400 kyr eccentricity cycles may be distinguished and correlated with La04. When orbitally tuned, the E/O GSSP dates ~100 kyr older than the Oi-1 event. The boundary’s age could either be ~33.75 or ~34.1 Ma, both differ significantly from the ~33.9 Ma age in the GTS 2004.

Furthermore, when the data from the low-latitude sites were combined with extensive datasets from the Proto North Atlantic and adjacent regions, a suite of species sensitive to changes in SST was recognised. Their first and last occurrences reflect seven distinct phases of decreasing SSTs during the Middle Eocene to earliest Oligocene.

These results clearly indicate that atmospheric cooling together with higher frequency orbital forcing played a key role in the transition from the Greenhouse to the Icehouse world.

Place, publisher, year, edition, pages
Stockholm: Institutionen för geologi och geokemi , 2006. , 32 p.
Series
Meddelanden från Stockholms universitets institution för geologi och geokemi, ISSN 1101-1599 ; 1101-1599
Keyword [en]
Eocene - Oligocene, dinoflagellate cysts, biostratigraphy, paleoecology
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-1073ISBN: 91-7155-227-8 (print)OAI: oai:DiVA.org:su-1073DiVA: diva2:189370
Public defence
2006-06-20, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 13:00
Opponent
Supervisors
Available from: 2006-05-30 Created: 2006-05-30Bibliographically approved
List of papers
1. Mid- to Late Eocene organic-walled dinoflagellate cysts from ODP Leg 171B, offshore Florida.
Open this publication in new window or tab >>Mid- to Late Eocene organic-walled dinoflagellate cysts from ODP Leg 171B, offshore Florida.
2001 In: Western North Atlantic Paleogene and Cretaceous Paleoceanography., 2001, 225-252 p.Chapter in book (Other academic) Published
Identifiers
urn:nbn:se:su:diva-22751 (URN)
Note
Part of urn:nbn:se:su:diva-1073Available from: 2006-05-30 Created: 2006-05-30Bibliographically approved
2. The Massignano Eocene-Oligocene golden spike section
Open this publication in new window or tab >>The Massignano Eocene-Oligocene golden spike section
2005 In: Stratigraphy, ISSN 1547-139X, Vol. 2, no 1, 13-30 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22752 (URN)
Note
Part of urn:nbn:se:su:diva-1073Available from: 2006-05-30 Created: 2006-05-30Bibliographically approved
3. Dinoflagellate evidence for Northern Hemisphere Eocene sea surface water-cooling phases
Open this publication in new window or tab >>Dinoflagellate evidence for Northern Hemisphere Eocene sea surface water-cooling phases
Show others...
In: Marine Micropaleontology, ISSN 0377-8398Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-22753 (URN)
Note
Part of urn:nbn:se:su:diva-1073Available from: 2006-05-30 Created: 2006-05-30Bibliographically approved
4. From Greenhouse to Icehouse at the Massignano Eocene - Oligocene GSSP;: implications for the cause, timing and effects of the Oi-1 glaciation.
Open this publication in new window or tab >>From Greenhouse to Icehouse at the Massignano Eocene - Oligocene GSSP;: implications for the cause, timing and effects of the Oi-1 glaciation.
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Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-22754 (URN)
Note
Part of urn:nbn:se:su:diva-1073Available from: 2006-05-30 Created: 2006-05-30 Last updated: 2010-01-13Bibliographically approved

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