The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton
This thesis documents sedimentary changes in the middle to late Miocene of the Atlantic and Pacific Ocean basins. This time interval known as the carbonate crash interval (12-9Ma) displays a severe perturbation of the carbonate system in the framework of the major Cenozoic cooling accompanied by cha...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Universität Bremen
2010
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/215 https://nbn-resolving.org/urn:nbn:de:gbv:46-00102323-13 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/215 2023-05-15T17:25:29+02:00 The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton Der Miozäne "Carbonate Crash": Veränderungen in der Karbonaterhaltung und im Beitrag kalkigen Planktons Preiß-Daimler, Inga Henrich, Rüdiger Kuss, Hans-Joachim 2010-10-11 application/pdf https://media.suub.uni-bremen.de/handle/elib/215 https://nbn-resolving.org/urn:nbn:de:gbv:46-00102323-13 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/215 urn:nbn:de:gbv:46-00102323-13 info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) CC-BY Carbonate Crash events carbonate accumulation calcareous silt grain size discoaster morphometry 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2010 ftsubbremen 2022-11-09T07:09:20Z This thesis documents sedimentary changes in the middle to late Miocene of the Atlantic and Pacific Ocean basins. This time interval known as the carbonate crash interval (12-9Ma) displays a severe perturbation of the carbonate system in the framework of the major Cenozoic cooling accompanied by changes in circulation mode, global nutrient shifts, plankton size changes and stratification of the ocean basins. These developments led to modern patterns of biogenic sediment distribution and ecological niches. The main goal of this work was to investigate control mechanisms on Carbonate-Crash-events (CC-events) and to find hints to major discrepancies concerning timing and strength of these events. For this purpose carbonate preservation proxies and carbonate budgets were investigated and evaluated in the Atlantic at the Ceará Rise in a depth transect (ODP sites 926, 927 and 928). The data show that the dissolution occurred in a broad zone between the foraminiferal lysocline at 3300 m depth and the carbonate compensation depth (CCD) at about 4000 m water depth. Detailed mass losses of coccoliths and foraminifer carbonate were calculated among sites. Dissolution is evident throughout the record however preservation seems to increase in correspondence to Northern Component water formation (precursor of North Atlantic Deep water). Productivity decreases of calcareous plankton productivity here (centered at about 9.5 Ma) seem to be as well a factor controlling CC-events during the late Miocene. Furthermore the evaluation of preservation proxies from the coarse calcareous silt fraction (CSmean and CS percent) showed that the fragmentation of foraminifera is probably a more suitable indicator of carbonate dissolution. CSmean and CSpercent did not reproduce the depth dependant carbonate dissolution, which was evident in all other parameters (carbonate content, coarse fraction content, foraminiferal fragmentation). The comparison of Ceará Rise coarse fraction records to Caribbean Site 999 showed in contrast to earlier ... Doctoral or Postdoctoral Thesis North Atlantic Deep Water North Atlantic Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Pacific |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Carbonate Crash events carbonate accumulation calcareous silt grain size discoaster morphometry 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
Carbonate Crash events carbonate accumulation calcareous silt grain size discoaster morphometry 550 550 Earth sciences and geology ddc:550 Preiß-Daimler, Inga The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
topic_facet |
Carbonate Crash events carbonate accumulation calcareous silt grain size discoaster morphometry 550 550 Earth sciences and geology ddc:550 |
description |
This thesis documents sedimentary changes in the middle to late Miocene of the Atlantic and Pacific Ocean basins. This time interval known as the carbonate crash interval (12-9Ma) displays a severe perturbation of the carbonate system in the framework of the major Cenozoic cooling accompanied by changes in circulation mode, global nutrient shifts, plankton size changes and stratification of the ocean basins. These developments led to modern patterns of biogenic sediment distribution and ecological niches. The main goal of this work was to investigate control mechanisms on Carbonate-Crash-events (CC-events) and to find hints to major discrepancies concerning timing and strength of these events. For this purpose carbonate preservation proxies and carbonate budgets were investigated and evaluated in the Atlantic at the Ceará Rise in a depth transect (ODP sites 926, 927 and 928). The data show that the dissolution occurred in a broad zone between the foraminiferal lysocline at 3300 m depth and the carbonate compensation depth (CCD) at about 4000 m water depth. Detailed mass losses of coccoliths and foraminifer carbonate were calculated among sites. Dissolution is evident throughout the record however preservation seems to increase in correspondence to Northern Component water formation (precursor of North Atlantic Deep water). Productivity decreases of calcareous plankton productivity here (centered at about 9.5 Ma) seem to be as well a factor controlling CC-events during the late Miocene. Furthermore the evaluation of preservation proxies from the coarse calcareous silt fraction (CSmean and CS percent) showed that the fragmentation of foraminifera is probably a more suitable indicator of carbonate dissolution. CSmean and CSpercent did not reproduce the depth dependant carbonate dissolution, which was evident in all other parameters (carbonate content, coarse fraction content, foraminiferal fragmentation). The comparison of Ceará Rise coarse fraction records to Caribbean Site 999 showed in contrast to earlier ... |
author2 |
Henrich, Rüdiger Kuss, Hans-Joachim |
format |
Doctoral or Postdoctoral Thesis |
author |
Preiß-Daimler, Inga |
author_facet |
Preiß-Daimler, Inga |
author_sort |
Preiß-Daimler, Inga |
title |
The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
title_short |
The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
title_full |
The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
title_fullStr |
The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
title_full_unstemmed |
The Miocene Carbonate crash: Shifts in carbonate preservation and contribution of calcareous plankton |
title_sort |
miocene carbonate crash: shifts in carbonate preservation and contribution of calcareous plankton |
publisher |
Universität Bremen |
publishDate |
2010 |
url |
https://media.suub.uni-bremen.de/handle/elib/215 https://nbn-resolving.org/urn:nbn:de:gbv:46-00102323-13 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/215 urn:nbn:de:gbv:46-00102323-13 |
op_rights |
info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) |
op_rightsnorm |
CC-BY |
_version_ |
1766116924691841024 |