The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments
The study focuses on the grain-size dependent distribution of particle-reactive, natural radionuclides (230Th, 231Pa, 10Be) in marine sediments from the Southern Ocean, the South East Atlantic, and the Equatorial Pacific. Particle-size specific isotope analyses show that a large amount (53-89 %) of...
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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/41 https://nbn-resolving.org/urn:nbn:de:gbv:46-00101745-16 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/41 2023-05-15T18:24:45+02:00 The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments Der Einfluss von Korngrößenverteilung, Partikelzusammensetzung und Sedimenttransport auf die Verteilung von 230Thxs, 231Paxs und 10Be in Meeressedimenten Kretschmer, Sven Mollenhauer, Gesine Schlüter, Michael 2010-11-05 application/pdf https://media.suub.uni-bremen.de/handle/elib/41 https://nbn-resolving.org/urn:nbn:de:gbv:46-00101745-16 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/41 urn:nbn:de:gbv:46-00101745-16 info:eu-repo/semantics/openAccess protactinium thorium beryllium 231Pa 230Th 10Be particle flux particle tracer biogenic opal grain size distribution sediment transport focusing winnowing 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2010 ftsubbremen 2022-11-09T07:09:17Z The study focuses on the grain-size dependent distribution of particle-reactive, natural radionuclides (230Th, 231Pa, 10Be) in marine sediments from the Southern Ocean, the South East Atlantic, and the Equatorial Pacific. Particle-size specific isotope analyses show that a large amount (53-89 %) of the total 230Th is concentrated in clay-size material. It is discussed to what extent a lateral transport of fine particles could generate a biasing to particle flux calculations based on 230Th. In the Southern Ocean sediment the distribution of 231Pa and 10Be strongly depends on the concentration of biogenic silica of particles. 231Pa/230Th and 10Be/230Th in opal-rich particles largely exceed their production ratio in seawater. This supports the application of bulk 231Pa/230Th as a proxy for past opal fluxes to Southern Ocean sediments. The study of compound-specific 231Pa/230Th and 10Be/230Th, as conducted here, allows a more detailed picture of the origin of the isotopic signatures. Doctoral or Postdoctoral Thesis Southern Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Pacific Southern Ocean |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
protactinium thorium beryllium 231Pa 230Th 10Be particle flux particle tracer biogenic opal grain size distribution sediment transport focusing winnowing 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
protactinium thorium beryllium 231Pa 230Th 10Be particle flux particle tracer biogenic opal grain size distribution sediment transport focusing winnowing 550 550 Earth sciences and geology ddc:550 Kretschmer, Sven The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
topic_facet |
protactinium thorium beryllium 231Pa 230Th 10Be particle flux particle tracer biogenic opal grain size distribution sediment transport focusing winnowing 550 550 Earth sciences and geology ddc:550 |
description |
The study focuses on the grain-size dependent distribution of particle-reactive, natural radionuclides (230Th, 231Pa, 10Be) in marine sediments from the Southern Ocean, the South East Atlantic, and the Equatorial Pacific. Particle-size specific isotope analyses show that a large amount (53-89 %) of the total 230Th is concentrated in clay-size material. It is discussed to what extent a lateral transport of fine particles could generate a biasing to particle flux calculations based on 230Th. In the Southern Ocean sediment the distribution of 231Pa and 10Be strongly depends on the concentration of biogenic silica of particles. 231Pa/230Th and 10Be/230Th in opal-rich particles largely exceed their production ratio in seawater. This supports the application of bulk 231Pa/230Th as a proxy for past opal fluxes to Southern Ocean sediments. The study of compound-specific 231Pa/230Th and 10Be/230Th, as conducted here, allows a more detailed picture of the origin of the isotopic signatures. |
author2 |
Mollenhauer, Gesine Schlüter, Michael |
format |
Doctoral or Postdoctoral Thesis |
author |
Kretschmer, Sven |
author_facet |
Kretschmer, Sven |
author_sort |
Kretschmer, Sven |
title |
The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
title_short |
The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
title_full |
The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
title_fullStr |
The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
title_full_unstemmed |
The Influence of Particle Size, Composition, and Transport on the Distribution of 230Thxs, 231Paxs, and 10Be in Marine Sediments |
title_sort |
influence of particle size, composition, and transport on the distribution of 230thxs, 231paxs, and 10be in marine sediments |
publisher |
Universität Bremen |
publishDate |
2010 |
url |
https://media.suub.uni-bremen.de/handle/elib/41 https://nbn-resolving.org/urn:nbn:de:gbv:46-00101745-16 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/41 urn:nbn:de:gbv:46-00101745-16 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766205617544888320 |