Pleistocene sediment offloading and the global sulfur cycle
Quaternary sea level fluctuations have greatly affected the sediment budgets of the continental shelves. Previous studies suggested that this caused a considerable increase in the net loss of shelf sediments. Since sediment accumulation and erosion are closely tied to the formation and re-oxidation...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-05-01
|
| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/12/3043/2015/bg-12-3043-2015.pdf |
| _version_ | 1818364957852434432 |
|---|---|
| author | S. Markovic A. Paytan U. G. Wortmann |
| author_facet | S. Markovic A. Paytan U. G. Wortmann |
| author_sort | S. Markovic |
| collection | DOAJ |
| description | Quaternary sea level fluctuations have greatly affected the sediment budgets
of the continental shelves. Previous studies suggested that this caused a
considerable increase in the net loss of shelf sediments. Since sediment
accumulation and erosion are closely tied to the formation and re-oxidation
of pyrite, we use a high-resolution record of sulfur isotope ratios
(<sup>34</sup>S / <sup>32</sup>S) of marine sulfate to evaluate the implications of the
so-called "shelf sediment offloading" on the global sulfur cycle. Modeling of
our δ<sup>34</sup>S record suggests that erosion during sea level
lowstands was only partly compensated by increased sedimentation during
times of rising sea level and sea level highstands. Furthermore, our data
suggests that shelf systems reached a new equilibrium state about
700 ka, which considerably slowed or terminated shelf sediment offloading. |
| first_indexed | 2024-12-13T22:12:38Z |
| format | Article |
| id | doaj.art-f3d0dfcbbeec49cf94decc46cb6960c4 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-13T22:12:38Z |
| publishDate | 2015-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-f3d0dfcbbeec49cf94decc46cb6960c42022-12-21T23:29:41ZengCopernicus PublicationsBiogeosciences1726-41701726-41892015-05-0112103043306010.5194/bg-12-3043-2015Pleistocene sediment offloading and the global sulfur cycleS. Markovic0A. Paytan1U. G. Wortmann2Department of Geology, University of Toronto, 22 Russell St. M5S3B1, Toronto, CanadaInstitute of Marine Sciences, University of California Santa Cruz, Santa Cruz, CA 94064, USADepartment of Geology, University of Toronto, 22 Russell St. M5S3B1, Toronto, CanadaQuaternary sea level fluctuations have greatly affected the sediment budgets of the continental shelves. Previous studies suggested that this caused a considerable increase in the net loss of shelf sediments. Since sediment accumulation and erosion are closely tied to the formation and re-oxidation of pyrite, we use a high-resolution record of sulfur isotope ratios (<sup>34</sup>S / <sup>32</sup>S) of marine sulfate to evaluate the implications of the so-called "shelf sediment offloading" on the global sulfur cycle. Modeling of our δ<sup>34</sup>S record suggests that erosion during sea level lowstands was only partly compensated by increased sedimentation during times of rising sea level and sea level highstands. Furthermore, our data suggests that shelf systems reached a new equilibrium state about 700 ka, which considerably slowed or terminated shelf sediment offloading.http://www.biogeosciences.net/12/3043/2015/bg-12-3043-2015.pdf |
| spellingShingle | S. Markovic A. Paytan U. G. Wortmann Pleistocene sediment offloading and the global sulfur cycle Biogeosciences |
| title | Pleistocene sediment offloading and the global sulfur cycle |
| title_full | Pleistocene sediment offloading and the global sulfur cycle |
| title_fullStr | Pleistocene sediment offloading and the global sulfur cycle |
| title_full_unstemmed | Pleistocene sediment offloading and the global sulfur cycle |
| title_short | Pleistocene sediment offloading and the global sulfur cycle |
| title_sort | pleistocene sediment offloading and the global sulfur cycle |
| url | http://www.biogeosciences.net/12/3043/2015/bg-12-3043-2015.pdf |
| work_keys_str_mv | AT smarkovic pleistocenesedimentoffloadingandtheglobalsulfurcycle AT apaytan pleistocenesedimentoffloadingandtheglobalsulfurcycle AT ugwortmann pleistocenesedimentoffloadingandtheglobalsulfurcycle |