Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica
Author Posting. © Elsevier B.V., 2007. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 38 (2007): 128-139, doi:10.1016/j.orggeochem.2006.08.003. Samp...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/2035 2023-05-15T13:53:14+02:00 Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica Sinninghe Damste, Jaap S. Rijpstra, W. Irene C. Coolen, Marco J. L. Schouten, Stefan Volkman, John K. 2006-04-03 application/pdf https://hdl.handle.net/1912/2035 en_US eng https://doi.org/10.1016/j.orggeochem.2006.08.003 https://hdl.handle.net/1912/2035 Diatoms Thiane Euxinic conditions Sediment diagenesis Kinetics Preprint 2006 ftwhoas https://doi.org/10.1016/j.orggeochem.2006.08.003 2022-05-28T22:57:26Z Author Posting. © Elsevier B.V., 2007. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 38 (2007): 128-139, doi:10.1016/j.orggeochem.2006.08.003. Samples of particulate organic matter from the water column and anoxic Holocene sediment layers from the Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) were analyzed to study the early incorporation of reduced inorganic sulfur species into highly branched isoprenoid (HBI) alkenes. HBIs were not detected in the water column samples from austral winter, whereas compounds containing the C25 HBI skeleton were abundant in all analyzed Holocene sediment layers. The structure of the C25:2 HBI alkene together with its enriched stable carbon isotopic composition suggest that the HBI alkene is produced by a diatom or diatoms probably belonging to the Navicula genus present in the sea-ice which covers the area most of the year. Within just 500 years of deposition, all of the HBI alkene was sulfurised. A mixture of products was formed, including components tentatively identified as a C25 HBI thiane and three S-containing dimers composed of two C25:1 HBI skeletons linked together by a sulfide bond. Most of the HBI alkene, however, was converted to polar S-containing compounds. The observed reaction rate for sulfurisation the C25:2 HBI alkene is the highest observed so far in natural systems. Sterols and other lipids known to be prone to sulfurisation were only minimally sulfurised under these depositional conditions. The reason for this is presently unclear. Funding for the collection of the sediment and water samples (by MJLC and CW) was provided by ASAC grant 1166 to JKV. This work was further supported by a grant from the Netherlands Organization for Scientific Research (NWO; Netherlands Antarctic Research Proposals 851.20.006 to JSSD). Report Antarc* Antarctic Antarctica Sea ice Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Austral Ellis Fjord ENVELOPE(78.132,78.132,-68.603,-68.603) Organic Geochemistry 38 1 128 139 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Diatoms Thiane Euxinic conditions Sediment diagenesis Kinetics |
spellingShingle |
Diatoms Thiane Euxinic conditions Sediment diagenesis Kinetics Sinninghe Damste, Jaap S. Rijpstra, W. Irene C. Coolen, Marco J. L. Schouten, Stefan Volkman, John K. Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
topic_facet |
Diatoms Thiane Euxinic conditions Sediment diagenesis Kinetics |
description |
Author Posting. © Elsevier B.V., 2007. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 38 (2007): 128-139, doi:10.1016/j.orggeochem.2006.08.003. Samples of particulate organic matter from the water column and anoxic Holocene sediment layers from the Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) were analyzed to study the early incorporation of reduced inorganic sulfur species into highly branched isoprenoid (HBI) alkenes. HBIs were not detected in the water column samples from austral winter, whereas compounds containing the C25 HBI skeleton were abundant in all analyzed Holocene sediment layers. The structure of the C25:2 HBI alkene together with its enriched stable carbon isotopic composition suggest that the HBI alkene is produced by a diatom or diatoms probably belonging to the Navicula genus present in the sea-ice which covers the area most of the year. Within just 500 years of deposition, all of the HBI alkene was sulfurised. A mixture of products was formed, including components tentatively identified as a C25 HBI thiane and three S-containing dimers composed of two C25:1 HBI skeletons linked together by a sulfide bond. Most of the HBI alkene, however, was converted to polar S-containing compounds. The observed reaction rate for sulfurisation the C25:2 HBI alkene is the highest observed so far in natural systems. Sterols and other lipids known to be prone to sulfurisation were only minimally sulfurised under these depositional conditions. The reason for this is presently unclear. Funding for the collection of the sediment and water samples (by MJLC and CW) was provided by ASAC grant 1166 to JKV. This work was further supported by a grant from the Netherlands Organization for Scientific Research (NWO; Netherlands Antarctic Research Proposals 851.20.006 to JSSD). |
format |
Report |
author |
Sinninghe Damste, Jaap S. Rijpstra, W. Irene C. Coolen, Marco J. L. Schouten, Stefan Volkman, John K. |
author_facet |
Sinninghe Damste, Jaap S. Rijpstra, W. Irene C. Coolen, Marco J. L. Schouten, Stefan Volkman, John K. |
author_sort |
Sinninghe Damste, Jaap S. |
title |
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
title_short |
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
title_full |
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
title_fullStr |
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
title_full_unstemmed |
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica |
title_sort |
rapid sulfurisation of highly branched isoprenoid (hbi) alkenes in sulfidic holocene sediments from ellis fjord, antarctica |
publishDate |
2006 |
url |
https://hdl.handle.net/1912/2035 |
long_lat |
ENVELOPE(78.132,78.132,-68.603,-68.603) |
geographic |
Antarctic Austral Ellis Fjord |
geographic_facet |
Antarctic Austral Ellis Fjord |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_relation |
https://doi.org/10.1016/j.orggeochem.2006.08.003 https://hdl.handle.net/1912/2035 |
op_doi |
https://doi.org/10.1016/j.orggeochem.2006.08.003 |
container_title |
Organic Geochemistry |
container_volume |
38 |
container_issue |
1 |
container_start_page |
128 |
op_container_end_page |
139 |
_version_ |
1766258217528066048 |