Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area
Methane seepage leads to Mg-calcite and aragonite precipitation at a depth of 4,850 m on the Aleutian accretionary margin. Stromatolitic and oncoid growth structures imply encrustation of microorganisms (microbial mats) in the host sediment with a unique growth direction downward into the sediment,...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2002
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.767424 https://doi.org/10.1594/PANGAEA.767424 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.767424 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.767424 2023-05-15T17:04:42+02:00 Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area Greinert, Jens Bohrmann, Gerhard Elvert, Marcus MEDIAN LATITUDE: 54.302290 * MEDIAN LONGITUDE: -157.200417 * SOUTH-BOUND LATITUDE: 54.299667 * WEST-BOUND LONGITUDE: -157.212500 * NORTH-BOUND LATITUDE: 54.303833 * EAST-BOUND LONGITUDE: -157.195167 * DATE/TIME START: 1994-08-17T05:22:00 * DATE/TIME END: 1996-08-02T16:34:00 2002-08-26 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.767424 https://doi.org/10.1594/PANGAEA.767424 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.767424 https://doi.org/10.1594/PANGAEA.767424 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Greinert, Jens; Bohrmann, Gerhard; Elvert, Marcus (2002): Stromatolitic fabric of authigenic carbonate crusts. Results of anaerobic methane oxidation at cold seeps in 4850m water depth. International Journal of Earth Sciences, 91, 698-711, https://doi.org/10.1007/s00531-001-0244-9 40-1 Alaska USA Giant box corer GKG KODIAK-VENT SO110/1b SO110/1b_40-1 SO97/1 SO97/1_97 Sonne SO-RO Television-Grab TVG Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.767424 https://doi.org/10.1007/s00531-001-0244-9 2023-01-20T07:32:17Z Methane seepage leads to Mg-calcite and aragonite precipitation at a depth of 4,850 m on the Aleutian accretionary margin. Stromatolitic and oncoid growth structures imply encrustation of microorganisms (microbial mats) in the host sediment with a unique growth direction downward into the sediment, forming crust-shaped lithologies. Biomarker investigations of the residue after carbonate dissolution show strong enrichments in crocetane and archaeol, which contain extremely low d13C values. This indicates the presence of methane-consuming archaea, and d13C values of -42 to -51 per mill PDB indicate that methane is the carbon source for the carbonate crusts. Thus, it appears that stromatolitic encrustations of methanotrophic anaerobic archaea probably occurs in a consortium with sulphate-reducing bacteria and that carbonate precipitation proceeds downward into the sediment, where ascending cold fluids provide a methane source. Strontium and oxygen isotope analyses as well as 14C ages of the carbonates suggest that the fluids come from deep within the sediment and that carbonate precipitation began about 3,000 years ago. Dataset Kodiak Alaska PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-157.212500,-157.195167,54.303833,54.299667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
40-1 Alaska USA Giant box corer GKG KODIAK-VENT SO110/1b SO110/1b_40-1 SO97/1 SO97/1_97 Sonne SO-RO Television-Grab TVG |
spellingShingle |
40-1 Alaska USA Giant box corer GKG KODIAK-VENT SO110/1b SO110/1b_40-1 SO97/1 SO97/1_97 Sonne SO-RO Television-Grab TVG Greinert, Jens Bohrmann, Gerhard Elvert, Marcus Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
topic_facet |
40-1 Alaska USA Giant box corer GKG KODIAK-VENT SO110/1b SO110/1b_40-1 SO97/1 SO97/1_97 Sonne SO-RO Television-Grab TVG |
description |
Methane seepage leads to Mg-calcite and aragonite precipitation at a depth of 4,850 m on the Aleutian accretionary margin. Stromatolitic and oncoid growth structures imply encrustation of microorganisms (microbial mats) in the host sediment with a unique growth direction downward into the sediment, forming crust-shaped lithologies. Biomarker investigations of the residue after carbonate dissolution show strong enrichments in crocetane and archaeol, which contain extremely low d13C values. This indicates the presence of methane-consuming archaea, and d13C values of -42 to -51 per mill PDB indicate that methane is the carbon source for the carbonate crusts. Thus, it appears that stromatolitic encrustations of methanotrophic anaerobic archaea probably occurs in a consortium with sulphate-reducing bacteria and that carbonate precipitation proceeds downward into the sediment, where ascending cold fluids provide a methane source. Strontium and oxygen isotope analyses as well as 14C ages of the carbonates suggest that the fluids come from deep within the sediment and that carbonate precipitation began about 3,000 years ago. |
format |
Dataset |
author |
Greinert, Jens Bohrmann, Gerhard Elvert, Marcus |
author_facet |
Greinert, Jens Bohrmann, Gerhard Elvert, Marcus |
author_sort |
Greinert, Jens |
title |
Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
title_short |
Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
title_full |
Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
title_fullStr |
Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
title_full_unstemmed |
Carbonate mineralogical and isotopic analyses of TV-guided grab samples and TV-guided box corer samples from the Shumagin area |
title_sort |
carbonate mineralogical and isotopic analyses of tv-guided grab samples and tv-guided box corer samples from the shumagin area |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.767424 https://doi.org/10.1594/PANGAEA.767424 |
op_coverage |
MEDIAN LATITUDE: 54.302290 * MEDIAN LONGITUDE: -157.200417 * SOUTH-BOUND LATITUDE: 54.299667 * WEST-BOUND LONGITUDE: -157.212500 * NORTH-BOUND LATITUDE: 54.303833 * EAST-BOUND LONGITUDE: -157.195167 * DATE/TIME START: 1994-08-17T05:22:00 * DATE/TIME END: 1996-08-02T16:34:00 |
long_lat |
ENVELOPE(-157.212500,-157.195167,54.303833,54.299667) |
genre |
Kodiak Alaska |
genre_facet |
Kodiak Alaska |
op_source |
Supplement to: Greinert, Jens; Bohrmann, Gerhard; Elvert, Marcus (2002): Stromatolitic fabric of authigenic carbonate crusts. Results of anaerobic methane oxidation at cold seeps in 4850m water depth. International Journal of Earth Sciences, 91, 698-711, https://doi.org/10.1007/s00531-001-0244-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.767424 https://doi.org/10.1594/PANGAEA.767424 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.767424 https://doi.org/10.1007/s00531-001-0244-9 |
_version_ |
1766059026624282624 |