Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica
Early diagenetic (precompactional) concretions are abundant throughout the Cretaceous-Tertiary Marambio Group Larsen Basin, Antarctica. Four distinct concretion types are recognised: (1) spherical-subspherical concretions: (2) sheet concretions; (3) fossil-nucleated concretions; and (4) concretionar...
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ftnerc:oai:nora.nerc.ac.uk:520143 2023-05-15T13:49:35+02:00 Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica Pirrie, Duncan Marshall, James D. 1991 http://nora.nerc.ac.uk/id/eprint/520143/ https://doi.org/10.1016/0037-0738(91)90098-X unknown Elsevier Pirrie, Duncan; Marshall, James D. 1991 Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica. Sedimentary Geology, 71 (3-4). 137-150. https://doi.org/10.1016/0037-0738(91)90098-X <https://doi.org/10.1016/0037-0738(91)90098-X> Earth Sciences Publication - Article PeerReviewed 1991 ftnerc https://doi.org/10.1016/0037-0738(91)90098-X 2023-02-04T19:46:36Z Early diagenetic (precompactional) concretions are abundant throughout the Cretaceous-Tertiary Marambio Group Larsen Basin, Antarctica. Four distinct concretion types are recognised: (1) spherical-subspherical concretions: (2) sheet concretions; (3) fossil-nucleated concretions; and (4) concretionary burrow networks. All concretion types have a micritic to microsparry variably non-ferroan to ferroan calcite cement. Stable isotope analyses show a wide spread in both δ18O and δ13C. δ13C values are typically negative, ranging between –3.38 and –39.15%o (PDB) (usually –16 to 230%). δ18O ranges between –1.28 and –13.81% (PDB) with most of the values between –5 and –10%. The δ13C signature is interpreted to represent carbon sourced from sulphate reduction and/or methane oxidation, with minor input from shell dissolution, and is consistent with a shallow burial, early diagenetic origin. A single mudstone hosted concretion has a δ18O composition indicative of precipitation of carbonate from seawater. The low δ18O signatures in the sandstone- and siltstone-hosted concretions are possibly due to early diagenetic modification of the pore water composition through volcaniclastic mineral dissolution/reprecipitation reactions and perhaps through input of meteoric water. Concretion distribution is related to (a) changes in sedimentation rate and (b) the dominance of diffusion on concretion cementation. Article in Journal/Newspaper Antarc* Antarctica James Ross Island Ross Island Natural Environment Research Council: NERC Open Research Archive Ross Island Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Larsen Basin ENVELOPE(-60.000,-60.000,-68.000,-68.000) Sedimentary Geology 71 3-4 137 150 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Pirrie, Duncan Marshall, James D. Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
topic_facet |
Earth Sciences |
description |
Early diagenetic (precompactional) concretions are abundant throughout the Cretaceous-Tertiary Marambio Group Larsen Basin, Antarctica. Four distinct concretion types are recognised: (1) spherical-subspherical concretions: (2) sheet concretions; (3) fossil-nucleated concretions; and (4) concretionary burrow networks. All concretion types have a micritic to microsparry variably non-ferroan to ferroan calcite cement. Stable isotope analyses show a wide spread in both δ18O and δ13C. δ13C values are typically negative, ranging between –3.38 and –39.15%o (PDB) (usually –16 to 230%). δ18O ranges between –1.28 and –13.81% (PDB) with most of the values between –5 and –10%. The δ13C signature is interpreted to represent carbon sourced from sulphate reduction and/or methane oxidation, with minor input from shell dissolution, and is consistent with a shallow burial, early diagenetic origin. A single mudstone hosted concretion has a δ18O composition indicative of precipitation of carbonate from seawater. The low δ18O signatures in the sandstone- and siltstone-hosted concretions are possibly due to early diagenetic modification of the pore water composition through volcaniclastic mineral dissolution/reprecipitation reactions and perhaps through input of meteoric water. Concretion distribution is related to (a) changes in sedimentation rate and (b) the dominance of diffusion on concretion cementation. |
format |
Article in Journal/Newspaper |
author |
Pirrie, Duncan Marshall, James D. |
author_facet |
Pirrie, Duncan Marshall, James D. |
author_sort |
Pirrie, Duncan |
title |
Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
title_short |
Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
title_full |
Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
title_fullStr |
Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
title_full_unstemmed |
Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica |
title_sort |
field relationships and stable isotope geochemistry of concretions from james ross island, antarctica |
publisher |
Elsevier |
publishDate |
1991 |
url |
http://nora.nerc.ac.uk/id/eprint/520143/ https://doi.org/10.1016/0037-0738(91)90098-X |
long_lat |
ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-60.000,-60.000,-68.000,-68.000) |
geographic |
Ross Island Marambio Larsen Basin |
geographic_facet |
Ross Island Marambio Larsen Basin |
genre |
Antarc* Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctica James Ross Island Ross Island |
op_relation |
Pirrie, Duncan; Marshall, James D. 1991 Field relationships and stable isotope geochemistry of concretions from James Ross Island, Antarctica. Sedimentary Geology, 71 (3-4). 137-150. https://doi.org/10.1016/0037-0738(91)90098-X <https://doi.org/10.1016/0037-0738(91)90098-X> |
op_doi |
https://doi.org/10.1016/0037-0738(91)90098-X |
container_title |
Sedimentary Geology |
container_volume |
71 |
container_issue |
3-4 |
container_start_page |
137 |
op_container_end_page |
150 |
_version_ |
1766251775860408320 |