Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications
The AND-1B drill core (1285 m-long) was recovered, inside the ANDRILL (ANtarctic geological DRILLing) Program, during the austral summer of 2006/07 from beneath the floating McMurdo Ice Shelf. Drilling recovered a stratigraphic succession of alternating diamictites, diatomites and volcaniclastic sed...
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Online Access: | https://epic.awi.de/id/eprint/32482/ https://doi.org/10.1016/j.gloplacha.2013.01.001 https://hdl.handle.net/10013/epic.41093 |
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ftawi:oai:epic.awi.de:32482 2023-05-15T13:40:26+02:00 Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard 2013 https://epic.awi.de/id/eprint/32482/ https://doi.org/10.1016/j.gloplacha.2013.01.001 https://hdl.handle.net/10013/epic.41093 unknown Elsevier Scopelliti, G. , Bellanca, A. , Monien, D. and Kuhn, G. orcid:0000-0001-6069-7485 (2013) Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications , Global and Planetary Change, 102 , pp. 20-32 . doi:10.1016/j.gloplacha.2013.01.001 <https://doi.org/10.1016/j.gloplacha.2013.01.001> , hdl:10013/epic.41093 EPIC3Global and Planetary Change, Elsevier, 102, pp. 20-32, ISSN: 09218181 Article isiRev 2013 ftawi https://doi.org/10.1016/j.gloplacha.2013.01.001 2021-12-24T15:38:26Z The AND-1B drill core (1285 m-long) was recovered, inside the ANDRILL (ANtarctic geological DRILLing) Program, during the austral summer of 2006/07 from beneath the floating McMurdo Ice Shelf. Drilling recovered a stratigraphic succession of alternating diamictites, diatomites and volcaniclastic sediments spanning about the last 14 Ma. A core portion between 350 and 480 mbsf, including a 80 m-thick diatomite interval recording the early Pliocene warming event, was investigated in term of opal biogenic content and element geochemistry. Across the diatomite interval, in spite of the lithological uniformity, a fluctuating biogenic opal profile mirrors the δ18O record, testifying a decrease in productivity when temperature drops as a consequence of small glacial fluctuations. The comparison of biogenic opal data with Chaetoceros spp. abundances from Konfirst et al. (2012) documents alternations between periods of high primary productivity in stratified surface waters and of enhanced terrigenous input in ice-free conditions. Cluster analysis discriminates elements associated to terrigenous input from those subject to biogenic control. Further separation in sub-cluster was interpreted in term of different element response to changes in provenance but also to depositional/early diagenetic conditions at the seafloor. Whilst K and Ti are related to different sediment sources confirming previous studies from the same interval, V, Zn and, to a lesser extent, Fe, document reducing/anoxic conditions during the diatomites deposition (in particular in 400–460 mbsf interval). Mg, Sr and Mn contents are related to authigenic carbonate precipitation whilst Ba is interested by nonsteady-state processes leading to local peaks of barium below the sulphate-rich/sulphate-poor pore water boundary where generally the low degree of barite saturation is responsible for Ba remobilization. Such alteration in depositional dynamics, responsible of the precipitation of an oxygen-depleted barium phase, was probably induced by change in sedimentation rate and/or in palaeoenvironmental conditions. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Austral McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Global and Planetary Change 102 20 32 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The AND-1B drill core (1285 m-long) was recovered, inside the ANDRILL (ANtarctic geological DRILLing) Program, during the austral summer of 2006/07 from beneath the floating McMurdo Ice Shelf. Drilling recovered a stratigraphic succession of alternating diamictites, diatomites and volcaniclastic sediments spanning about the last 14 Ma. A core portion between 350 and 480 mbsf, including a 80 m-thick diatomite interval recording the early Pliocene warming event, was investigated in term of opal biogenic content and element geochemistry. Across the diatomite interval, in spite of the lithological uniformity, a fluctuating biogenic opal profile mirrors the δ18O record, testifying a decrease in productivity when temperature drops as a consequence of small glacial fluctuations. The comparison of biogenic opal data with Chaetoceros spp. abundances from Konfirst et al. (2012) documents alternations between periods of high primary productivity in stratified surface waters and of enhanced terrigenous input in ice-free conditions. Cluster analysis discriminates elements associated to terrigenous input from those subject to biogenic control. Further separation in sub-cluster was interpreted in term of different element response to changes in provenance but also to depositional/early diagenetic conditions at the seafloor. Whilst K and Ti are related to different sediment sources confirming previous studies from the same interval, V, Zn and, to a lesser extent, Fe, document reducing/anoxic conditions during the diatomites deposition (in particular in 400–460 mbsf interval). Mg, Sr and Mn contents are related to authigenic carbonate precipitation whilst Ba is interested by nonsteady-state processes leading to local peaks of barium below the sulphate-rich/sulphate-poor pore water boundary where generally the low degree of barite saturation is responsible for Ba remobilization. Such alteration in depositional dynamics, responsible of the precipitation of an oxygen-depleted barium phase, was probably induced by change in sedimentation rate and/or in palaeoenvironmental conditions. |
format |
Article in Journal/Newspaper |
author |
Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard |
spellingShingle |
Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
author_facet |
Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard |
author_sort |
Scopelliti, Giovanna |
title |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
title_short |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
title_full |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
title_fullStr |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
title_full_unstemmed |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications |
title_sort |
chemostratigraphy of the early pliocene diatomite interval from mis and-1b core (antarctica): palaeoenvironment implications |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/32482/ https://doi.org/10.1016/j.gloplacha.2013.01.001 https://hdl.handle.net/10013/epic.41093 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
Antarctic Austral McMurdo Ice Shelf |
geographic_facet |
Antarctic Austral McMurdo Ice Shelf |
genre |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf |
op_source |
EPIC3Global and Planetary Change, Elsevier, 102, pp. 20-32, ISSN: 09218181 |
op_relation |
Scopelliti, G. , Bellanca, A. , Monien, D. and Kuhn, G. orcid:0000-0001-6069-7485 (2013) Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications , Global and Planetary Change, 102 , pp. 20-32 . doi:10.1016/j.gloplacha.2013.01.001 <https://doi.org/10.1016/j.gloplacha.2013.01.001> , hdl:10013/epic.41093 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2013.01.001 |
container_title |
Global and Planetary Change |
container_volume |
102 |
container_start_page |
20 |
op_container_end_page |
32 |
_version_ |
1766133381065605120 |