Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment 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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ftunivnebraskali:oai:digitalcommons.unl.edu:andrillrespub-1054 2023-11-12T04:03:33+01:00 Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard 2013-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/andrillrespub/54 https://digitalcommons.unl.edu/context/andrillrespub/article/1054/viewcontent/Scopelliti_GPC_2013_Chemostratigraphy__DC_VERSION.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/andrillrespub/54 https://digitalcommons.unl.edu/context/andrillrespub/article/1054/viewcontent/Scopelliti_GPC_2013_Chemostratigraphy__DC_VERSION.pdf ANDRILL Research and Publications biogenic opal element geochemistry paleoenvironment Biogeochemistry Geochemistry Paleobiology Sedimentology Stratigraphy text 2013 ftunivnebraskali 2023-10-30T11:01:35Z 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 non-steady-state processes leading to local peaks of barium below the sulfate-rich/sulfate-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 ... Text Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf University of Nebraska-Lincoln: DigitalCommons@UNL Antarctic Austral McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
biogenic opal element geochemistry paleoenvironment Biogeochemistry Geochemistry Paleobiology Sedimentology Stratigraphy |
spellingShingle |
biogenic opal element geochemistry paleoenvironment Biogeochemistry Geochemistry Paleobiology Sedimentology Stratigraphy Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications |
topic_facet |
biogenic opal element geochemistry paleoenvironment Biogeochemistry Geochemistry Paleobiology Sedimentology Stratigraphy |
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 non-steady-state processes leading to local peaks of barium below the sulfate-rich/sulfate-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 ... |
format |
Text |
author |
Scopelliti, Giovanna Bellanca, Adriana Monien, Donata Kuhn, Gerhard |
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): Paleoenvironment implications |
title_short |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications |
title_full |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications |
title_fullStr |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications |
title_full_unstemmed |
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Paleoenvironment implications |
title_sort |
chemostratigraphy of the early pliocene diatomite interval from mis and-1b core (antarctica): paleoenvironment implications |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2013 |
url |
https://digitalcommons.unl.edu/andrillrespub/54 https://digitalcommons.unl.edu/context/andrillrespub/article/1054/viewcontent/Scopelliti_GPC_2013_Chemostratigraphy__DC_VERSION.pdf |
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 |
ANDRILL Research and Publications |
op_relation |
https://digitalcommons.unl.edu/andrillrespub/54 https://digitalcommons.unl.edu/context/andrillrespub/article/1054/viewcontent/Scopelliti_GPC_2013_Chemostratigraphy__DC_VERSION.pdf |
_version_ |
1782337826592915456 |