Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau
A set of newly collected 2D seismic reflection data allows the mapping of two distinct cross-cutting reflectors across the Falkland/Malvinas Plateau. Reflector XR-F/MB in the Falkland/Malvinas Basin appears as a bottom simulating reflector that mimics the geometry of the present seafloor, whereas re...
Published in: | Marine and Petroleum Geology |
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Elsevier
2023
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Online Access: | https://epic.awi.de/id/eprint/57576/ https://epic.awi.de/id/eprint/57576/1/Najjarifarizhendi_Uenzelmann-Neben.pdf https://hdl.handle.net/10013/epic.2d9efe7c-4a96-4ab1-8860-eee10d346f09 |
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ftawi:oai:epic.awi.de:57576 2024-03-24T08:56:38+00:00 Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau Najjarifarizhendi, Banafsheh Uenzelmann-Neben, Gabriele 2023-02-01 application/pdf https://epic.awi.de/id/eprint/57576/ https://epic.awi.de/id/eprint/57576/1/Najjarifarizhendi_Uenzelmann-Neben.pdf https://hdl.handle.net/10013/epic.2d9efe7c-4a96-4ab1-8860-eee10d346f09 unknown Elsevier https://epic.awi.de/id/eprint/57576/1/Najjarifarizhendi_Uenzelmann-Neben.pdf Najjarifarizhendi, B. orcid:0000-0001-5994-6325 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2023) Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau , Marine and Petroleum Geology, 148 , p. 106035 . doi:10.1016/j.marpetgeo.2022.106035 <https://doi.org/10.1016/j.marpetgeo.2022.106035> , hdl:10013/epic.2d9efe7c-4a96-4ab1-8860-eee10d346f09 EPIC3Marine and Petroleum Geology, Elsevier, 148, pp. 106035-106035, ISSN: 0264-8172 Article isiRev 2023 ftawi https://doi.org/10.1016/j.marpetgeo.2022.106035 2024-02-27T09:55:26Z A set of newly collected 2D seismic reflection data allows the mapping of two distinct cross-cutting reflectors across the Falkland/Malvinas Plateau. Reflector XR-F/MB in the Falkland/Malvinas Basin appears as a bottom simulating reflector that mimics the geometry of the present seafloor, whereas reflector XR-F/MT in the Falkland/Malvinas Trough is a non-bottom simulating reflector that mimics a shallower reflector representing theEarly-Middle Miocene unconformity. The discordant geometry of these two reflectors with respect to the hoststratigraphyis argued to be associated with Opal-A to Opal-CT diagenesis, which is primarily a function of temperature. However, the estimated temperature at the present depth for reflector XR-F/MB lies below the minimum temperature for the onset of silica diagenesis. Based on their geometry and seismic characteristics, the two reflectors are interpreted to be fossilized silica diagenetic fronts, formed under palaeo-thermal conditions different from today. We hypothesize that the erosional action of intensified deep and bottom water masses subsequent to Antarctic glaciations during the Early-Middle Miocene may have driven the fossilization of the diagenetic front in the study area. It is estimated that erosion of a minimum of 270 m of overburden would account for the temperature drop driving the fossilization of the silica diagenetic fron. Article in Journal/Newspaper Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Fron ENVELOPE(-21.900,-21.900,64.142,64.142) Marine and Petroleum Geology 148 106035 |
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 |
A set of newly collected 2D seismic reflection data allows the mapping of two distinct cross-cutting reflectors across the Falkland/Malvinas Plateau. Reflector XR-F/MB in the Falkland/Malvinas Basin appears as a bottom simulating reflector that mimics the geometry of the present seafloor, whereas reflector XR-F/MT in the Falkland/Malvinas Trough is a non-bottom simulating reflector that mimics a shallower reflector representing theEarly-Middle Miocene unconformity. The discordant geometry of these two reflectors with respect to the hoststratigraphyis argued to be associated with Opal-A to Opal-CT diagenesis, which is primarily a function of temperature. However, the estimated temperature at the present depth for reflector XR-F/MB lies below the minimum temperature for the onset of silica diagenesis. Based on their geometry and seismic characteristics, the two reflectors are interpreted to be fossilized silica diagenetic fronts, formed under palaeo-thermal conditions different from today. We hypothesize that the erosional action of intensified deep and bottom water masses subsequent to Antarctic glaciations during the Early-Middle Miocene may have driven the fossilization of the diagenetic front in the study area. It is estimated that erosion of a minimum of 270 m of overburden would account for the temperature drop driving the fossilization of the silica diagenetic fron. |
format |
Article in Journal/Newspaper |
author |
Najjarifarizhendi, Banafsheh Uenzelmann-Neben, Gabriele |
spellingShingle |
Najjarifarizhendi, Banafsheh Uenzelmann-Neben, Gabriele Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
author_facet |
Najjarifarizhendi, Banafsheh Uenzelmann-Neben, Gabriele |
author_sort |
Najjarifarizhendi, Banafsheh |
title |
Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
title_short |
Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
title_full |
Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
title_fullStr |
Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
title_full_unstemmed |
Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau |
title_sort |
fossilized silica diagenetic fronts: implications for palaeoceanographic evolution across the falkland/malvinas plateau |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/57576/ https://epic.awi.de/id/eprint/57576/1/Najjarifarizhendi_Uenzelmann-Neben.pdf https://hdl.handle.net/10013/epic.2d9efe7c-4a96-4ab1-8860-eee10d346f09 |
long_lat |
ENVELOPE(-21.900,-21.900,64.142,64.142) |
geographic |
Antarctic Fron |
geographic_facet |
Antarctic Fron |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3Marine and Petroleum Geology, Elsevier, 148, pp. 106035-106035, ISSN: 0264-8172 |
op_relation |
https://epic.awi.de/id/eprint/57576/1/Najjarifarizhendi_Uenzelmann-Neben.pdf Najjarifarizhendi, B. orcid:0000-0001-5994-6325 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2023) Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau , Marine and Petroleum Geology, 148 , p. 106035 . doi:10.1016/j.marpetgeo.2022.106035 <https://doi.org/10.1016/j.marpetgeo.2022.106035> , hdl:10013/epic.2d9efe7c-4a96-4ab1-8860-eee10d346f09 |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2022.106035 |
container_title |
Marine and Petroleum Geology |
container_volume |
148 |
container_start_page |
106035 |
_version_ |
1794403558405177344 |