Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect
Abstract We investigate chronology and age uncertainty for the middle to upper Pleistocene lower Bengal Fan using a novel age‐depth modeling approach that factors lithostratigraphic, magnetostratigraphic, biostratigraphic, cyclostratigraphic, and seismic stratigraphic constraints, based on results f...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-04-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2019GC008878 |
| _version_ | 1797638001021419520 |
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| author | Brendan T. Reilly Fenna Bergmann Michael E. Weber Joseph S. Stoner Peter Selkin Laure Meynadier Tilmann Schwenk Volkhard Spiess Christian France‐Lanord |
| author_facet | Brendan T. Reilly Fenna Bergmann Michael E. Weber Joseph S. Stoner Peter Selkin Laure Meynadier Tilmann Schwenk Volkhard Spiess Christian France‐Lanord |
| author_sort | Brendan T. Reilly |
| collection | DOAJ |
| description | Abstract We investigate chronology and age uncertainty for the middle to upper Pleistocene lower Bengal Fan using a novel age‐depth modeling approach that factors lithostratigraphic, magnetostratigraphic, biostratigraphic, cyclostratigraphic, and seismic stratigraphic constraints, based on results from the International Ocean Discovery Program Expedition 354 Bengal Fan and analysis of the GeoB97‐020/027 seismic line. The initial chronostratigraphic framework is established using regionally extensive hemipelagic sediment units, and only age‐depth models of fan deposits that respect the superposition of channel‐levee systems between sites are accepted. In doing so, we reconstruct signals of regional sediment accumulation rate and lithogenic sediment input through the perspective of a two‐dimensional ~320 km transect at 8°N that are consistent with more distal and more ambiguous regional records. This chronology allows us to discuss the depositional history of the middle to upper Pleistocene lower Bengal Fan within the context of sea level, climate, and tectonic controls. We hypothesize, based on the timing of accumulation rate changes, that progradation and intensification of the Bengal Fan's channel‐levee system at 8°N was largely driven by increases in sea level amplitude during this time. However, it is also possible this progradation was influenced by changes in Pleistocene climate and increased Himalayan erosion rates, driving greater sediment flux to the fan. |
| first_indexed | 2024-03-11T12:57:24Z |
| format | Article |
| id | doaj.art-479ec689ba5d44198e022818a788530c |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:57:24Z |
| publishDate | 2020-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-479ec689ba5d44198e022818a788530c2023-11-03T17:00:28ZengWileyGeochemistry, Geophysics, Geosystems1525-20272020-04-01214n/an/a10.1029/2019GC008878Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North TransectBrendan T. Reilly0Fenna Bergmann1Michael E. Weber2Joseph S. Stoner3Peter Selkin4Laure Meynadier5Tilmann Schwenk6Volkhard Spiess7Christian France‐Lanord8College of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis OR USAFaculty of Geosciences University of Bremen Bremen GermanySteinmann‐Institute University of Bonn Bonn GermanyCollege of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis OR USASchool of Interdisciplinary Arts and Sciences University of Washington Tacoma WA USAInstitut de Physique du Globe de Paris‐Sorbonne Paris Cité Université Paris Diderot Paris FranceFaculty of Geosciences University of Bremen Bremen GermanyFaculty of Geosciences University of Bremen Bremen GermanyCentre de Recherches Pétrographiques et Géochimiques CNRS Université de Lorraine Vandoeuvre les Nancy FranceAbstract We investigate chronology and age uncertainty for the middle to upper Pleistocene lower Bengal Fan using a novel age‐depth modeling approach that factors lithostratigraphic, magnetostratigraphic, biostratigraphic, cyclostratigraphic, and seismic stratigraphic constraints, based on results from the International Ocean Discovery Program Expedition 354 Bengal Fan and analysis of the GeoB97‐020/027 seismic line. The initial chronostratigraphic framework is established using regionally extensive hemipelagic sediment units, and only age‐depth models of fan deposits that respect the superposition of channel‐levee systems between sites are accepted. In doing so, we reconstruct signals of regional sediment accumulation rate and lithogenic sediment input through the perspective of a two‐dimensional ~320 km transect at 8°N that are consistent with more distal and more ambiguous regional records. This chronology allows us to discuss the depositional history of the middle to upper Pleistocene lower Bengal Fan within the context of sea level, climate, and tectonic controls. We hypothesize, based on the timing of accumulation rate changes, that progradation and intensification of the Bengal Fan's channel‐levee system at 8°N was largely driven by increases in sea level amplitude during this time. However, it is also possible this progradation was influenced by changes in Pleistocene climate and increased Himalayan erosion rates, driving greater sediment flux to the fan.https://doi.org/10.1029/2019GC008878Bengal FanHimalayaPleistocenechronostratigraphic modelingdeep sea fanIODP |
| spellingShingle | Brendan T. Reilly Fenna Bergmann Michael E. Weber Joseph S. Stoner Peter Selkin Laure Meynadier Tilmann Schwenk Volkhard Spiess Christian France‐Lanord Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect Geochemistry, Geophysics, Geosystems Bengal Fan Himalaya Pleistocene chronostratigraphic modeling deep sea fan IODP |
| title | Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect |
| title_full | Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect |
| title_fullStr | Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect |
| title_full_unstemmed | Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect |
| title_short | Middle to Late Pleistocene Evolution of the Bengal Fan: Integrating Core and Seismic Observations for Chronostratigraphic Modeling of the IODP Expedition 354 8° North Transect |
| title_sort | middle to late pleistocene evolution of the bengal fan integrating core and seismic observations for chronostratigraphic modeling of the iodp expedition 354 8° north transect |
| topic | Bengal Fan Himalaya Pleistocene chronostratigraphic modeling deep sea fan IODP |
| url | https://doi.org/10.1029/2019GC008878 |
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