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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2024
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| Online Access: | https://doi.org/10.1594/PANGAEA.967492 |
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| _version_ | 1867168227936698368 |
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| author | Lyu, Jing Barragán-Montilla, Sofía Auer, Gerald Bialik, Or M Sarr, Anta-Clarisse |
| author_facet | Lyu, Jing Barragán-Montilla, Sofía Auer, Gerald Bialik, Or M Sarr, Anta-Clarisse |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The late Miocene and early Pliocene were marked by widespread oxygen depletion in the Pacific and Indian Oceans in conjunction with the so-called "Late Miocene Biogenic Bloom" (LMBB). As the oxygen depletion progressed, it was accompanied by an oxygen minimum zone (OMZ) expansion, hypothesized to extend as far south as Broken Ridge (31°S), Indian Ocean. Here, we used benthic foraminiferal (BF) assemblage from Ocean Drilling Program (ODP) Site 752 (ODP Expedition 121) to reconstruct the bottom water dissolved oxygen concentration on Broken Ridge during the last 9 million years. Taxonomic analyses on the >63μm fraction allowed the identification of 93 BF species and reported as benthic foraminifera row counts. The relative frequencies derived from BF row counts were used to determine diversity using the Fisher Alpha index and dissolved oxygen concentration was reconstructed using the Enhanced Benthic Foraminifera Oxygen Index. Benthic foraminifera with abundances below 5% across all samples were removed before statistical analysis to retain a robust signal of BF distribution without single and scattered occurrences. High abundance BF was reported in the grouped benthic foraminifera counts. Our results indicate well-oxygenated (dissolved oxygen concentration >3ml/L) bottom water conditions in the last 9 million years. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_967492 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Oxygenated bottom water conditions on Broken Ridge (central Indian Ocean) in the last 9 million years Lyu, Jing Barragán-Montilla, Sofía Auer, Gerald Bialik, Or M Sarr, Anta-Clarisse 121-752A; AGE; Amphicoryna scalaris; Anomalinoides globulosus; Anomalinoides spp.; Benthic foraminifera assemblages; Biogenic bloom; Bolivina cf. viennensis; Bolivina reticulata; Bolivina spathulata; Bolivinellina translucens; Bulimina striata; Bulimina truncana; Buliminella spp.; Cassidulina laevigata; Chrysalogonium deceptorium; Chrysalogonium equisetiformis; Cibicidoides bradyi; Cibicidoides mundulus; Cibicidoides sp.; Cibicidoides wuellerstorfi; Clavulina sp.; Counting >63 µm fraction; Cushmanina plumigera; Dentalina bene; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eggerella bradyi; Ehrenbergina carinata; Favulina hexagona; Favulina squamosa; Fissurina sp.; Fissurina spp.; Foraminifera, benthic, total; Fursenkoina sp.; Gavelinopsis praegeri; Glandulina cf. ovula; Glandulonodosaria ambigua; Globocassidulina subglobosa; Gyroidina altiformis; Gyroidina soldanii; Gyroidina sp.; Hanzawaia boueana; Hoeglundina elegans; IODP Depth Scale Terminology; Joides Resolution; Karreriella bradyi; Karreriella sp.; Lagena hispida; Lagena nebulosa; Lagena sp.; Lagena striata; Late Miocene; Laticarinina pauperata; Leg121; Lenticulina calcar; Lenticulina cultrata; Lenticulina sp.; Lobatula lobatula; Melonis affinis; Melonis sp.; Nodosaria spp.; Obesopleurostomella brevis; OMZ; Oridorsalis umbonatus; Orthomorphina perversa; Orthomorphina sp.; Osangularia culter; Planulina sp.; Pleurostomella acuminata; Pleurostomella sp.; Pullenia bulloides; Pullenia quinqueloba; Pyrgoella sphaera; Quinqueloculina seminulum; Quinqueloculina sp.; Rectuvigerina cf. phlegeri; Rectuvigerina sp.; Rectuvigerina striata; Rotaliidae; Sample code/label; Siphonodosaria consobrina; Siphonodosaria hispidula; Siphonodosaria lepidula; Siphonodosaria pomuligera; Siphonodosaria sp.; Siphonodosaria spp.; Siphonodosaria subspinosa; Siphouvigerina hispida; South Indian Ridge, South Indian Ocean; Sphaeroidina bulloides; Spiroloculina rotunda; Spiroplectinella sp.; Spirosigmoilina tenuis; Strictocostella modesta; Strictocostella scharbergana; Strictocostella sp.; Tasman Leakage; Textularia sp.; Trifarina angulosa; Trifarina bradyi; Trifarina sp.; Uvigerina auberiana; Uvigerina peregrina; Uvigerina sp. The late Miocene and early Pliocene were marked by widespread oxygen depletion in the Pacific and Indian Oceans in conjunction with the so-called "Late Miocene Biogenic Bloom" (LMBB). As the oxygen depletion progressed, it was accompanied by an oxygen minimum zone (OMZ) expansion, hypothesized to extend as far south as Broken Ridge (31°S), Indian Ocean. Here, we used benthic foraminiferal (BF) assemblage from Ocean Drilling Program (ODP) Site 752 (ODP Expedition 121) to reconstruct the bottom water dissolved oxygen concentration on Broken Ridge during the last 9 million years. Taxonomic analyses on the >63μm fraction allowed the identification of 93 BF species and reported as benthic foraminifera row counts. The relative frequencies derived from BF row counts were used to determine diversity using the Fisher Alpha index and dissolved oxygen concentration was reconstructed using the Enhanced Benthic Foraminifera Oxygen Index. Benthic foraminifera with abundances below 5% across all samples were removed before statistical analysis to retain a robust signal of BF distribution without single and scattered occurrences. High abundance BF was reported in the grouped benthic foraminifera counts. Our results indicate well-oxygenated (dissolved oxygen concentration >3ml/L) bottom water conditions in the last 9 million years. |
| title | Oxygenated bottom water conditions on Broken Ridge (central Indian Ocean) in the last 9 million years |
| topic | 121-752A; AGE; Amphicoryna scalaris; Anomalinoides globulosus; Anomalinoides spp.; Benthic foraminifera assemblages; Biogenic bloom; Bolivina cf. viennensis; Bolivina reticulata; Bolivina spathulata; Bolivinellina translucens; Bulimina striata; Bulimina truncana; Buliminella spp.; Cassidulina laevigata; Chrysalogonium deceptorium; Chrysalogonium equisetiformis; Cibicidoides bradyi; Cibicidoides mundulus; Cibicidoides sp.; Cibicidoides wuellerstorfi; Clavulina sp.; Counting >63 µm fraction; Cushmanina plumigera; Dentalina bene; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eggerella bradyi; Ehrenbergina carinata; Favulina hexagona; Favulina squamosa; Fissurina sp.; Fissurina spp.; Foraminifera, benthic, total; Fursenkoina sp.; Gavelinopsis praegeri; Glandulina cf. ovula; Glandulonodosaria ambigua; Globocassidulina subglobosa; Gyroidina altiformis; Gyroidina soldanii; Gyroidina sp.; Hanzawaia boueana; Hoeglundina elegans; IODP Depth Scale Terminology; Joides Resolution; Karreriella bradyi; Karreriella sp.; Lagena hispida; Lagena nebulosa; Lagena sp.; Lagena striata; Late Miocene; Laticarinina pauperata; Leg121; Lenticulina calcar; Lenticulina cultrata; Lenticulina sp.; Lobatula lobatula; Melonis affinis; Melonis sp.; Nodosaria spp.; Obesopleurostomella brevis; OMZ; Oridorsalis umbonatus; Orthomorphina perversa; Orthomorphina sp.; Osangularia culter; Planulina sp.; Pleurostomella acuminata; Pleurostomella sp.; Pullenia bulloides; Pullenia quinqueloba; Pyrgoella sphaera; Quinqueloculina seminulum; Quinqueloculina sp.; Rectuvigerina cf. phlegeri; Rectuvigerina sp.; Rectuvigerina striata; Rotaliidae; Sample code/label; Siphonodosaria consobrina; Siphonodosaria hispidula; Siphonodosaria lepidula; Siphonodosaria pomuligera; Siphonodosaria sp.; Siphonodosaria spp.; Siphonodosaria subspinosa; Siphouvigerina hispida; South Indian Ridge, South Indian Ocean; Sphaeroidina bulloides; Spiroloculina rotunda; Spiroplectinella sp.; Spirosigmoilina tenuis; Strictocostella modesta; Strictocostella scharbergana; Strictocostella sp.; Tasman Leakage; Textularia sp.; Trifarina angulosa; Trifarina bradyi; Trifarina sp.; Uvigerina auberiana; Uvigerina peregrina; Uvigerina sp. |
| url | https://doi.org/10.1594/PANGAEA.967492 |