Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: implications for regional and global correlation
The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the s...
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| Veröffentlicht in: | Geological magazine 2017-09, Vol.154 (5), p.1022-1036 |
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| creator | GONZÁLEZ ESTEBENET, M. SOL GUERSTEIN, G. RAQUEL RODRÍGUEZ RAISING, MARTÍN E. PONCE, JUAN J. ALPERÍN, MARTA I. |
| description | The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic–Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway). |
| doi_str_mv | 10.1017/S0016756816000601 |
| format | Article |
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SOL ; GUERSTEIN, G. RAQUEL ; RODRÍGUEZ RAISING, MARTÍN E. ; PONCE, JUAN J. ; ALPERÍN, MARTA I.</creator><creatorcontrib>GONZÁLEZ ESTEBENET, M. SOL ; GUERSTEIN, G. RAQUEL ; RODRÍGUEZ RAISING, MARTÍN E. ; PONCE, JUAN J. ; ALPERÍN, MARTA I.</creatorcontrib><description>The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic–Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway).</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S0016756816000601</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Argentina ; assemblages ; Atlantic Ocean ; Austral Basin ; basin analysis ; basins ; biostratigraphy ; biozones ; Cenozoic ; Circulation ; Cores ; Cosmopolitan species ; Cysts ; Dinoflagellata ; Drake Passage ; Endemic species ; Eocene ; Fossils ; Geological time ; Markers ; microfossils ; Microorganisms ; Ocean circulation ; Ocean currents ; Original Articles ; Palaeogene ; paleoclimatology ; Paleoecology ; Paleogene ; paleogeography ; palynomorphs ; Patagonia ; Plantae ; reconstruction ; Rio Turbio Formation ; sedimentary basins ; South America ; South Atlantic ; Southwest Atlantic ; Stratigraphy ; Tertiary ; upper Eocene ; Water circulation ; Zonation</subject><ispartof>Geological magazine, 2017-09, Vol.154 (5), p.1022-1036</ispartof><rights>Copyright © Cambridge University Press 2016</rights><rights>GeoRef, Copyright 2020, American Geosciences Institute. 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RAQUEL</creatorcontrib><creatorcontrib>RODRÍGUEZ RAISING, MARTÍN E.</creatorcontrib><creatorcontrib>PONCE, JUAN J.</creatorcontrib><creatorcontrib>ALPERÍN, MARTA I.</creatorcontrib><title>Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: implications for regional and global correlation</title><title>Geological magazine</title><addtitle>Geol. Mag</addtitle><description>The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic–Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway).</description><subject>Argentina</subject><subject>assemblages</subject><subject>Atlantic Ocean</subject><subject>Austral Basin</subject><subject>basin analysis</subject><subject>basins</subject><subject>biostratigraphy</subject><subject>biozones</subject><subject>Cenozoic</subject><subject>Circulation</subject><subject>Cores</subject><subject>Cosmopolitan species</subject><subject>Cysts</subject><subject>Dinoflagellata</subject><subject>Drake Passage</subject><subject>Endemic species</subject><subject>Eocene</subject><subject>Fossils</subject><subject>Geological time</subject><subject>Markers</subject><subject>microfossils</subject><subject>Microorganisms</subject><subject>Ocean circulation</subject><subject>Ocean currents</subject><subject>Original Articles</subject><subject>Palaeogene</subject><subject>paleoclimatology</subject><subject>Paleoecology</subject><subject>Paleogene</subject><subject>paleogeography</subject><subject>palynomorphs</subject><subject>Patagonia</subject><subject>Plantae</subject><subject>reconstruction</subject><subject>Rio Turbio Formation</subject><subject>sedimentary basins</subject><subject>South America</subject><subject>South Atlantic</subject><subject>Southwest Atlantic</subject><subject>Stratigraphy</subject><subject>Tertiary</subject><subject>upper Eocene</subject><subject>Water circulation</subject><subject>Zonation</subject><issn>0016-7568</issn><issn>1469-5081</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp1UctO3DAUtSqQGIZ-ADtLXbZp7ThjO91NKYVKI80Cuo4c5yYYeexgO0LwM_xqnRkkKlWsfK1zz-PqIHROyVdKqPh2QwjlYsUl5YQQTugHtKAVr4sVkfQILWa4mPETdBrjff4yIuUCvfw0zvdWDWCtSoD1U0z42TuVjHe49wGnO8A703UWcPJ4GkcI-NJrcICN26PrKaagLP6honFfcPRTunuEmCA4vE5WuWQ03mpQ7js2u9EavVePe_kAQ54zW7kOD9a3edQ-BLD7pTN03Csb4ePru0R_fl3eXlwXm-3V74v1plBM8FT0HVc9qalgUnZkJdiqqiinNZPQslr1vQQo2yqfTVsuWakqQquyYiWQstRCsCX6dNAdg3-Ycvjm3k8h54pNViGi4iLzlogetnTwMQbomzGYnQpPDSXN3EPzXw-Z8_nAGcBHbcBpePTBdm8G5UzMNdF6dmCvDmrXBtMN8E-Qdz3-AkkEmj0</recordid><startdate>201709</startdate><enddate>201709</enddate><creator>GONZÁLEZ ESTEBENET, M. SOL</creator><creator>GUERSTEIN, G. RAQUEL</creator><creator>RODRÍGUEZ RAISING, MARTÍN E.</creator><creator>PONCE, JUAN J.</creator><creator>ALPERÍN, MARTA I.</creator><general>Cambridge University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H96</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>L6V</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>R05</scope></search><sort><creationdate>201709</creationdate><title>Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: implications for regional and global correlation</title><author>GONZÁLEZ ESTEBENET, M. 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SOL</creatorcontrib><creatorcontrib>GUERSTEIN, G. 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SOL</au><au>GUERSTEIN, G. RAQUEL</au><au>RODRÍGUEZ RAISING, MARTÍN E.</au><au>PONCE, JUAN J.</au><au>ALPERÍN, MARTA I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: implications for regional and global correlation</atitle><jtitle>Geological magazine</jtitle><addtitle>Geol. Mag</addtitle><date>2017-09</date><risdate>2017</risdate><volume>154</volume><issue>5</issue><spage>1022</spage><epage>1036</epage><pages>1022-1036</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><abstract>The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic–Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway).</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S0016756816000601</doi><tpages>15</tpages></addata></record> |
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| source | Cambridge University Press Journals Complete |
| subjects | Argentina assemblages Atlantic Ocean Austral Basin basin analysis basins biostratigraphy biozones Cenozoic Circulation Cores Cosmopolitan species Cysts Dinoflagellata Drake Passage Endemic species Eocene Fossils Geological time Markers microfossils Microorganisms Ocean circulation Ocean currents Original Articles Palaeogene paleoclimatology Paleoecology Paleogene paleogeography palynomorphs Patagonia Plantae reconstruction Rio Turbio Formation sedimentary basins South America South Atlantic Southwest Atlantic Stratigraphy Tertiary upper Eocene Water circulation Zonation |
| title | Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: implications for regional and global correlation |
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