Eocene climate record of a high southern latitude continental shelf: Seymour Island, Antarctica

Ivany, Linda C.; Lohmann, Kyger C.; Hasiuk, Franciszek; Blake, Daniel B.; Glass, Alexander; Aronson, Richard B.; Moody, Ryan M.

doi:10.1130/b26269.1

Cited by 156 publications

(175 citation statements)

References 58 publications

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“…Ivany et al, 2008 ) and Silurian brachiopods (Azmy et al, 1998 ), representing the primary marine calcite suite (Appendix 1). The study also investigates the REE composition of altered brachiopods from the Oligocene of the Antarctic, altered lime mudstone coeval with the Silurian brachiopods, and a suite of altered Ordovician lime mudstone and deep burial calcite cements from the St. George Group carbonates of western Newfoundland (Azmy et al, 2008; Appendix 1).…”

Section: Sample Materialsmentioning

confidence: 99%

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

et al. 2011

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Biogenic low-Mg calcite (brachiopods) Burial calcite cements lREE, REESN seawater compositions Diagenetic lREE and REEsN variations The l;REE and shale-normalized (PAAS) REEsN values of modern brachiopods (biogenic low-Mg calcite: blMC) represented by several species from high-to low latitudes, from shallow-to deep waters and from warm-and cold-water environments, define three distinct average 'seawater' trends. The warm-and cold-water brachiopods define two indistinguishable (p < O.OSO) groups that mimic open -ocean seawater REE chemistry, exhibiting the typical LREE enrichment with a slightly positive to negative Ce anomaly followed by an otherwise invariant series. Other recent brachiopods from an essentially siliciclastic seabed environment are distinct in both l;REE and REEsN trends from the previous two populations, showing a slight enrichment in the MREEs and an increasing trend in the HREEs. Other groups of modern brachiopods are characterized by elevated REEsN trends relative to the 'normal'groups as well as by complexity of the series trends.The most characteristic feature is the decrease in the HREEs in these brachiopods from areas of unusual productivity (i.e., such as upwelling currents, fluvial input and aerosol dust deposition). Preserved brachiopods from the Eocene and Silurian exhibit REEsN trends and Ce anomalies similar to that of the 'open-ocean' modern brachiopods, although, their enriched l;REE concentrations suggest precipitation ofblMC influenced by extrinsic environmental conditions. Preservation of the bLMC was tested by comparing the l;REE and REEsN trends of preserved Eocene brachiopods to those of Oligocene brachiopods that were altered in an open diagenetic system in the presence of phreatic meteoric-water. The altered blMC is enriched by approximately one order of magnitude in both l;REE and REEsN trends relative to that in blMC of their preserved counterparts. Similarly, the l;REE and REEsN of preserved Silurian brachiopod blMC were compared to those of their enclosing altered lime mudstone, which exhibits features of partly closed system, phreatic meteoric-water diagenesis. Despite these differences in the diagenetic alteration systems and processes, the l;REEs and REEsN trends of the blMC of altered brachiopods and of originally mixed mineralogy lime mudstones (now diagenetic low-Mg caldte) are enriched by about one order of magnitude relative to those observed in the coeval and preserved blMC. In contrast to the changes in l;REE and REEsN of carbonates exposed to phreatic meteoric-water diagenesis, are the REE compositions oflate burial calcite cements precipitated in diagenetically open systems from burial fluids. The l;REE and REEsN trends of the burial cements mimic those of their host lime mudstone, with all showing slight LREE enrichment and slight HREE depletion, exhibiting a 'chevron' pattern of the REEsN trends.The overall enrichment or depletion of the cement REEsN trends relative to that of their respective host rock material reflects not only the openness of the diag...

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Section: Sample Materialsmentioning

confidence: 99%

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

et al. 2011

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“…These species have been shown to lack vital effects which make them suitable for stable isotope analyses and seasonal paleotemperature reconstructions (e.g., Hickson et al, 1999;Schöne et al, 2005;Brocas et al, 2013;Royer et al, 2013;Schöne, 2013;Bušelić et al, 2015). Shallow-water mollusks represent an accurate archive of paleoclimatic information, and have been successfully used for past climate reconstructions (e.g., Ivany et al 2008;Huyghe et al, 2015), even if they can be influenced by salinity changes that affect δ 18 O and thus the estimated paleotemperatures (Huyghe et al, 2015). To accurately interpret the data resulting from the isotope analyses it is thus important to take into account also the paleoecology of the studied species, focusing especially on those variables which can affect the isotope signals and their consequent interpretation, such as the living depth and the tolerance to salinity changes.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Seasonality fluctuations recorded in fossil bivalves during the early Pleistocene: Implications for climate change

Crippa

Angiolini

Bottini

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Understanding the transformations of the climate system may help to predict and reduce the effects of global climate change. The geological record provides a unique archive that documents the long-term fluctuations of environmental variables, such as seasonal change. Here, we investigate how seasonal variation in seawater temperatures varied in the Mediterranean Sea during the early Pleistocene, approaching the Early-Middle Pleistocene Transition (EMPT) and the beginning of precession-driven Quaternary-style glacial-interglacial cycles. We performed whole-shell and sclerochemical stable isotope analyses (δ 18 O, δ 13 C) on bivalves, collected from

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“…2 and 3), accu mu lated within an in cised val ley (Sadler, 1988;Porêbski, 1995;Marenssi et al, 1998;Marenssi, 2006;Tatur et al, 2011). The for ma tion pre serves an ex cep tional re cord of a shal -low-ma rine eco sys tem (Feldmann and Woodburne, 1988;Stilwell and Zinsmeister, 1992;GaŸdzicki, 1996GaŸdzicki, , 1998GaŸdzicki, , 2001Dzik and GaŸdzicki, 2001;Fran cis et al, 2006;Uchman and GaŸdzi -cki, 2006;Ivany et al, 2008;GaŸdzicki and Majewski, 2012). Sadler (1988: fig.…”

Section: Geological and Stratigraphical Settingmentioning

confidence: 99%

“…The geo chem i cal anal y ses made on the fos sil bi valve shells from the La Meseta For ma tion sug gest a cli ma tic cool ing event dur ing the time of de po si tion of the up per most part of the for mation (GaŸdzicki et al, 1992;Din gle et al, 1998;Ivany et al, 2006Ivany et al, , 2008Cione et al, 2007;Fran cis et al, 2009;B³a¿ejowski et al, 2010). This is cor re lated with the first Ce no zoic gla ci ation of Antarctica and with the open ing of the Drake Pas sage at the Eocene-Oligocene bound ary (Zachos et al, 2001;Birkenmajer et al, 2005).…”

Section: Geological and Stratigraphical Settingmentioning

confidence: 99%

“…(Telm7) are rec og nized in the La Meseta For ma tion. In the for ma tion a grad ual de te ri o ra tion of cli mate is re corded, with the ev i dence of de creas ing tem per atures through the later Eocene cul mi nat ing with the first Antarc tic glaciations at the Eocene-Oligocene bound ary (GaŸdzi -cki et al, 1992;Din gle et al, 1998;Birkenmajer et al, 2005;Ivany et al, 2006Ivany et al, , 2008Tatur et al, 2006;Fran cis et al, 2009; see also Cantrill and Poole, 2012). Most pos si bly, the or i gin of the notothenioids is linked to this cli ma tic event, as was hypoth e sized al ready by Regan (1914) and men tioned by Grande and East man (1986: p. 134).…”

Section: Notothenioid Evolution and Deterioration Of Climatementioning

confidence: 99%

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Eocene relatives of cod icefishes (Perciformes: Notothenioidei) from Seymour Island, Antarctica

Bieńkowska-Wasiluk

Bonde

Gaździcki

2013

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Eocene climate record of a high southern latitude continental shelf: Seymour Island, Antarctica

Cited by 156 publications

References 58 publications

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

Seasonality fluctuations recorded in fossil bivalves during the early Pleistocene: Implications for climate change

Eocene relatives of cod icefishes (Perciformes: Notothenioidei) from Seymour Island, Antarctica

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