(Table 1) Isotopic composition of organic compinents of DSDP Hole 24-231
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2013
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| _version_ | 1867168142136967168 |
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| author | Feakins, Sarah J |
| author_facet | Feakins, Sarah J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Plant leaf wax hydrogen isotope (dDwax) reconstructions are increasingly being used to reconstruct hydrological change. This approach is based upon the assumption that variations in hydroclimatic variables, and in particular, the isotopic composition of precipitation (dDP), dominate dDwax. However modern calibration studies suggest that offsets between plant types may bias the dDwax hydrological proxy at times of vegetation change. In this study, I pair leaf wax analyses with published pollen data to quantify this effect and construct the first vegetation-corrected hydrogen isotopic evidence for precipitation (dDcorrP). In marine sediments from Deep Sea Drilling Program Site 231 in the Gulf of Aden spanning 11.4-3.8 Ma (late Miocene and earliest Pliocene), I find 77 per mil swings in dDwax that correspond to pollen evidence for substantial vegetation change. Similarities between dDP and dDcorrP imply that the hydrological tracer is qualitatively robust to vegetation change. However, computed vegetation corrections can be as large as 31 per mil indicating substantial quantitative uncertainty in the raw hydrological proxy. The resulting dDcorrP values quantify hydrological change and allow us to identify times considerably wetter than modern at 11.09, 7.26, 5.71 and 3.89 Ma. More generally, this novel interpretative framework builds the foundations of improved quantitative paleohydrological reconstructions with the dDwax proxy, in contexts where vegetation change may bias the plant-based proxy. The vegetation corrected paleoprecipitation reconstruction dDcorrP, represents the best available estimate as proof-of-concept, for an approach that I hope will be refined and more broadly applied. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811734 |
| institution | PANGAEA |
| language | en |
| publishDate | 2013 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Isotopic composition of organic compinents of DSDP Hole 24-231 Feakins, Sarah J 24-231; AGE; Carbon, organic, total; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Indian Ocean/Gulf of Aden/BASIN; Leg24; n-Alkanoic acid C28, δ13C; n-Alkanoic acid C28, δ13C, standard deviation; n-Alkanoic acid C28, δ2H, standard deviation; n-Alkanoic acid C28, δD; n-Alkanoic acid C30, δ13C; n-Alkanoic acid C30, δ13C, standard deviation; n-Alkanoic acid C30, δ2H, standard deviation; n-Alkanoic acid C30, δD; Replicates; Sample code/label; δ13C, organic carbon Plant leaf wax hydrogen isotope (dDwax) reconstructions are increasingly being used to reconstruct hydrological change. This approach is based upon the assumption that variations in hydroclimatic variables, and in particular, the isotopic composition of precipitation (dDP), dominate dDwax. However modern calibration studies suggest that offsets between plant types may bias the dDwax hydrological proxy at times of vegetation change. In this study, I pair leaf wax analyses with published pollen data to quantify this effect and construct the first vegetation-corrected hydrogen isotopic evidence for precipitation (dDcorrP). In marine sediments from Deep Sea Drilling Program Site 231 in the Gulf of Aden spanning 11.4-3.8 Ma (late Miocene and earliest Pliocene), I find 77 per mil swings in dDwax that correspond to pollen evidence for substantial vegetation change. Similarities between dDP and dDcorrP imply that the hydrological tracer is qualitatively robust to vegetation change. However, computed vegetation corrections can be as large as 31 per mil indicating substantial quantitative uncertainty in the raw hydrological proxy. The resulting dDcorrP values quantify hydrological change and allow us to identify times considerably wetter than modern at 11.09, 7.26, 5.71 and 3.89 Ma. More generally, this novel interpretative framework builds the foundations of improved quantitative paleohydrological reconstructions with the dDwax proxy, in contexts where vegetation change may bias the plant-based proxy. The vegetation corrected paleoprecipitation reconstruction dDcorrP, represents the best available estimate as proof-of-concept, for an approach that I hope will be refined and more broadly applied. |
| title | (Table 1) Isotopic composition of organic compinents of DSDP Hole 24-231 |
| topic | 24-231; AGE; Carbon, organic, total; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Indian Ocean/Gulf of Aden/BASIN; Leg24; n-Alkanoic acid C28, δ13C; n-Alkanoic acid C28, δ13C, standard deviation; n-Alkanoic acid C28, δ2H, standard deviation; n-Alkanoic acid C28, δD; n-Alkanoic acid C30, δ13C; n-Alkanoic acid C30, δ13C, standard deviation; n-Alkanoic acid C30, δ2H, standard deviation; n-Alkanoic acid C30, δD; Replicates; Sample code/label; δ13C, organic carbon |
| url | https://doi.org/10.1594/PANGAEA.811734 |