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• W2896967104 endingPage "1249" @default.
• W2896967104 startingPage "1230" @default.
• W2896967104 abstract "Abstract Records of subtropical climate on land from the early Paleogene offer insights into how the Earth system responds to greenhouse climate conditions. Fluvial and floodplain deposits of the Tornillo Basin (Big Bend National Park, Texas, USA) preserve a record of environmental and climatic change of the Paleocene and the early Eocene. We report carbon, oxygen, and clumped isotopic compositions (δ 13 C, δ 18 O, and Δ 47 ) of paleosol carbonate nodules from this basin. Mineralogical, geochemical, and thermal modeling evidence suggests that the measured isotopic values preserve primary environmental signals with a summer bias with the exception of data from two nodules reset by local igneous intrusions. The unaltered nodules record Δ 47 temperatures of 25 ± 4 and 32 ± 2 °C for the Paleocene and early Eocene nodules, respectively, showing an increase in average summer temperatures of 7 ± 3 °C. Calculations of δ 18 O of soil water are −2.8 ± 0.7‰ and −0.8 ± 0.4‰ (standard mean ocean water) for the early‐mid‐Paleocene and late Paleocene‐early Eocene, showing an increase of 2.0 ± 0.9‰. The increase in temperature and δ 18 O values likely relates to a rise in atmospheric p CO 2 , although we cannot rule out that changes in paleosol texture and regional precipitation patterns also influence the record. Comparison with Δ 47 estimates of summer temperature from the Green River and Bighorn Basins (WY) highlights that terrestrial surface temperatures are heterogeneous, and latitudinal temperature gradients on land remain undetermined. Previously published paleoclimate models predict summer temperatures that are 2 to 6 °C higher than our estimate; discrepancies between climate models and proxy data persist at lower latitudes." @default.
• W2896967104 created "2018-10-26" @default.
• W2896967104 creator A5008005216 @default.
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• W2896967104 creator A5069257605 @default.
• W2896967104 date "2018-11-01" @default.
• W2896967104 modified "2023-10-15" @default.
• W2896967104 title "Warm Terrestrial Subtropics During the Paleocene and Eocene: Carbonate Clumped Isotope (Δ ₄₇ ) Evidence From the Tornillo Basin, Texas (USA)" @default.
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