TABLE 2 - uploaded by Neil Tabor
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Paleosol morphology and geochemistry in sedimentary strata have accumulated to produce a high resolution record of Permo-Triassic (PT) paleoclimate and paleoenvironments that spans a large swath of the African continent. This geographically-extensive dataset records changes in climate during a major mass extinction event and time of terrestrial env...
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... the stable carbon isotope data from well-drained paleosol pro- files containing pedogenic carbonate untainted by diagenetic tex- tures or mineralogies are presented here (Tabor and Myers, 2015;Michel et al., 2016;Tabor et al., 2017). These paleosol data consist of 125 paired calcite-organic matter d 13 C values that are binned chronostratigraphically into the early Permian, late Permian, and Early to Middle Triassic (Table 2). ...
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... subscript (cc) indicates calcite; d 13 C CC is the measured d 13 C value of pedogenic calcite (d 13 C CC in Tables 1 and 2). The d 13 C values subscripted with 'A' and 'O' are predicted d 13 C val- ues of calcite if formed solely in equilibrium with CO 2 derived from the atmosphere and from oxidation of soil matter (i.e., respired CO 2 ; equivalent to S(z) in Equation 1), respectively. ...
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... e 13 CC-CO2 is equivalent to the quantity defined in Equa- tion 2 and d 13 C OM represents the d 13 C values of organic matter reported in Tables 1 and 2. The variable a k is the ratio of the soil diffusion coefficients of the CO 2 molecules with mass numbers 44 and 45 ( 44 D/ 45 D). ...
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... Series S (z) ppmv PCO 2 @15 C PCO 2 @25 C PCO 2 @35 C PCO 2 @45 C Aco 1000 325 410 494 579 Aco 2500 813 1025 1236 1447 Ager 1000 1 82 162 243 Ager 2500 2 In these respects, the vast majority of the variability of soil cal- cite d 13 C values, and the observed D 13 C cc-om range of the modern California soil data set, reflect changes in soil-respired CO 2 con- centrations across the recent landscapes at the time of calcite crystallization and not global atmospheric CO 2 changes ( Tabor et al., 2013b). Yet, this data set documents a range of D 13 C cc-om values such that, under the prescribed conditions of soil-respired pCO 2 for soils ( Breecker et al., 2009) and paleosols (Breecker et al., 2010), correspond to a range of atmospheric pCO 2 values ranging from less than 100 to 2200 ppm V may be estimated, a range nearly equivalent to atmospheric pCO 2 estimates for the entire Phanerozoic as estimated in Breecker and others (2010). ...
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... lower Permian stratigraphic section measured in the east- ern Midland Basin in north-central Texas ranges from Wolfcam- pian through upper Leonardian (»300-275 Ma; Monta~ nez et al., 2007). In this stratigraphic succession, the overall pattern of MAP inferred from D 13 C cc-om values is somewhat irregular but defines a long-term trend toward lower MAP estimates, which range from highs near »30 cm in the Wolfcampian to <10 cm in upper Leonardian strata ( Table 2). The lower Permian strata sampled in Oklahoma, New Mexico, and Utah are all Wolfcam- pian-aged and correlate with the lower half of the Texas strati- graphic section (Table 2). ...
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... this stratigraphic succession, the overall pattern of MAP inferred from D 13 C cc-om values is somewhat irregular but defines a long-term trend toward lower MAP estimates, which range from highs near »30 cm in the Wolfcampian to <10 cm in upper Leonardian strata ( Table 2). The lower Permian strata sampled in Oklahoma, New Mexico, and Utah are all Wolfcam- pian-aged and correlate with the lower half of the Texas strati- graphic section (Table 2). Decreasing MAP estimates from the Wolfcampian strata of Oklahoma and New Mexico range from »30 to 20 cm, describing a pattern similar to that observed in correlative Texas strata (Table 2; Fig. 5A, B). ...
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... lower Permian strata sampled in Oklahoma, New Mexico, and Utah are all Wolfcam- pian-aged and correlate with the lower half of the Texas strati- graphic section (Table 2). Decreasing MAP estimates from the Wolfcampian strata of Oklahoma and New Mexico range from »30 to 20 cm, describing a pattern similar to that observed in correlative Texas strata (Table 2; Fig. 5A, B). MAP levels inferred from Wolfcampian paleosols in the Paradox Basin in southern Utah, the most northerly lower Permian site in the southwestern U.S.A., are relatively low and stable, with all esti- mates <13 cm. ...
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... estimates from the upper Permian Quanzijie and Tao- dongguo formations (Turpan Basin, China) range from 23 to 41 cm (avg. D 31 § 7 cm), remaining relatively low until they begin to increase near the top of the Taodongguo Formation (Table 2; Fig. 5C). MAP estimates from the Ikakern Formation (Argana Basin, Morocco) vary from 19.2 to 32.9 cm (avg. ...
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... lower-Middle Triassic MAP estimates from the Jaicuiyuan Formation (Turpan Basin) range from 46 to 51 cm (avg. D 48 § 3 cm; Table 2), substantially higher than the lower and upper Permian estimates from the same basin. Paleosols from the Teloua Formation (Tim Mersoi Basin) yield MAP estimates that vary from 33 to 40 cm (avg. ...
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