Influence of Changing Hydrology on Pedogenic Calcite Precipitation in Vertisols, Dance Bayou, Brazoria County, Texas, U.S.A.: Implications for Estimating Paleoatmospheric PCO2

Mintz, Jason S.; Driese, Steven G.; Breecker, Daniel O.; Ludvigson, Greg A.

doi:10.2110/jsr.2011.36

Cited by 35 publications

(11 citation statements)

References 32 publications

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“…Though NG15 does not contain Vertisols, occasional waterlogging may simulate the poorly drained phase common in Vertisols. The Mintz et al (2011) model of carbonate precipitation is in line with our interpretation of a C 4 biomass isotopic signature on the δ 13 C values measured for NG15: specifically, that the carbonates in NG15 formed during well-drained conditions in equilibrium with fully terrestrial aboveground biomass. If, however, bicarbonate-fixing semiaquatic vegetation were present at the time of carbonate precipitation, C 4 vegetation would not be necessary to account for the very positive values observed (e.g., Rascio, 2002).…”

Section: Florasupporting

confidence: 87%

“…Modern hydromorphic Vertisols have been shown to precipitate carbonate during a range of hydrologic conditions, from fully saturated to well-drained (Mintz et al, 2011). In such soils, δ 13 C values of authigenic carbonate phases tend to be more positive when calcite precipitates during welldrained conditions as a result of actively growing C 4 biomass and higher rates of atmospheric CO 2 diffusion into soil pore space (Cerling, 1991).…”

Section: Floramentioning

confidence: 99%

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The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

et al. 2017

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Early Miocene outcrops near Karungu, Western Kenya, preserve a range of fluvio-lacustrine, lowland landscapes that contain abundant fossils of terrestrial and aquatic vertebrates. Primates are notably rare among these remains, although nearby early Miocene strata on Rusinga Island contain a rich assemblage of fossilized catarrhines and strepsirrhines. To explore possible environmental controls on the occurrence of early Miocene primates, we performed a deep-time Critical Zone (DTCZ) reconstruction focused on floodplain paleosols at the Ngira locality in Karungu. We specifically focused on a single stratigraphic unit (NG15), which preserves moderately developed paleosols that contain a microvertebrate fossil assemblage. Although similarities between deposits at Karungu and Rusinga Island are commonly assumed, physical sedimentary processes, vegetative cover, soil hydrology, and some aspects of climate state are notably different between the two areas. Estimates of paleoclimate parameters using paleosol B horizon elemental chemistry and morphologic properties are consistent with seasonal, dry subhumid conditions, occasional waterlogging, and herbaceous vegetation. The reconstructed small mammal community indicates periodic waterlogging and open-canopy conditions. Based on the presence of herbaceous root traces, abundant microcharcoal, and pedogenic carbonates with high stable carbon isotope ratios, we interpret NG15 to have formed under a warm, seasonally dry, open riparian woodland to wooded grassland, in which at least a subset of the vegetation was likely C 4 biomass. Our results, coupled with previous paleoenvironmental interpretations for deposits on Rusinga Island, demonstrate that there was considerable environmental heterogeneity ranging from open to closed habitats in the early Miocene. We hypothesize that the relative paucity of primates at Karungu was driven by their environmental preference for locally abundant closed canopy vegetation, which was likely absent at Karungu, at least during the NG15 interval if not also earlier and later intervals that have not yet been studied in as much detail.

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Section: Florasupporting

confidence: 87%

Section: Floramentioning

confidence: 99%

The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

et al. 2017

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“…The only carbonate nodule sampled from a black paleosol (BB‐TF2‐14‐030) exhibited a radial fabric and has a relatively high clumped isotope temperature (48 ± 14 °C). Carbonate nodules from black paleosols in this formation were previously excluded from δ 13 C chemostratigraphy because these paleosols indicate carbonate growth in a water‐saturated environment where the carbonates might incorporate a higher contribution of carbon from respired soil CO 2 compared to carbonate nodules from other soils in the section (Bataille et al, ; Mintz et al, ). The carbonate growth process is poorly understood in Histosol‐like soils such as the black paleosols in the Black Peaks Formation and could involve disequilibrium processes, so we also exclude this nodule from our climate reconstruction.…”

Section: Discussionmentioning

confidence: 99%

Warm Terrestrial Subtropics During the Paleocene and Eocene: Carbonate Clumped Isotope (Δ₄₇) Evidence From the Tornillo Basin, Texas (USA)

Kelson

Watford

Bataille

et al. 2018

Paleoceanog and Paleoclimatol

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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 (δ13C, δ18O, and Δ47) 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 Δ47 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 δ18O 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 δ18O values likely relates to a rise in atmospheric pCO2, although we cannot rule out that changes in paleosol texture and regional precipitation patterns also influence the record. Comparison with Δ47 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.

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“…Calcite precipitation can happen during the period of water saturation or well-drained condition during a year. Studies have shown that the cold dry period with well-drained soil condition induces high soil respiration which is registered as enriched δ 13 C values in the soil carbonates 29 . In contrast, warm wet conditions dampen the rate of soil respiration, which is registered as lighter δ 13 C values in the soil carbonates 29 .…”

Section: Clumped Isotope Analysesmentioning

confidence: 99%

“…Studies have shown that the cold dry period with well-drained soil condition induces high soil respiration which is registered as enriched δ 13 C values in the soil carbonates 29 . In contrast, warm wet conditions dampen the rate of soil respiration, which is registered as lighter δ 13 C values in the soil carbonates 29 . A close inspection of the δ 13 C, δ 18 O and deduced Mean Annual Air Temperature (MAAT) for the samples suggests seasonal deposition of Lameta and Bagra soil calcite (Extended Data Fig.…”

Section: Clumped Isotope Analysesmentioning

confidence: 99%

Tracking the migration of the Indian continent using the carbonate clumped isotope technique on Phanerozoic soil carbonates

Ghosh

Vasiliev

Ghosh

et al. 2016

Sci Rep

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Approximately 140 million years ago, the Indian plate separated from Gondwana and migrated by almost 90° latitude to its current location, forming the Himalayan-Tibetan system. Large discrepancies exist in the rate of migration of Indian plate during Phanerozoic. Here we describe a new approach to paleo-latitudinal reconstruction based on simultaneous determination of carbonate formation temperature and δ18O of soil carbonates, constrained by the abundances of 13C-18O bonds in palaeosol carbonates. Assuming that the palaeosol carbonates have a strong relationship with the composition of the meteoric water, δ18O carbonate of palaeosol can constrain paleo-latitudinal position. Weighted mean annual rainfall δ18O water values measured at several stations across the southern latitudes are used to derive a polynomial equation: δ18Ow = −0.006 × (LAT)2 − 0.294 × (LAT) − 5.29 which is used for latitudinal reconstruction. We use this approach to show the northward migration of the Indian plate from 46.8 ± 5.8°S during the Permian (269 M.y.) to 30 ± 11°S during the Triassic (248 M.y.), 14.7 ± 8.7°S during the early Cretaceous (135 M.y.), and 28 ± 8.8°S during the late Cretaceous (68 M.y.). Soil carbonate δ18O provides an alternative method for tracing the latitudinal position of Indian plate in the past and the estimates are consistent with the paleo-magnetic records which document the position of Indian plate prior to 135 ± 3 M.y.

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Influence of Changing Hydrology on Pedogenic Calcite Precipitation in Vertisols, Dance Bayou, Brazoria County, Texas, U.S.A.: Implications for Estimating Paleoatmospheric PCO2

Cited by 35 publications

References 32 publications

The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

Warm Terrestrial Subtropics During the Paleocene and Eocene: Carbonate Clumped Isotope (Δ₄₇) Evidence From the Tornillo Basin, Texas (USA)

Tracking the migration of the Indian continent using the carbonate clumped isotope technique on Phanerozoic soil carbonates

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Influence of Changing Hydrology on Pedogenic Calcite Precipitation in Vertisols, Dance Bayou, Brazoria County, Texas, U.S.A.: Implications for Estimating Paleoatmospheric PCO2

Cited by 35 publications

References 32 publications

The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

The Early Miocene Critical Zone at Karungu, Western Kenya: An Equatorial, Open Habitat with Few Primate Remains

Warm Terrestrial Subtropics During the Paleocene and Eocene: Carbonate Clumped Isotope (Δ47) Evidence From the Tornillo Basin, Texas (USA)

Tracking the migration of the Indian continent using the carbonate clumped isotope technique on Phanerozoic soil carbonates

Contact Info

Product

Resources

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Warm Terrestrial Subtropics During the Paleocene and Eocene: Carbonate Clumped Isotope (Δ₄₇) Evidence From the Tornillo Basin, Texas (USA)