Paleoenvironmental implications of concentration and 13C/12C ratios of Fe(CO3)OH in goethite from a mid-latitude Cenomanian laterite in southwestern Minnesota

Feng, Weimin; Yapp, Crayton J.

doi:10.1016/j.gca.2009.02.004

Cited by 16 publications

(17 citation statements)

References 58 publications

(96 reference statements)

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“…Paleosol carbonate CO 2 estimates have been adjusted to reflect a soil CO 2 concentration of 2000 ppm (Breecker and others, 2009). Estimates from the goethite proxy (Yapp and Poths, 1996;Yapp, 2004;Tabor and Yapp, 2005;Feng and Yapp, 2009) are excluded due to poor knowledge of some of the isotopic fractionation factors (Rustad and Zarzycki, 2008). For Retallack (2009a), only data points associated with Ͼ4 cuticle fragments are included (Royer, 2003) and the stomatal ratio approach ) is used to estimate CO 2 for species other than Ginkgo adiantoides.…”

mentioning

confidence: 99%

Declining atmospheric CO2 during the late Middle Eocene climate transition

Doria¹,

Royer²,

Wolfe³

et al. 2011

American Journal of Science

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ABSTRACT. The transition from the extreme greenhouse of the early Paleogene (ϳ52 Ma) to the present-day icehouse is the most prominent change in Earth's Cenozoic climate history. During the late Middle Eocene climate transition (42-38 Ma), which preceded the onset of long-lived, continental-scale ice sheets, there is concordant evidence for brief pulses (<1 m.y. in length) of global warmth and ice sheet growth but few constraints on atmospheric CO 2 . Here we estimate the concentration of atmospheric CO 2 during this critical interval using stomatal indices of fossil Metasequoia needles from ten levels in an exceptionally well-preserved core from the Giraffe kimberlite locality in northwestern Canada. Reconstructed CO 2 concentrations are mainly between 700 to 1000 ppm, but include a secular decline to 450 ppm towards the top of the investigated section. Because the CO 2 threshold for nucleating continental ice sheets at this time was ϳ500 to 750 ppm, the CO 2 decline is compatible with a rapid (<10 4 yrs) transition from warm, largely ice-free conditions to cooler climates with ice sheets. These fossils provide direct evidence that high-latitude deciduous forests thrived in the geological past under CO 2 concentrations that will likely be reached within the 21 st century (500-1000 ppm).

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mentioning

confidence: 99%

Declining atmospheric CO2 during the late Middle Eocene climate transition

Doria¹,

Royer²,

Wolfe³

et al. 2011

American Journal of Science

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“…5) is anomalous when compared to published incremental dehydration-decarbonation experiments on natural and synthetic goethite samples that yield linear arrays of d 13 C values and mole fraction Fe(CO 3 )OH (Yapp, 2004 andRefs. therein, Tabor andYapp, 2005;Feng and Yapp, 2009). A linear array of d 13 C values and mole fraction Fe(CO 3 )OH data are a requisite for determining paleo-atmospheric pCO 2 from the Fe(CO 3 )-OH-goethite solid solution (Yapp and Poths, 1986;Yapp, 1987).…”

Section: Discussionmentioning

confidence: 99%

“…The mole fraction and d 13 C value of Fe(CO 3 )OH is a function of the partial pressure and d 13 C value of CO 2 in the immediate vicinity of the goethite crystallization surface Poths, 1991, 1992). As a result, goethite is one of only two minerals that is a proven proxy for determining the pCO 2 of ancient atmospheres (Yapp, 1987(Yapp, , 2004Tabor et al, 2004;Feng and Yapp, 2009). Carbon that is incorporated into the Fe(CO 3 )OHgoethite solid solution is derived from either (1) two-component admixtures of soil-respired CO 2 and atmospheric CO 2 or (2) three component mixtures that include CO 2 sources from the atmosphere, soil-respiration and dissolved calcite (Hsieh and Yapp, 1999;Feng and Yapp, 2008).…”

Section: Introductionmentioning

confidence: 99%

A pedogenic goethite record of soil CO2 variations as a response to soil moisture content

Gulbranson

Tabor

Montañez

2011

Geochimica et Cosmochimica Acta

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“…In the Cenomanian, the paleosol was in a coastal locale on the eastern side of the Western Interior Seaway (WIS) at a paleolatitude of $40°N (see Fig. 1 of Feng and Yapp (2009)) and was part of a fluvial system that drained into the WIS (Toth and Fritz, 1997). The fluvial sediments are associated with the Greenhorn cyclothem of the WIS (Toth and Fritz, 1997).…”

Section: Paleosol Samplesmentioning

confidence: 99%

“…1c) indicated that there might be more than one generation of goethite (Feng and Yapp, 2009). This reinforced the conclusion of Toth and Fritz (1997) that the lateritic paleosol experienced some degree of low temperature reductive diagenesis followed by re-oxidation.…”

Section: Paleosol Samplesmentioning

confidence: 99%