Estimates of atmospheric CO2 in the Neoarchean–Paleoproterozoic from paleosols

Kanzaki, Yoshiki; Murakami, Takashi

doi:10.1016/j.gca.2015.03.011

Cited by 80 publications

(86 citation statements)

References 139 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the total CO 2 concentration in 2.4 Ga seawater may have been lower than the present level. Such decrease in the total CO 2 concentration in seawater from 3.2 to 2.4 Ga is also consistent with the decrease in atmospheric pCO 2 from the late Archean to Paleoproterozoic estimated from the paleosols (Kanzaki and Murakami 2015).…”

Section: Secular Change Of Carbonate Content In the Altered Subseaflosupporting

confidence: 88%

“…Furthermore, the changes in albedos of the early Earth also had the potential to compensate the faint young Sun (Rosing et al 2010). However, comprehensive geological studies provide evidence suggesting that atmospheric CO 2 levels in the early Earth were substantially higher than at present: e.g., > 100 PAL at 3.8-1.8 Ga (Ohmoto et al 2004), > 100 PAL at 3.5-3.2 Ga (Lowe and Tice 2004), at > 7 PAL bar (25°C) at 3.2 Ga (Hessler et al 2004), 23×/÷3 PAL at 2.2 Ga (Sheldon 2006), 30-190 PAL at 2.15 Ga, and various other estimates for 2.77-1.85 Ga (Kanzaki and Murakami 2015).…”

Section: Introductionmentioning

confidence: 58%

See 1 more Smart Citation

Weak hydrothermal carbonation of the Ongeluk volcanics: evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciation

Shibuya

Komiya

Takai

et al. 2017

Prog Earth Planet Sci

View full text Add to dashboard Cite

It was previously revealed that the total CO 2 concentration in seawater decreased during the Late Archean. In this paper, to assess the secular change of total CO 2 concentration in seawater, we focused on the Paleoproterozoic era when the Earth experienced its first recorded global glaciation. The 2.4 Ga Ongeluk Formation outcrops in the Kaapvaal Craton, South Africa. The formation consists mainly of submarine volcanic rocks that have erupted during the global glaciation. The undeformed lavas are mostly carbonate-free but contain rare disseminated calcites. The carbon isotope ratio of the disseminated calcite (δ 13 C cc vs. VPDB) ranges from − 31.9 to − 13.2 ‰. The relatively low δ 13 C cc values clearly indicate that the carbonation was partially contributed by 13 C-depleted CO 2 derived from decomposition of organic matter beneath the seafloor. The absence of δ 13 C cc higher than − 13.2‰ is consistent with the exceptionally 13 C-depleted CO 2 in the Ongeluk seawater during glaciation. The results suggest that carbonation occurred during subseafloor hydrothermal circulation just after the eruption of the lavas. Previously, it was reported that the carbonate content in the uppermost subseafloor crust decreased from 3.2 to 2.6 Ga, indicating a decrease in total CO 2 concentration in seawater during that time. However, the average CO 2 (as carbonate) content in the Ongeluk lavas (< 0.001 wt%) is much lower than those of 2.6 Ga representatives and even of modern equivalents. This finding suggests that the total CO 2 concentration in seawater further decreased during the period between 2.6 and 2.4 Ga. Thus, the very low content of carbonate in the Ongeluk lavas is probable evidence for the extremely low CO 2 concentration in seawater during the global glaciation. Considering that the carbonate content of the subseafloor crusts also shows a good correlation with independently estimated atmospheric pCO 2 levels through the Earth history, it seem highly likely that the low carbonate content in the Ongeluk lavas reflects the low atmospheric pCO 2 at that time. We conclude that the continuous decrease in CO 2 concentration of seawater/atm. from 3.2 Ga was one of the contributing factors to the Paleoproterozoic global glaciation.

show abstract

Section: Secular Change Of Carbonate Content In the Altered Subseaflosupporting

confidence: 88%

Section: Introductionmentioning

confidence: 58%

Weak hydrothermal carbonation of the Ongeluk volcanics: evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciation

Shibuya

Komiya

Takai

et al. 2017

Prog Earth Planet Sci

View full text Add to dashboard Cite

show abstract

“…The effects of post depositional alteration (metamorphism and/or metasomatism) (cf., Macfarlane and Holland, 1991;Nesbitt, 1992;Fedo et al, 1995;Ohmoto, 1996;Novoselov and de Souza Filho, 2015;Teitler et al, 2015) on the five paleosols have been well constrained (cf., Murakami et al, 2011;Kanzaki and Murakami, 2015). The five paleosols have passed through a screen test of the absence and presence of significant physical and chemical disturbances .…”

Section: P O 2 Estimation Equation For Paleosolsmentioning

confidence: 99%

“…Kanzaki and Murakami (2015) have constrained the temperatures at which eight Neoarchean-Paleoproterozoic paleosols formed, including the above five Paleoproterozoic paleosols, mainly based on the relationships between temperature and solute composition in the literature. The estimates of temperature for the five Paleoproterozoic paleosols in Kanzaki and Murakami (2015) are listed in Table 3.…”

Section: Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Estimates of atmospheric O2 in the Paleoproterozoic from paleosols

Kanzaki

Murakami

2016

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

Geochemistry and microbial community composition across a range of acid mine drainage impact and implications for the Neoarchean‐Paleoproterozoic transition

2017

View full text Add to dashboard Cite

Streams impacted by acid mine drainage (AMD, also known as acid rock drainage) represent local environmental and ecological disasters; however, they may also present an opportunity to study microbial communities in environments analogous to past conditions. Neoarchean continents had streams and rivers replete with detrital pyrites. Following the emergence of oxygenic photosynthesis, Cyanobacteria colonized streams and rivers on continental surfaces. The combination of labile detrital pyrite grains and locally produced O2 generated by Cyanobacteria produced ideal conditions for pyrite oxidation similar to that found at modern AMD‐impacted sites. To explore the connection of modern sites to ancient conditions, we sampled sites that exhibited a range of AMD‐impact (e.g., pH from 2.1 to 7.9 [Fe2+] up to 5.2 mmol/L [SO42−] from 0.3 to 52.4 mmol/L) and found (i) nearly all analytes correlated to sulfate concentration; (ii) all sites exhibited the predominance of a single taxon most closely related to Ferrovum myxofaciens, an Fe‐oxidixing betaproteoabacterium capable of carbon and nitrogen fixation, and (iii) signs of potential inorganic carbon limitation and nitrogen cycling. From these findings and building on the work of others, we present a conceptual model of continental surfaces during the Neoarchean and Paleoproterozoic linking local O2 production to pyrite oxidation on continental surfaces to sulfate production and delivery to nearshore environments. The delivery of sulfate drives sulfate reduction and euxinia—favoring anoxygenic photosynthesis over cyanobacterial O2 generation in near‐continent/shelf marine environments.

show abstract

Estimates of atmospheric CO2 in the Neoarchean–Paleoproterozoic from paleosols

Cited by 80 publications

References 139 publications

Weak hydrothermal carbonation of the Ongeluk volcanics: evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciation

Weak hydrothermal carbonation of the Ongeluk volcanics: evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciation

Estimates of atmospheric O2 in the Paleoproterozoic from paleosols

Geochemistry and microbial community composition across a range of acid mine drainage impact and implications for the Neoarchean‐Paleoproterozoic transition

Contact Info

Product

Resources

About