Mid-Cretaceous pCO2 based on stomata of the extinct conifer Pseudofrenelopsis (Cheirolepidiaceae)

Haworth, Matthew; Hesselbo, Stephen P.; McElwain, Jennifer C.; Robinson, Stuart A.; Brunt, J.

doi:10.1130/g21736.1

Cited by 104 publications

(57 citation statements)

References 32 publications

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“…In part constrained by the observational and experimental data discussed previously and other considerations, numerous models have been constructed to estimate changes in atmospheric carbon dioxide partial pressure (pCO 2 ) during the Phanerozoic Eon (e.g., Berner et al ., 1983;Mora et al ., 1996;Pearson and Palmer, 2000;Wallmann, 2001;Nordt et al ., 2002;Demicco et al ., 2003;Edmond and Huh, 2003;Hansen and Wallmann, 2003;Royer et al ., 2004;Haworth et al ., 2005;Guidry et al . 2007;Mackenzie et al ., 2008;Arvidson et al ., 2006Arvidson et al ., , 2011Berner, 2004Berner, , 2006Royer, 2006;Li and Elderfield, 2013) .…”

Section: Initial Considerationsmentioning

confidence: 99%

The Marine Carbon System and Ocean Acidification during Phanerozoic Time

Mackenzie¹,

Andersson²

2013

geochempersp

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Section: Initial Considerationsmentioning

confidence: 99%

The Marine Carbon System and Ocean Acidification during Phanerozoic Time

Mackenzie¹,

Andersson²

2013

geochempersp

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“…The higher the atmospheric concentration of carbon dioxide, the more sparsely stomata develop on the leaf surface. Studying the stomata density on fossil leaves provides a method for estimating past carbon dioxide concentrations (McElwain 1998 ;McElwain et al 1995McElwain et al , 2002Haworth et al 2005 ).…”

Section: The Journey Onto Landmentioning

confidence: 99%

The Evolution of Photosynthesis and Its Environmental Impact

Björn

2014

Photobiology

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“…Recently it has been suggested that climate and consequent temperature variations during the Aptian were just a matter of a very few degrees and that pCO 2 changes were of minor importance only (e.g. Haworth et al, 2005). In such cases, one would assume minor environmental changes on the shelves.…”

Section: Regional-to-global Significance Of the Isotope Recordmentioning

confidence: 99%

Shallow water carbonate platforms (Late Aptian–Early Albian, Southern Apennines) in the context of supraregional to global changes: re-appraisal of palaeoecological events as reflectors of carbonate factory response

Raspini

2012

Solid Earth

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Abstract. This paper discusses the palaeoenvironmental significance of the "Orbitolina Level", the microbial carbonates and the Salpingoporella dinarica-rich deposits encased in the Aptian/Albian shallow water carbonate platform strata of Monte Tobenna and Monte Faito (Southern Italy). These facies show a peculiar field appearance due to their color and/or fossil content. In the shallow water carbonate strata, the Late Aptian "Orbitolina Level" was formed during a period of decreasing accommodation space. Microbial carbonates occur in different levels in the composite section. They reach their maximum thickness around the sequence boundaries just above the "Orbitolina Level" and close to the AptianAlbian transition, and were not deposited during maximum flooding. S. dinarica-rich deposits occur in the lower part of the Monte Tobenna-Monte Faito composite section, in both restricted and more open lagoonal sediments. S. dinarica has its maximum abundance below the "Orbitolina Level" and disappears 11 m above this layer.On the basis of δ 13 C and δ 18 O values recorded at TobennaFaito, the succession has been correlated to global sea-level changes and to the main volcanic and climatic events during the Aptian. Deterioration of the inner lagoon environmental conditions was related to high trophic levels triggered by volcano-tectonic activity. Microbial carbonates were deposited especially in periods of third-order sea level lowering. In such a scenario, periods of increased precipitation during the Gargasian induced the mobilization of clay during flooding of the exposed platform due to high-frequency sea-level changes, with consequent terrigenous input to the lagoon. This and the high nutrient levels made the conditions unsuitable for the principle carbonate producers, and an opportunistic biota rich in orbitolinids (Mesorbitolina texana and M. parva) populated the platform. In the more open marine domain, the increased nutrient input enhanced the production of organic matter and locally led to the formation of black shales (e.g. the Niveau Fallot in the Vocontian Basin).It is argued that the concomitant low Mg/Ca molar ratio and high concentration of calcium in seawater could have favoured the development of the low-Mg calcite skeleton of the S. dinarica green algae.During third-order sea-level rise, no or minor microbial carbonates formed in the shallowlagoonal settings and S. dinarica disappeared. Carbonate neritic ecosystems were not influenced by the environmental changes inferred to have been induced by the mid-Cretaceous volcanism.The "Orbitolina Level", the microbial carbonates and the Salpingoporella dinarica-rich deposits in the studied Aptian/Albian shallow water carbonate strata are interpreted to be the response to environmental and oceanographic changes in shallow-water and deeper-marine ecosystems.

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Mid-Cretaceous pCO2 based on stomata of the extinct conifer Pseudofrenelopsis (Cheirolepidiaceae)

Cited by 104 publications

References 32 publications

The Marine Carbon System and Ocean Acidification during Phanerozoic Time

The Marine Carbon System and Ocean Acidification during Phanerozoic Time

The Evolution of Photosynthesis and Its Environmental Impact

Shallow water carbonate platforms (Late Aptian–Early Albian, Southern Apennines) in the context of supraregional to global changes: re-appraisal of palaeoecological events as reflectors of carbonate factory response

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