Geochemistry, Geophysics, Geosystems

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    4. Review Article
    5. Technical Briefs
    1. You have free access to this content
      Influence of provenance and preservation on the carbon isotope variations of dispersed organic matter in ancient floodplain sediments (pages 4874–4891)

      Clément P. Bataille, Maria Mastalerz, Brett J. Tipple and Gabriel J. Bowen

      Version of Record online: 15 NOV 2013 | DOI: 10.1002/ggge.20294

      Key Points

      • d13C values of organic matter from paleosols show anomalous variations
      • Provenance and alteration of organic fractions influence d13C anomaly
      • Implications for using d13C for paleoenvironmental reconstruction
    2. You have full text access to this OnlineOpen article
      Masking of interannual climate proxy signals by residual tropical cyclone rainwater: Evidence and challenges for low-latitude speleothem paleoclimatology (pages 3632–3647)

      Amy Benoit Frappier

      Version of Record online: 20 SEP 2013 | DOI: 10.1002/ggge.20218

      Key Points

      • Tropical cyclone rain lowers stalagmite d18O values months-years after storms
      • Tropical cyclone masking modulates accuracy of speleothem d18O rain data
      • Stalagmite d13C values preserve climate structures of stormy periods
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      Quantifying and understanding the uncertainty of atmospheric CO2 concentrations determined from calcic paleosols (pages 3210–3220)

      D. O. Breecker

      Version of Record online: 29 AUG 2013 | DOI: 10.1002/ggge.20189

      Key Points

      • Paleosol-estimated CO2 uncertainty was quantified with a Monte Carlo approach
      • Uncertainties are minimized when S(z) and atmospheric CO2 are nearly equal
      • Weakly developed soils may result in most precise icehouse CO2 estimates
    4. You have full text access to this OnlineOpen article
      Degradation of mangrove tissues by arboreal termites (Nasutitermes acajutlae) and their role in the mangrove C cycle (Puerto Rico): Chemical characterization and organic matter provenance using bulk δ13C, C/N, alkaline CuO oxidation-GC/MS, and solid-state 13C NMR (pages 3176–3191)

      Christopher H. Vane, Alexander W. Kim, Vicky Moss-Hayes, Colin E. Snape, Miguel Castro Diaz, Nicole S. Khan, Simon E. Engelhart and Benjamin P. Horton

      Version of Record online: 28 AUG 2013 | DOI: 10.1002/ggge.20194

      Key Points

      • Termites cause significant loss of cellulose in mangroves
      • Termites nests are enriched in lignin
      • Termites nests comprise about 2 % of total C in mangroves
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      Temporal variability of in situ methane concentrations in gas hydrate-bearing sediments near Bullseye Vent, Northern Cascadia Margin (pages 2445–2459)

      Laura Lapham, Rachel Wilson, Michael Riedel, Charles K. Paull and M. Elizabeth Holmes

      Version of Record online: 30 JUL 2013 | DOI: 10.1002/ggge.20167

      Key Points

      • Pore-waters near the sediment-water interface were nearly saturated with methane
      • Methane concentrations in overlying water and pore-waters vary over time
      • No direct correlation between methane flux and earthquake activity was found
    6. You have free access to this content
      New views on “old” carbon in the Amazon River: Insight from the source of organic carbon eroded from the Peruvian Andes (pages 1644–1659)

      K. E. Clark, R. G. Hilton, A. J. West, Y. Malhi, D. R. Gröcke, C. L. Bryant, P. L. Ascough, A. Robles Caceres and M. New

      Version of Record online: 31 MAY 2013 | DOI: 10.1002/ggge.20122

      Key Points

      • Enrichment of soil and vegetation content at peak floods in Andean Rivers
      • Fossil particulate organic carbon a significant presence in Andean river POC
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      Reconstructing the environmental conditions around the Silurian Ireviken Event using the carbon isotope composition of bulk and palynomorph organic matter (pages 86–101)

      Thijs R. A. Vandenbroucke, Axel Munnecke, Melanie J. Leng, Torsten Bickert, Olle Hints, David Gelsthorpe, Georg Maier and Thomas Servais

      Version of Record online: 31 JAN 2013 | DOI: 10.1029/2012GC004348

      Key Points

      • In Lusklint1, d13Cwhole rock is consistently higher than d13Cchit and d13Cscol
      • There is a 1 permil drop in d13Corg 2 m below the base the Upper Visby Formation
      • Palynomorph d13C suggest increased primary productivity prior to Ireviken event
  2. Research Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    4. Review Article
    5. Technical Briefs
    1. You have free access to this content
      Sensitivity of sediment geochemical proxies to coring location and corer type in a large lake: Implications for paleolimnological reconstruction (pages 1960–1976)

      Yue Han Lu, Philip A. Meyers, John A. Robbins, Brian J. Eadie, Nathan Hawley and Kang Hyeun Ji

      Version of Record online: 29 MAY 2014 | DOI: 10.1002/2013GC004989

      Key Points

      • Geochemical proxies in five sediment cores from Lake Erie were compared
      • Geochemical record was sensitive to coring location and corer type
      • Multiple cores are necessary for reliable paleolimnological reconstruction
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      A novel framework for quantifying past methane recycling by Sphagnum-methanotroph symbiosis using carbon and hydrogen isotope ratios of leaf wax biomarkers (pages 1827–1836)

      Jonathan E. Nichols, Peter D. F. Isles and Dorothy M. Peteet

      Version of Record online: 27 MAY 2014 | DOI: 10.1002/2014GC005242

      Key Points

      • D/H and 13C/12C ratios of leaf waxes constrain proportion recycled methane in Sphagnum
      • High water table supports increased Sphagnum methane recycling
      • Methane transport through sedge aerenchyma inhibits methane recycling
    3. You have full text access to this OnlineOpen article
      Interpreting bryophyte stable carbon isotope composition: Plants as temporal and spatial climate recorders (pages 1462–1475)

      Jessica Royles, Aline B. Horwath and Howard Griffiths

      Version of Record online: 29 APR 2014 | DOI: 10.1002/2013GC005169

      Key Points

      • C isotopes provide an assimilation-weighted summary of bryophyte physiology
      • Moss isotope values show most C gain that occurs close to optimal water content
      • Thalloid liverworts are less sensitive to environmental variation than mosses
  3. Review Article

    1. Top of page
    2. Regular Articles
    3. Research Articles
    4. Review Article
    5. Technical Briefs
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      Why are the δ13Corg values in Phanerozoic black shales more negative than in modern marine organic matter? (pages 3085–3106)

      Philip A. Meyers

      Version of Record online: 12 JUL 2014 | DOI: 10.1002/2014GC005305

      Key Points

      • Photic zone recycling of organic carbon is responsible for their low δ13C values
      • Black shales deposited during periods of strong surface ocean stratification
      • Periods of greenhouse climate established conditions for black shale deposition
  4. Technical Briefs

    1. Top of page
    2. Regular Articles
    3. Research Articles
    4. Review Article
    5. Technical Briefs
    1. You have free access to this content
      Determination of B/Ca of natural carbonates by HR-ICP-MS (pages 1617–1628)

      Sambuddha Misra, Mervyn Greaves, Robert Owen, Joanna Kerr, Aurora C. Elmore and Henry Elderfield

      Version of Record online: 2 APR 2014 | DOI: 10.1002/2013GC005049

      Key Points

      • B/Ca and Me/Ca determination from <5 µg CaCO3
      • External precision <4.0% (2σ) on B/Ca
      • Analysis of Me/Ca from single foraminifera shell
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      Sedimentary process control on carbon isotope composition of sedimentary organic matter in an ancient shallow-water shelf succession

      S. J. Davies, M. J. Leng, J. H. S. Macquaker and K. Hawkins

      Version of Record online: 7 NOV 2012 | DOI: 10.1029/2012GC004218

      Key Points

      • D13C values of sedimentary organic matter relate to source and delivery process
      • D13C values track changing proportions of terrestrial and marine organic matter
      • Implications for bulk organic matter in identifying global C-isotope excursions
    2. You have free access to this content
      An experimental evaluation of the use of C3δ13C plant tissue as a proxy for the paleoatmospheric δ13CO2 signature of air

      B. H. Lomax, C. A. Knight and J. A. Lake

      Version of Record online: 20 SEP 2012 | DOI: 10.1029/2012GC004174

      Key Points

      • Carbon isotope plant values show weak correlation to atmospheric CO2 isotope values
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      An assessment of geochemical preparation methods prior to organic carbon concentration and carbon isotope ratio analyses of fine-grained sedimentary rocks

      Sven F. Könitzer, Melanie J. Leng, Sarah J. Davies and Michael H. Stephenson

      Version of Record online: 13 SEP 2012 | DOI: 10.1029/2012GC004094

      Key Points

      • Acid treatment of geological sample material to remove carbonate
      • Test for extraneous hydrocarbons using stable carbon isotope ratios
      • Examining drilling mud contamination using stable carbon isotope ratios
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      Experimental assessment of the purity of α-cellulose produced by variations of the Brendel method: Implications for stable isotope (δ13C, δ18O) dendroclimatology

      Tom Brookman and Thomas Whittaker

      Version of Record online: 11 SEP 2012 | DOI: 10.1029/2012GC004215

      Key Points

      • SBrendel variations dealt with extraction requirements of resinous species
      • Reaction time, reagent amount, and temperature all affect SBrendel's efficacy
      • C and O isotope ratios potentially suspect without testing cellulose purity
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      Are two elements better than one? Dual isotope-ratio detrending of evaporative effects on lake carbonate paleoelevation proxies

      Travis W. Horton and Christopher Oze

      Version of Record online: 22 JUN 2012 | DOI: 10.1029/2012GC004132

      Key Points

      • Lake carbonate isotopic compositions do not reflect meteoric water compositions
      • Positive isotopic covariation enables detrending for evaporative effects
      • 13C-excess values are more robust than 18O alone