Vol. 306, Issue 5, 2006 | Published by American Journal of Science

Science Paper
Inclusion of the Weathering of Volcanic Rocks in the GEOCARBSULF Model
Robert A. Berner
The carbon cycle model GEOCARBSULF is extended by dividing the weathering of silicates into volcanic and non-volcanic rocks. The proportion of volcanic weathering is calculated as a function of time...
Science Paper
Geology, Age and Origin of Supracrustal Rocks at Akilia, West Greenland
Craig E. ManningStephen J. MojzsisT. Mark Harrison
New mapping, geochronology, and geochemistry of the supracrustal enclave and associated orthogneisses at Akilia, West Greenland, support a ≥3825 ± 6 Ma age for the sequence and a chemical sedimentary...
Science Paper
Seasonal Variation in the Stable Carbon Isotopic Composition of Algal Lipids in a Shallow Anoxic Fjord: Evaluation of the Effect of Recycling of Respired CO₂ on the δ¹³C of Organic Matter
Yvonne Van BreugelStefan SchoutenMatthias PaetzelJaap S. Sinninghe Damsté
The sedimentary records of the Toarcian oceanic anoxic event display an up to 6 permil negative δ13C excursion in both carbonate and organic matter. One hypothesis to explain this excursion...