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GSA's top geoscience journal posts 9 new articles
Date:5/2/2013

s extended outward from near-shore to the mid-shelf, and were overlain by oxic surface waters and underlain by anoxic and Fe-rich (ferruginous) water maintaining the redox stratification of the ocean, which developed with the evolution of oxygenic photosynthesis. Widespread sulfidic conditions throughout the Mesoproterozoic have been implicated in the protracted oxygenation of the atmosphere and slow rates of eukaryotic evolution. However, the continuation of ferruginous deep water conditions through the Mesoproterozoic, with sulfidic conditions limited to areas of high organic carbon production, highlights that the controls on productivity, and oxygenic productivity in particular, remain poorly understood. Linda Godfrey and colleagues report new nitrogen and carbon isotope data for sediments from six drill cores that provide a 350-km-long oblique transect to the paleo-coastline of the Animikie Basin on the margin of Superior Province, North America.


North Atlantic versus Southern Ocean contributions to a deglacial surge in deep ocean ventilation
L.C. Skinner et al., Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK. Posted online ahead of print on 29 April 2013; http://dx.doi.org/10.1130/G34133.1.

Evidence has emerged confirming a key role for Antarctic regional climate changes in regulating atmospheric CO2 on millennial time-scales. Using geochemical evidence from a sub-Antarctic marine sediment core, geoscientists reveal that the two pulses in atmospheric CO2 that occurred during the last deglaciation (~20,000 to 10,000 years ago) coincided with a surge in the rate at which carbon was exchanged between the atmosphere and the sub-surface Southern Ocean. While the glacial-interglacial climate cycles of the late Pleistocene (the last ~two million years) were paced by gra
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8

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