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Reinterpreting origins, examining skeletal preservation, and understanding volcanics
Date:12/19/2013

ts' view of Cambrian animal diversification. To understand the loss of this fossil preservational mode, Jessica R. Creveling and colleagues analyzed a drill core of Cambrian carbonate rocks from central Australia that display exceptional apatite fossil preservation. Authors Jessica Creveling and colleagues asked: What was the source of phosphorus for this fossil preservation? Combining geological observations and geochemical data, the authors found that apatite fossil preservation occurred during times when subsurface ocean water masses were anoxic (without oxygen) and rich in iron. This suggests that, in addition to phosphorus delivery by organic matter settling to the seafloor, adsorption to iron minerals that formed in the anoxic water column provided a significant phosphorus shuttle to Cambrian marine sediments. Future research should further explore whether changes in the amount or style of phosphorus delivery to the seafloor, the post-delivery fate within sediments, and/or skeletal evolution drove the observed decline through time of Cambrian phosphate mineral accumulation and exceptional fossil preservation.


Relationships between tectonics and magmatism in a transtensive/transform setting: An example from Faial Island (Azores, Portugal)
D. Trippanera et al., Dipartimento di Scienze, Universit Roma Tre, Largo S.L. Murialdo, 1, 00146 Rome, Italy, daniele.trippanera@uniroma3.it. Posted online ahead of print on 6 Dec. 2013; http://dx.doi.org/10.1130/B30758.1.

The Azores archipelago, lying where the plate boundary between the Nubian and Eurasian plates meets the Mid -Atlantic Ridge, is a rare site to investigate relationships between magmatism and tectonics. The peculiar geological features of Faial, among the most active island of the archipelago (e.g. the 1998 earthquake and the 1957-58 Capelinhos eruption),
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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