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Date:2/22/2013

view by presenting a unique lake sediment data set combining diatom-inferred acidity reconstruction with detailed quantitative assessment of soil base dynamics. They show, at Krakenes Lake in Norway, that historical development of soil mineral depletion inferred from the lake sediment record is consistent with the extent and timing of early Holocene acidification. The lake-water acidification can be fully accounted for by abiotic soil mineral depletion, suggesting a lesser role for alternative acidifying mechanisms like direct climate impacts and successional changes in organic acid production. There are at present few comparable data sets, but those that exist suggest similar rates of soil base depletion. This acidification is not confined to water; abiotic mineral depletion is likely also to impact terrestrial ecosystems, and dynamic vegetation models that exclude irreversible mineral depletion will fail to capture an important element of global ecology.


Uplift of the West Kunlun Range, northern Tibetan Plateau, dominated by brittle thickening of the upper crust
Xiaodian Jiang et al., Dept. of Marine Geology, Ocean University of China, 238 Songling Road, Qingdao, China. Posted online 20 Feb. 2013; http://dx.doi.org/10.1130/G33890.1.

The collision between Indian and Eurasia led to the formation of the Tibetan Plateau that has an average elevation of 5 km and a much thickened crust. However, the mechanisms responsible for both the topographic uplift and the crustal thickening remain controversial. Xiaodian Jiang and colleagues report high-resolution seismic reflection data from the West Kunlun Range Front at the northwestern margin of the Tibetan Plateau that show that crustal structures there are dominated by nappes of upper crustal rocks. Horizontal shortening in the upper crust by brittle folding and faulting correlates positively with crustal thickening, a
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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