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Seismic zones, river deltas, landslides, fossil reptiles, and more new Geology science
Date:3/6/2012

nt. Several delta plains of the Mekong delta did not initiate simultaneously, but propagated laterally since 3500 years ago. Delta plains formed as a result of successive emergence of bars that bifurcated the river mouth. This study by Tamura and colleagues, based on the Mekong delta, demonstrates for the first time that bar emergence is a key process in the long-term evolution of deltaic lowlands.

A new technique for identifying rock avalanchesourced sediment in moraines and some paleoclimatic implications
Natalya V. Reznichenko et al., Department of Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand. Published online 28 Feb. 2012; doi: 10.1130/G32684.1.

Moraines are widely used as indicators of past climate changes, and their chronologies are crucial for reconstructing global climate-change patterns. However, glaciers do not build moraines only in response to climate disturbances. Where a large rock avalanche covers enough of the ablation zone of a glacier, the reduced ablation can cause the glacier to advance independently of climate and redeposit the rock avalanche material as a moraine before retreating again. Such moraines should clearly not be used in glacial paleoclimatic databases. Hitherto there was no reliable technique to identify rock avalanche material in moraines. Natalya V. Reznichenko of the University of Canterbury and colleagues describe a new method to distinguish rock avalanche sediment from glacially produced material based on the effects of the contrasting stress, strain, and fracture conditions in a rock avalanche and beneath a glacier. As a result of these conditions, rock avalanche sediments contain large quantities of ultra-fine fragments that form agglomerates, but neither the ultrafine particles nor the agglomerates are produced by subglacial rock comminution. Reznichenko and colleagues note that the presence of these agglomerates in a moraine shows that t
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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