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Snails tell of the rise and fall of the Tibetan Plateau
Date:8/29/2014

ed. The collapsing material also undergoes a volumetric expansion. On volcanoes, such "bulking" of the rocks overlying an emptying magma chamber may at least partially explain why the volume of the erupted lava is commonly larger compared to that of the surface depression. This insight is of great use to seismic or volcano observatories who will face such collapse events in the future.


Impacts of catastrophic volcanic collapse on the erosion and morphology of a distal fluvial landscape: Hautapu River, Mount Ruapehu, New Zealand
M. Tost et al., Volcanic Risk Solutions, Massey University, Palmerston North 4442, New Zealand. Published online 26 Aug. 2014; http://dx.doi.org/10.1130/B31010.1.

Debris avalanches caused by the collapse of volcanic flanks may permanently change the surrounding landscape and its drainage systems. Deposits of a two- to three-cubic-kilometer debris avalanche exposed along the Hautapu River about 50 km southeast of Mount Ruapehu, New Zealand, reflect the largest known collapse event of the stratovolcano, followed by a regrowth phase that produced pyroclastic eruptions and pumice-rich lahars. The collapse most likely occurred due to magmatic unrest during the shift from a glacial to an interglacial climate. The debris avalanche inundated an area of more than 260 square kilometers, and was channelized within the proto-Hautapu catchment. The subsequent pumiceous mass-wasting events continued to be confined to the proto-Hautapu River for another approx. ten thousand years. At present the volcaniclastic deposits form a distinctive plateau on the highest topographic elevation within the river valley, while the Hautapu River incises into the underlying softer late Pliocene sediments.


Sevier belt exhumation in central Utah constrained from complex zircon (U-Th)/He data sets: Radiation damage and He inheritance effects on p
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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