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Mistaken point, Sanctuary of Zeus, catastrophic outburst floods, shocked sand grains
Date:2/20/2014

ve repeatedly occurred at the end of the last ice age, causing significant environmental and even global climatic changes. Most of these events are tied to the large continental ice sheets that covered much of North America and Northern Europe during the Pleistocene epoch. Smaller, but similar catastrophes may also have occurred in many of the Earth's glaciated mountain ranges, but traces are difficult to find. Dirk Scherler and colleagues found evidence in the Karakoram Range, northern India, that a more than 180-km-long valley glacier blocked one of the largest tributaries of the Indus River. Field mapping and cosmogenic-nuclide dating allowed the authors to reconstruct a chronology that documents repeated damming and outburst flooding, which likely occurred throughout much of the Quaternary period, i.e., the last ~2 million years. Intriguing similarities between their study site in the eastern Karakoram and areas farther downstream the Shyok and Indus rivers suggest that in this part of the world, ice dams and catastrophic outburst floods were common phenomena during the Quaternary and may have contributed to the deep incision of the western margin of the Tibetan Plateau.


Preservation of detrital shocked minerals derived from the 1.85 Ga Sudbury impact structure in modern alluvium and Holocene glacial deposits
Olivia A. Thomson et al., University of Puerto Rico Geology Department of Geology University of Puerto Rico Call Box 9000 Mayaguez, Puerto Rico 00681-9000. Posted online ahead of print on 13 Feb. 2014; http://dx.doi.org/10.1130/B30958.1.

Meteorite impacts can cause dramatic changes in global climate, biology, surface geomorphology, and also concentrate economic metals. Recreating the terrestrial impact history is thus important to many fields of Earth science. However, many impact structures have eroded away with time, and are no longer preserved in the g
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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