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GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury
Date:12/21/2012

al images of seafloor landforms and sub-seafloor sediments, combined with dated sediment cores, show that the Greenland Ice Sheet extended to the shelf edge as fast-flowing ice streams, including the ancestral Jakobshavn Isbr, during the last glaciation about 20,000 years ago. The ice sheet had commenced retreat from the shelf edge by 14,800 years ago but in "Disko Trough," offshore of Disko Bay, sediment core evidence shows that it underwent a subsequent re-advance onto the outer shelf during the Younger Dryas cold period (12,800-11,700 years ago). This is the first evidence of a major Younger Dryas advance of the Greenland Ice Sheet on the West Greenland shelf, although the short lived duration suggests that it may have been out of phase with Younger Dryas temperatures.


Detrital zircon as a proxy for tracking the magmatic arc system: The California arc example

A.P. Barth et al., Department of Earth Sciences, Indiana UniversityPurdue University Indianapolis, 723 West Michigan Street, Indianapolis, Indiana 46202, USA. Posted online 30 Nov. 2012; http://dx.doi.org/10.1130/G33619.1.

The life and death of volcanos record the tempo and pulses of magma flow at the Earth's surface, but much of the plumbing and the early history of these volcanoes are hidden from view. This study by Andrew Barth and colleagues suggests that combining signals recorded in intrusive igneous rocks and in volcanic sediment can illuminate the waxing and waning of these magma systems over time. Geochemical signals of magma generation and intrusion are recorded in the plumbing of deeply-eroded volcanoes, and these same signals can be preserved in volcanic material washed into adjacent sedimentary basins. The combined geochemical records reveal the timing and nature of pulses and lulls in magmatism where subduction has occurred over very long periods of time. This novel set of observations demo
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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