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

nstrates a new method for reconstructing the very long-term pulse of magma generation processes above subduction zones.


A detection of Milankovitch frequencies in global volcanic activity

Steffen Kutterolf et al., Collaborative Research Center (SFB) 574, GEOMAR, Wischhofstrasse 1-3, 24148 Kiel, Germany. Posted online 30 Nov. 2012; http://dx.doi.org/10.1130/G33419.1.

A rigorous detection of Milankovitch periodicities in volcanic output across the Pleistocene-Holocene ice age has remained elusive. Steffen Kutterolf and colleagues report on a new spectral analysis of a large number of well-preserved ash plume deposits recorded in marine sediments along the Pacific Ring of Fire. Our analysis yields a statistically significant detection of spectral peaks at the obliquity and 100,000-year periods. We propose that the variability in volcanic activity results from crustal stress changes associated with ice age mass redistribution. In particular, increased volcanism lags behind the highest rate of increasing sea level by 4.0 plus or minus 3.6 thousand years and correlates well with numerical predictions of stress changes at volcanically active sites. These results strongly support the presence of a feedback amongst ice age climate, volcanism and continental stress field.


Sequence stratigraphy and the resolution of the fossil record

Daniele Scarponi et al., Dipartimento di Scienze Biologiche Geologiche e Ambientali, University of Bologna, via Zamboni 67, 40126 Bologna, Italy. Posted online 30 Nov. 2012; http://dx.doi.org/10.1130/G33849.1.

Sequence stratigraphy, a key geoscientific achievement of the last decades, offers geologists a process-based framework for understanding how sediments assemble into sedimentary successions as the sea level and other geological proce
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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