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Geosphere covers Grand Canyon, deep drill coring, Death Valley, and more
Date:12/28/2012

ic systems. The importance of faults as conduits for northeastern Mexico volcanism is recognized, but connections between faulting and the hydrogeologic system have not been extensively investigated. This research tests the hypothesis that Cuatrocinegas Basin springs are divided into two general classes based upon discharge properties: (1) regional carbonate aquifer discharge (mesogenic) mixed with contributions from deeply sourced (endogenic) fluids containing 3He and CO2 from the mantle that ascend along basement-involved faults; and (2) carbonate aquifer discharge mixed with locally recharged (epigenic) mountain precipitation. This study demonstrates the presence of mantle derived 3He and deeply sourced CO2 that ascend along basement-penetrating faults and mix with Cupido aquifer groundwater before discharging in Cuatrocinegas Basin springs.


Orbitally paced shifts in the particle size of Antarctic continental shelf sediments in response to ice dynamics during the Miocene climatic optimum
S. Passchier et al., Dept. of Earth and Environmental Studies, Montclair State University, 252 Mallory Hall, 1 Normal Avenue, Montclair, New Jersey 07043, USA. Posted online 13 Dec. 2012; http://dx.doi.org/10.1130/GES00840.1.

Drillholes within sediment archives on the Antarctic continental margin shed light on changes in ice cover during past warm periods. By analyzing the changes in the seafloor sediment composition in an ANDRILL core from the Ross Sea continental shelf, S. Passchier and colleagues investigate the interactions between the ice sheet and the ocean. They discuss how, over time, ice growth and decay control the available wave energy recorded in the grain size of the seafloor sediment and conclude that although melt at the top of the ice sheet may have been limited over the past 18 million years, warm ocean currents may have melted a large proportion of the ice that
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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