October Geology and GSA Today media ... (ter coral depend upon for rapid growth a...)

October Geology and GSA Today media highlights

Date:9/25/2007

ter coral depend upon for rapid growth and calcification.

Damage and permeability around faults: Implications for mineralization
Heather A. Sheldon, CSIRO, Exploration & Mining, PO Box 1130, Bentley, WA 6102, Australia; +1-61 8 64368915, +1-61 8 64368555 (fax); and Steven Micklethwaite, Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. Pages 903-906.

Gold deposits and other valuable minerals are commonly located close to bends or gaps in major faults. Recent work has drawn parallels between the location of aftershocks around modern faults, such as the San Andreas fault, and the location of mineral deposits around ancient faults. Sheldon and Micklethwaite explain these relationships in terms of "damage," or cracking, that occurs after a fault rupture event or earthquake. Damage creates pathways that allow fluid to pass through the rock, transporting and depositing gold and other minerals. The ability to simulate this process using computers may lead to the prediction and discovery of previously unknown mineral deposits.

Segmentation in episodic tremor and slip all along Cascadia
Michael R. Brudzinski, Miami University, Geology Department, Oxford, Ohio 45056, USA; +1-513-280-0660, +1-513-529-1542 (fax); and Richard M. Allen, Seismological Laboratory, Department of Earth & Planetary Science, University of CaliforniaBerkeley, Berkeley, California 94720, USA. Pages 907-910.

The recent discovery of episodic tremor and slip (ETS) in subduction zones is based on slow slip episodes visible in global positioning system (GPS) observations correlated with nonvolcanic tremor signals on seismometers. ETS occurs just inboard from a region capable of great megathrust earthquakes; however, whether there is any communication between these two processes remains unknown. In this study, Brudzinski and Allen use new single-station methods to compile an ETS cat
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

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October Geology and GSA Today media ...(ter coral depend upon for rapid growth a...)