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December GEOLOGY and GSA TODAY media highlights
Date:11/29/2007

d lake cycles that occurred on time scales of approximately 20,000 years. These wet and dry periods were likely forced by astronomical precession cycles that altered the intensity of the monsoon rains. A freshwater wetland fed by groundwater (on the basin margin) existed during even the driest times and may have been important for the survival of hominins in this harsh environment.

The flux of gold and related metals through a volcanic arc, Taupo Volcanic Zone, New Zealand
Stuart F. Simmons, University of Auckland, School of Geography, Geology and Environmental Science, Auckland 1142, New Zealand; and Kevin L. Brown, GEOKEM, Swanson, Waitakere 0653, New Zealand. Pages 1099-1102.

Using a breakthrough in sampling technology in order to understand how precious metal ore deposits form, Simmons and Brown determined how much. and how fast. gold and silver are transported by deeply circulating hot waters in a volcanically active belt, the Taupo Volcanic Zone, New Zealand. The chemistry of the hot fluids and the contributions from deep-seated magmas are the main controls of how much gold and silver are in solution, whereas fluid-flow rates dictate the gold and silver fluxes and how fast ore deposits form. Overall, enough gold and silver are transported through the Taupo Volcanic Zone in a geologically short period of time (approximately 50,000 years) to account for some of the largest precious metal deposits in the world.

Ca. 825 Ma komatiitic basalts in South China: First evidence for >1500 C mantle melts by a Rodinian mantle plume
Xian-Hua Li et al., Institute of Geology and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Beijing 100029, China. Pages 1103-1106.

The breakup of the Neoproterozoic supercontinent Rodinia had important implications for extreme climate change and the first appearance of multicellular life on Earth. Although mantle plume activit
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

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