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January-February GSA Bulletin media highlights
Date:1/12/2009

cult to say whether the magmatic activity is an on-going process. Drape structures in the youngest sedimentary unit argue against this. The Oligocene-Miocene represents a period of major change. Bottom current activity then took over as the most important depositional process. Strong cooling events in the late Miocene resulted in modification in the oceanographic regime east of New Zealand. This led to the formation of channels, sediment drifts, and sediment waves. At least since the Miocene, bottom current activity has been the dominating depositional process.


Prominence of ichnologically influenced macroporosity in the karst Biscayne aquifer: Stratiform "super-K" zones

Kevin J. Cunningham et al., U.S. Geological Survey, 3110 SW 9th Avenue, Fort Lauderdale, Florida 33315, USA. Pages 164-180.

Macroporosity related to geometrically complex arrangements of tunnels and shafts created by thalassinidean shrimp, which burrow in carbonate sediment beneath the sea floor, strongly affects where groundwater flows within Pleistocene limestone in substantial parts of the Biscayne aquifer, southeastern Florida. The macroporous zones represent an alternative pathway for focused groundwater flow that differs considerably from standard karst flow-system paradigms, which describe groundwater movement through fractures and cavernous dissolution features. X-ray computed tomography scans of samples of this type of macroporosity and surrounding limestone matrix were used by Cunningham et al. in lattice Boltzmann computer simulations that calculated its permeability. Results show that burrow-related permeability is as high as 3.5 times 10 to the sixth Darcies, about 2 to 5 orders of magnitude higher than the reported permeabilities for Jurassic "super-K" zones of the giant Ghawar oil field, Saudi Arabia. The highly permeable macroporous zones of the Biscayne aquifer provide well-documented examples of ichnologically-influenced macroporosity fo
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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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