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New in GEOLOGY: Gems, Darwin, Mars, Hemp, Snowball Earth, a Siberian Impact Crater, and More
Date:5/20/2013

fresh ways to look for new deposits of these gemstones.


Profiles of ocean island coral reefs controlled by sea-level history and carbonate accumulation rates
Michael Toomey et al., Geology and Geophysics Dept., Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS#22, Woods Hole, Massachusetts 02543, USA; and Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. Posted online ahead of print 9 May 2013; http://dx.doi.org/10.1130/G34109.1.

Coral reefs around islands develop a wide variety of forms, including narrow platforms fringing the coast, barrier reefs encircling deep lagoons, and flights of terraces that have been raised above or drowned deep below the sea surface. Charles Darwin, who was also a geologist, suggested that reefs take on a fixed sequence of forms as a volcanic island gradually sinks below sea level. Reefs on some island chains, such as the Society Islands, appear to follow this sequence, but Darwin's idea cannot explain much of the diversity of reef forms found around the world, such as the reefs of the Hawaiian Islands. In addition to island sinking, reefs are shaped by the interaction of coral growth, wave erosion, and sea level changes. In this study, Michael Toomey and colleagues use a computer simulation of reef development to understand these interactions, and compare their results with a global compilation of rates of coral growth and island sinking or uplift. They find that large sea-level cycles driven by ice ages have left a clear fingerprint on coral reefs around the world, and that Darwin's proposed sequence of reef forms only develops in a small subset of environments.


Sedimentary cannabinol tracks the history of hemp retting
Marlne Lavrieux et al., Institut des Sciences de la Terre d'Orlans, Universit d'Orlans, ISTO, UM
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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