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

andon, Manitoba R7A 6A9, Canada. Posted online ahead of print 16 May 2013; http://dx.doi.org/10.1130/G34275.1.

Copper and gold commonly occur together in two deposit types known as porphyry copper (plus or minus gold and molybdenum) and iron oxide-copper-gold (IOCG) deposits. Porphyry deposits are characterized by abundant iron-sulfide minerals, whereas IOCG deposits are characterized by abundant iron-oxide minerals. Both deposit types are major targets for mineral exploration. The origin of porphyry deposits is relatively well established (they are formed from hydrothermal fluids exsolved from magmas emplaced at shallow levels in the crust, in tectonic settings related to subduction of oceanic plates). The origin of IOCG deposits is more widely debated, but several aspects of their nature and mode of formation are similar to porphyry deposits, including their key metal contents, formation by hydrothermal fluids arguably exsolved from magmas, and broad tectonic association. However, IOCG deposits are more common in ancient (Precambrian, older than or about equal to 550 million years old) rocks, whereas porphyry deposits are most abundant in younger (Phanerozoic, younger than or about equal to 550 million years old) rocks. Study authors Jeremy P. Richards and colleagues propose that this temporal distribution is related to established oxygenation of the deep oceans at the end of the Precambrian, which for the first time introduced abundant seawater-derived sulfur into subduction zones, and led to the predominance of sulfide-rich porphyry deposits in the Phanerozoic.


Orbital-scale climate change and glacioeustasy during the early Late Ordovician (pre-Hirnantian) determined from δ18O values in marine apatite
M. Elrick et al., Earth & Planetary Sciences Dept., University of New Mexico, Albuquerque, New Mexico 87131, USA. Posted online ahead of print 16 May 2013;
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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