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Moonrise
over sandstone pipe and Jurassic Entrada Sandstone,
Kodachrome State Park, Utah
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| Recent
Research |
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The
intrusive-extrusive connection in the
Turkey Creek caldera, SE Arizona.
Statistical analysis of speciation among
dinosaurs shows most were in decline
tens of millions of years before the
Cretaceous–Paleogene mass extinction event 66
Mya.
New
apatite ages from the Rio Grande rift
suggest a geodynamic model for extension.
Zircons
paint a messy picture
of the suture in Grand Canyon's Crystal shear zone.
Seismicity in the interior western U.S. occurs
along an intermountain belt that coincides
with a change
from thin to thick lithosphere.
Models suggest active mantle flow may be one of the
reasons.
Are more felsic magmas the result of
fractionation or assimilation? Are granites
what's left after more mantle-like components
crystallize and sink or are they formed by the
addition of crustal country rock as the melt
ascends? Recent papers suggest fractionation
may be the dominant process.
- Kemner, F., Haase,
K. M., Beier, C., Krumm, S. and Brandl, P. A.
(2015), Formation
of andesite melts and Ca-rich plagioclase in the
submarine Monowai Volcanic System, Kermadec Arc.
Geochem.
Geophys. Geosyst. Accepted Author
Manuscript. doi:10.1002/2015GC005884
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