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Catastrophic debris avalanches -- a second volcanic hazard
Date:7/18/2014

dx.doi.org/10.1130/B31040.1.

Earth's mantle, at high depths, is strikingly exposed in rare places on Earth's surface. This special situation requires the combination of different mechanisms in nature that allow such emplacement. The high temperature contact between the mantle rocks and those accompanists from the deep crust during their ascent, describe a particular picture in Earth's surface that needs an interdisciplinary study in detail of rocks and structures. Thereby, this paper focuses in the information given by the crustal rocks (partly melted at high temperatures), which are in turn coupled to the mantle rocks information, to constrain the emplacement process in one of the largest exposures of mantle rocks on Earth the Betico-Rifean belt (southern Spain and northern Morocco).


Multi-stage emplacement of the McDoogle pluton, an early phase of the John Muir intrusive suite, Sierra Nevada, CA, by magmatic crack-seal
M.A. Stearns and J.M. Bartley, Dept. of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA. Published online 30 June 2014; http://dx.doi.org/10.1130/B31062.1.

New mapping of the McDoogle pluton in the Sierra Nevada has resolved important details of its detailed intrusion history. The 95-million-year-old pluton is tabular and concordant to the steeply dipping surrounding rocks. It was previously divided into three phases (a central phase and two adjacent border phases) based on anatomy and rock type. The earliest central phase is made up of steep dikes separated by abundant inclusions of the wall rock. These screens are largely absent from border phases located on either side of the central phase. The inferred relative ages of intrusive phases and the wall-rock screen distribution mark a change from addition of new material at the margins (central phase) to addition at the center of each growing phase (border phase
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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