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Reinterpreting origins, examining skeletal preservation, and understanding volcanics
Date:12/19/2013

e) growth in magmas too primitive for such minerals to be stable, unaccompanied by isotopic evidence for assimilation of foreign rocks, is the primary signature of the in situ differentiation and mixing process. Long-term magma flux appears to control differentiation style, with high-flux Mount Adams having chemical variations consistent with gradual and progressive growth and separation of crystals from melt, to low-flux Mount St. Helens, with chemical variations indicative of strongly in situ differentiation and mixing.


Paleo- to Mesoarchean polymetamorphism in the Barberton Granite-Greenstone Belt, South Africa: Constraints from U-Pb monazite and Lu-Hf garnet geochronology on the tectonic processes that shaped the belt
Kathryn A. Cutts et al., Centre for Crustal Petrology, Dept. of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa, cuttsk@sun.ac.za. Posted online ahead of print on 13 Dec. 2013; http://dx.doi.org/10.1130/B30807.1.

The Barberton Granite Greenstone Belt (BGGB) of South Africa is a well preserved Meso-Paleoarchean metamorphic supracrustal belt. Two hypotheses persist to explain the origin of amphibolite-facies metamorphism in the southern BGGB. The first interprets these rocks to be the consequence of accretionary tectonics, while the second proposes a vertical tectonic process driven by sinking of greenstone layers and doming of the underlying granitoid crust. Metamorphic pressure-temperature (P-T) analysis with garnet Lu-Hf and monazite U-Pb geochronology is used to directly date the amphibolite-facies metamorphism within the southern BGGB. A garnet age of 3233 plus or minus 17 million years (Ma) and a monazite age of 3191 plus or minus 9 Ma were obtained for two samples that reached peak P-T conditions of 8.5 kbar and 640 degrees C with a clockwise P-T evolution. The durat
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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