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Contacts, collisions, sutures, belts, and margins -- new GSA Bulletin content
Date:4/9/2013

led study of the Lower Devonian Tsakhir Formation in the Shine Jinst region of southern Mongolia. They interpret a stratigraphic transition from quiet water carbonate deposits to coarse siliciclastic marine deposits as a record of a tectonic event, which they have titled "The Tsakhir Event." Their sedimentological analysis, in combination with detrital zircon geochronology data, provides important insights into the depositional history and the tectonic evolution of the Gobi-Altai zone, and more generally, the Central Asian Orogenic Belt.


Characterizing the continental basement of the Central Andes: Constraints from Bolivian crustal xenoliths
Claire L. McLeod et al., NCIET, Dept. of Earth Sciences, Durham University, South Road, Durham, DH1 3LE, UK. Posted online 7 March 2013; http://dx.doi.org/10.1130/B30721.1.

Critical to understanding the development of active continental margins is knowledge of the crustal basement on which magmatic arcs are built. This study by Claire L. McLeod and colleagues reports results from a whole-rock geochemical and zircon U-Pb geochronological study of a suite of crustal xenoliths from the Bolivian Altiplano, Central Andes, that provide new insight into the evolution and composition of the continental basement beneath the region. The xenoliths comprise both igneous and metamorphic lithologies, including diorites, microgranites, gneisses, garnet-mica schists, granulites, quartzites, and dacites. The xenolith suite exhibits significant Sr-isotopic heterogeneity (87Sr/86Sr from 0.7105 to 0.7368) whilst Pb isotopic signatures reflect crustal domains previously constrained from scattered surface exposures of basement rocks. Ion microprobe U-Pb dating of zircon reveal Early Phanerozoic, Late Mesoproterozoic and Paleoproterozoic age peaks. The presence of these age peaks in the detrital zircon population record demonstrates the important role
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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