Geochronology and geochemistry of basalts from the Karamay ophiolitic mlange in West Junggar (NW China): Implications for Devonian-Carboniferous intra-oceanic accretionary tectonics of the southern Altaids
Gaoxue Yang et al., Ministry of Education, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Xi'an 710054, China. Posted online 10 Dec. 2012; http://dx.doi.org/10.1130/B30650.1.
According to a current tectonic model, the West Junggar (NW China) has been attributed to an intra-oceanic subduction system, which is illustrated by the fact that there are different models for a single subduction zone, arc-arc collision and ridge-subduction. However, in this paper, Gaoxue Yang and colleagues report new U-Pb age data from zircons and whole-rock major and trace element data from the basaltic units in the Karamay ophiolitic mlange. The data reveal the presence of Devonian OIB-type alkaline basalt in the Karamay ophiolitic mlange, which suggest an intra-oceanic setting. Furthermore, their data provides a new discovery on Devonian plume-related magmatism in the Central Asian Orogenic Belt.
Variable ecosystem response to climate change during the Holocene in northern Minnesota, USA
Kendra K. McLauchlan et al., Dept. of Geography, 118 Seaton Hall, Kansas State University, Manhattan, Kansas 66506, USA. Posted online 21 Dec. 2012; http://dx.doi.org/10.1130/B30737.1.
Abrupt climate changes affe
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Geological Society of America