Geochemistry of a Cretaceous Volcanic Belt in Eastern Mongolia
An Early Cretaceous eastern Mongolian volcanic belt is biggest segment over than 2000-km long and extended from eastern Mongolia to far-eastern Siberia across the preexisting Neoproterozoic-Early Mesozoic Central Asian accretionary orogen.Three series volcanic rock were generated during the development of this belt: bimodal volcanic rocks (~120 Ma for alkali basalt), shoshonite series (~113.3 Ma for absarokite) and a basanite and tephrite series with an age of~104.7 Ma.They have high content ofBa, Rb, La and relatively minor deficite of Nb and Ta.The shoshonite series rocks are often characterized by released source of subducted material.However, they have relatively more depletion of Nb and Ta than the alkali basalt of bimodal series.The deep negative of Nb and Ta spikes are defined from quartz latites, dacites, and rhyolites of this series.The geochemistry data suggest that the Eastern Mongolian volcanic belt was developed in the continent that extended by global tectonic occurred in East Asia.
Eastem Mongolian volcanic belt alkali basalt bimodal shoshonite series rocks basanite tephrite
Batulzii Dash NENG Jiang
Department of Geology,Mongolian University of Science and Technology,Ulaanbaatar 210646,Mongolia Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,China
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
134-138
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）