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Zircon U-Pb ages and Hf-O isotope compositions of the Zhaheba ophiolite in the northern margin of the Junggar terrane and their tectonic implications

PAN Cheng-ze;QIU Lin;YE Xian-tao;DONGYong-guan;National 305 Project Office;Nanjing Institute of Geology and Mineral Resources;  
The Zhaheba ophiolite,located in the northern margin of Junggar terrane,is part of the Zhaheba-Aerman ophiolitic melange belt.Through U-Pb zircon age and Hf-O composition analysis for two samples from the ophiolitic melange belt,this study obtained a crystallization age of 485±4Ma for cumulate gabbros and an eruptive age of 401±2.5Ma for tuffs.The gabbros are characterized by extreme depletion of Hf isotopic composition withεHf(t)of 13~20and δ~(18) O peak value of+5.37‰,indicating a mantlesourced feature.Hf isotope depletion degree of zircons from the tuffs is lower than that from cumulate gabbros,withεHf(t)of 1.4~9.2.All this features suggest that the Zhaheba ophiolite is of typical characteristic of the SSZ type ophiolite,which results from subduction accretion to the front of intra-oceanic arc.
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