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《中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)》 2012年
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Kinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar,NW China

【摘要】:正The Karamay area,situated in the eastern part of Western Junggar,Southern Altaids,contains an ophiolitic melange with ultramafic rocks,gabbro,basalt,chert and limestone,which show typical block-in-matrix structures,and coherent turbidites and tuffs.These lithological associations are interpreted as incoherent and coherent series formed in an acaetionary complex.On the basis of detailed field mapping and analyses of the asymmetry of imbricate thrusts,duplexes,tilted structures,shear band cleavages,and the NW-verging inclined to overturned folds,we conclude that the overall movement in the accretionary complex was top-to-the-NW.The youngest tuff involved in the deformation contains detrital zircons that have a U-Pb age(LA-MCICP-MS) of 308±7 Ma.~(39)Ar-~(40)Ar resistance furnace step-heating of amphibole separates from a diorite dike,which cuts the folded and imbricated rocks in the accretionary prism,yielded a plateau age of 307±2 Ma.Consequently,the age of the deformation in the prism is tightly constrained at 307-308 Ma,implying that the deformation occurred in an extremely short time-span during SE-ward subduction.Combined contemporaneous occurrence of Baogutu adakite,high-Mg,Sr-enriched and Y-poor dioritic dikes,Miaoergou charnockite,and Maliya mafic rocks,we further suggest the acaetionary complex was cut by near-trench volcanic rocks and plutons possibly due to interaction with a spreading ridge.

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