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Late Mesozoic volcanism in the Great Xing'an Range(NE China):timing and implications forthe dynamic setting of NE Asia

【摘要】:正Mesozoic volcanism is widespread throughout northeastern China but precise geochronological constraints have previously been lacking.Twenty samples,including basalts and basaltic andesites,from the Great Xing'an Range have been collected and used for Ar/~(39)Ar age determinations.The ages mainly cluster around four periods:~163-~160 Ma,~147-~140 Ma,~125-~120Ma and~116-~113Ma.It shows that the volcanic succession pulsed from~160 Ma in the late Jurassic until the early Cretaceous.This result,combined with previous compilations of data from adjacent areas,suggests a volcanic migration from west to east through northeastern Asia.These volcanic rocks were formed in an extensional setting,as indicated by the occurrence of A-type granites,mafic dyke swarms,metamorphosed core complexes and basins.The timing (~160-140 Ma) of mantle underplating and transition from crustal contraction to extension in this region suggests that all these geological activities immediately followed the closure of Mongol-Okhotsk ocean at~160 Ma.Based on such observations,a shears-shaped lithospheric delamination mechanism is proposed for the geodynamic scenario of northeastern Asia during late Mesozoic:The collision between north China and Siberia around~160 Ma obstructed the westwards movement of the lithosphere induced by the subduction of the Pacific plate;this tremendous stress caused the thickened lithospheric delaminating from west edge of the northeast China-Mongolia block at~160 Ma and extended gradually eastwards;this mechanism finally led to mantle upwelling and underplating,resulting in volcanism migration from west to east in northeastern Asia during late Mesozoic times.

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