Reconstruction of Early Paleozoic arc-trench system: a case study in the eastern Gondwana margin

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The target of our research is to reconstruct the Early Paleozoic arc-trench system along the eastern margin of Gondwanaland. However, the chronological results on Attunga eclogite and host gabbro in the serpentinite melange yield a range from 660Ma to 460Ma zircon U-Pb SHRIMP gaes with 660Ma, thus the time span for rearch has been expanded to Neoproterozoic. Tectonics of Neoproterozoic along the later Gondwana eastern margin include those of breakup process of the Rodinia supercontinient . We obtain the following results1) We propose a model of the Phillipne type for Early Paleozoic Gondwana margin.2) In Latest Neoproterozoic, a subduction zone was produced. Simultneously, a rifting and opening of an ocean in the Kanmantoo Fold Belt occurred in the Eastern Gondwana part.3) Serpentinite melange includes various kinds or igneous and metamorphic rocks. Their ages range from Neoproterozoic to Early Mesozoic.4) During the Rodinia breakup, petrochemical evidence of mantle plume activity is obatained.After the breakup, arc systems were formed firstly in SW Siberia and then Australia.