Abstract
Seven ore districts comprising more than 200 polymetallic deposits along the Lower Yangtze valley (LYV) from west to east are Edong, Jiurui, Anqing-Guichi, Tongling, Luzong, Ningwu and Ningzhen. These districts include Fe-Cu (Au), Cu-Au (Mo), Cu- Fe-Mo (Au), Fe-Cu-Pb-Zn, Cu-Au, Fe-Cu (Mo) and Fe-Pb-Zn deposits. According to available highly-precise isotopic ages for Cu-Fe-Au polymetallic deposits and related rocks in the LYV, large-scale mineralizing processes took place during the Late Mesozoic, with two pulses occurring at ∼140 Ma and ∼125 Ma. These ages are in agreement with the emplacement ages (135–140 and ∼125 Ma) of voluminous igneous rocks in this region. Two stages of Late Mesozoic polymetallic mineralization occurred in this lithospheric extensional regime, and are probably related to lower crustal delamination and lithospheric thinning in East China.
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