Abstract
Abstract 40Ar‐39Ar dating of albite from the Meishan and Taocun iron deposits yields plateau ages of 122.90±0.16 Ma and 124.89±0.30 Ma, and isochron ages of 122.60±0.16 Ma and 124.90±0.29 Ma, respectively. Phlogopite from the Zhongshan‐Gushan ore field has a plateau age of 126.7±0.17 Ma and an isochron age of 127.21±1.63 Ma. Analysis of regional geodynamic evolution of the middle‐lower Yangtze River region suggests that the porphyry iron deposits were formed as a result of large‐scale lithosphere delamination and strong sinistral strike‐slip movement of the Tancheng‐Lujiang fault zone. The copper, molybdenum and gold deposit system in the middle‐lower Yangtze River region was formed during the stress transition period of the eastern China continent.
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