Western Yunnan is the well-known polymetallic province in China. It is characterized by copper-gold mineralization related to Cenozoic alkali-rich porphyry. Thi
<正>A New Study on the Stratotype and Biostratigraphy of the Yixian Stage in the Yixian-Beipiao Region, Liaoning --Establishment and Study of the Yixian Stratot