The characteristics and evolution of Youjiang terrace, Bose Basin

Abstract：Bose Basin is located in western Guangxi. The Youjiang River flows southeastward through the middle of the Bose Basin. On the basis of field geological survey in combination with previous studies, the authors have reached the conclusion that I-III order terraces are generally developed in western Bose Basin, and Ⅲ- order terraces which suffered damage by active faults are ladder-like. Ⅳ-order terraces are developed at Fulian Village of Bose. The characteristics of Youjiang terraces are summarized in this paper, and the ages of the terraces deposits are determined. The ages of the subjacent deposits of Ⅱ-order terraces are dated at (16.736±1.422)×104 a-(17.712±1.506)×104 a BP, whereas the ages of the subjacent deposits of Ⅲ-order terraces are dated at (21.097±1.793)×104 a-(29.365±2.496)×104 a BP.