摘要
The available petrochemical data indicate that volcanic rocks in the Sanshui basin of Guangdong Prov-ince are characteristic of the island-arc tholeiite-calc-alkaline series.Their K-Ar ages range from 43 to 64 Ma,corresponding to Early Tertiary.The Nd-Sr-Pb isotopic correlations give two binary mixing trends,indicating a mixed source of Leiqiong depleted mantle,seawater and altered sediments pertaining to subduction.Our studies have confirmed the existence of an ancient subduction zone beneath the South Chi-na continent,which is considered to have resulted from the suturing of various terrains in southern China.
The available petrochemital data indicate tnat volcanic rocks in the Sanshui basin of Cuangdong Prov- ince are charactenstic of the island-arc thoieiite-calc-alkaline series. Their K-Ar ages range from 43 to 64 Ma, corresponding to Early Tertiary. The Nd-Sr-Pb isotopic comelations give two binary mixing trends, indicating a mixed source of Leiqiong depleted mantie, seawater and aitered sediments pertaining to subduction. Dur studies have confirmed the existence of an ancient subduction zone beneath the South Chi- na continent, which is considered to have resulted from the suturing of various terrains in southem China.
