Geochronology of and Nd-Sr-Pb isotopic evidence for mantle source in the ancient subduction zone beneath Sanshui Basin, Guangdong Province, China
Tóm tắt
The available petrochemical data indicate that volcanic rocks in the Sanshui basin of Guangdong Province 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 China continent, which is considered to have resulted from the suturing of various terrains in southern China.
Từ khóa
Tài liệu tham khảo
Zhu Bingquan et al.,Earth Planet. Sci. Lett. (in press).
Li Chunyu et al.,An Introduction to the Tectonic Map of Asia, ed. by the Chinese Academy of Geosciences.
Chen Yuwei et al.,Geochemistry, 1 (1982), 137–158.
Zhou Xinhua et al.,Carnegie Institution of Washington D. C. Year Book, 81 (1982), 505 -508.
Zhu Bingquan et al.,Earth Planet. Sci. Lett., 65 (1983), 263–275.
Xu Qinghua et al.,Scientia Sinica (Series B), 10(1987), 1107–1115.