Nd-Sr-Pb isotope geochemistry of the volcanic-intrusive complex at Xiangshan, Jiangxi province.

This paper presents study on Nd, Sr and Pb isotope geochemistry of the volc anic-intrusive complex at Xiangshan. The volcanic rocks of the two main eru ption cycles (140 Ma) and the late subvolcanic rocks (135 Ma) have lower ep silon (Nd) (t) values (-9.40 similar to -7.46), higher initial Sr-87/Sr-86 ratios (0.70801 similar to0.71201) and older Nd model ages (1.54 similar to 1.70 Ga). These rocks are also relatively riched in radiogenic Pb (Pb-206/P b-204 = 17.686 similar to 18.323, Pb-207/Pb-204 = 15.523 similar to 15.730, Pb-208/Pb-204 = 38.143 similar to 38.936). There exist evident similaritie s and also minor differences in Nd and Pb isotope compositions between the complex and the basement meta-sedimentary rocks. The volcanic-intrusive com plex may have been derived mainly from partial melting of crustal rocks res embling the basement meta-sedimentary rocks. However, minor mantle-derived materials may have also been involved in formation of these rocks.