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Isotopic feature and uranium dating of the volcanic rocks in the Okinawa Trough

中国科学：地球科学英文版 2006年第4期49卷 375-383页

作者： huang peng1,2,{1., hu ningjing2,3, fu yongtao1& ma zhibang4 1. institute of oceanology, chinese academy of sciences, qingdao 266071, china 2. Graduate School of the chinese academy of sciences, Beijing 1.0039, china 3. institute of Soil Science, chinese academy of sciences, Nanjing 21.008, china 4. institute of Geology and Geophysics, chinese academy of sciences, Beijing 1.0029, china institute of {1. Chinese Academy of Sciences Qingdao China Graduate School of the chinese academy of sciences Beijing China institute of Soil Science Chinese Academy of Sciences Nanjing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Volcanic rocks from the northern and middle Okinawa Trough were dated by ura- nium-series dating method. Differential fractions using magnetic procedure were designed to separate samples. New report on the ages and isotopic data of rocks in the northern trough (especially black pumice) was discussed. Based on the uranium dates and Sr-Nd isotopic ratio, magmatic evolution process of the Okinawa Trough was noted. Firstly, there have been wide silicic volcanic activities in the Okinawa Trough from late Pleistocene to present, and the volcanic rocks can be divided into three subgroups. Secondly, magma generally came from PREma source area under the Okinawa Trough. magmatic evolution in the northern trough was similar to the middle, but different to the south. Finally, volcanic activities indicated that opening of the southern Okinawa Trough did not happen due to the collision between Luson Arc and Eurasian Plate until the early Pleistocene.

关键词： Okinawa Trough, black pumice, uranium-series dating, Sr-Nd isotopic ratio, magmatic evolution.

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