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Ding, Shijiang; Hu, Jianmin; Song, Biao; Chen, Mulun; Xie, Shengzhou; Fan, Yuan
Science China. Earth sciences, 12/2005, Letnik: 48, Številka: 12Journal Article
The petrological and geochemical features of the bed parallel granitic intrusion in the Pre-Cambrian Baoban group in Hainan Island attest to the anatexis origin of the granites. U-Pb dating analyses of zircons from the anatectic granite and the biotite two-feldspar gneiss in the Baoban group, using SHRIMP II in the Beijing Ion-probe Center, acquire 206Pb/238U ages of 368+/-3.5 Ma (of granite, 95% confidence level, MSDW=1.23) and 362.9+/-6.1 Ma (of gneiss, 95% confidence level, MSDW = 2.04) respectively. The two late Devonian ages indicate consistently a tectonic- thermal event experienced in Hainan Island, and are the first discovered record of the Devonian geological process in the district. This event possibly resulted from the deep ther-mal-dynamic process when the Gondwana continent began to break up in the Devonian period.
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in: SICRIS
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