Triassic alkaline intrusives in the Yanliao-Yinshan area: their chronology, Sr, Nd and Pb isotopic characteristics and their implication |
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| Authors: | Guohan Yan Baolei Mu Baoliang Xu Guoqi He Linkun Tan Hui Zhao Zhongfu He Renhu Zhang Guangsheng Qiao |
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| Affiliation: | (1) Depertment of Geology, Peking University, 100871 Beijing, China;(2) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | Dated isotopic ages for 15 alkaline intrusives in the Yanliao-Yinshan area, ranging from 268 to 190 Ma, ten of which are from 250 to 208 Ma, indicate that most of them were formed in the Triassic Epoch. All the ENd(t) ratios from - 17.19 to -3.21 averaging -7.09, the ESr(t) ratios fmm 11.7 to71.5 averaging 36.63, and the Isr(t) ratios from 0.705 0 to 0.709 3 averaging 0.706 8, show their characteristics of enrichment. On the ENd (t) virus ESr(t) correlation diagram, the samples from these intmsives were plotted within the enriched mantle trend lines and just outside, demonstrating their close connection to materials from the enriched mantle reservoir, taking into account the same Pb isotopic composition as that of the mantle. |
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| Keywords: | alkaline intrusives chronology Sr Nd Pb isotope Yanliao-Yinshan area |
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