Geochronology of Ailaoshan-Jinshajiang alkalirich intrusive rocks and their Sr and Nd isotopic characteristics |
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| Authors: | Yuquan Zhang Yingwen Xie |
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| Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China |
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| Abstract: | Twenty-nine isotopic ages, ranging from 41 to 27 Ma, are presented for the alkali-rich intrusive rocks and their coexisting
alkaline volcanic rocks, lamprophyres and acidic porphyries, indicating that they are Tertiary in age. The alkali-rich intrusive
rocks have143Nd/144Nd ratios from 0. 512 415 to 0. 512 544, and87Sr/86Sr ratios from 0.705 4 to 0.706 8, suggesting that their material originates from an enriched mantle source.
Project supported by the National Natural Science Foundation of China and the Special Grant of the President of Chinese Academy
of Sciences. |
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| Keywords: | alkali-rich intrusive rocks chronology Nd and Sr isotopes |
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