Osmium isotope determination on mantle-derived peridotite xenoliths from Panshishan with N-TIMS |
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| Authors: | Weidong Sun Zicheng Peng Xiachen Zhi Daogong Chen Zhaorong Wang Xinhua Zhou |
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| Institution: | (1) Department of Earth and Space Sciences; Advanced Research Center on Earth Science and Astronomy of the Third World Academy of Science, University of Science and Technology of China, 230026 Hefei, China;(2) Laboratory of Lithosphere Tectonic Evolution, Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | The187Os/188Os ratios of spinel lherzolite xenoliths from Panshishan determined with N-TIMS are lower than that of the primitive mantle,
which shows depleted mantle characteristics. Their positive correlation with Al2O3/MgO suggests that the geochemical behavior of trace elements Re and Os is similar to that of Al2O3 and MgO respectively during the magmatic evolution and Re-Os isotopic system is largely immune to mantle metasomatism. A
model age of 2.8–3.4 Ga obtained by187Os/188Os-Al2O3/ MgO correlation might represent the homogeneous age of the mantle lithosphere beneath the area. |
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| Keywords: | negative thermal ionization mass spectrometry osmium isotope mantle-derived peridotite xenolith |
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