| A Study of REE and Pb,Sr and Nd Isotopes in Garnet—Lherzolite Xenoliths from Mingxi,Fujian Province |
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| 摘 要： |
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| 关 键 词： | 石榴石 铅同位素 锶同位素 稀土元素 钕同位素 福建 捕虏体 |
A study of REE and Pb,Sr and Nd isotopes in garnet-lherzolite xenoliths from Mingxi,Fujian Province |
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| Authors: | Huang Wankang Wang Junwen A R Basu M Tatsumoto |
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| Institution: | (1) Institute of Geochemistry (Guangzhou Branch), Academia Sinica, 510640 Guangzhou;(2) Department of Geological Sciences, University of Rocherster, USA;(3) Branch of Isotope Geology, U. S. Geological Survey, Denver, USA |
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| Abstract: | The REE and Pb, Sr, Nd isotopes in three xenoliths from limburgite and scoria-breccias, including spinel-lherzolite, spinel-garnet-lherzolite
and phlogopite-gamet-lherzolite, were analysed. The REE contents of the xenoliths are 1.3 to 3.3 times those of the chondrites
with their REE patterns characterized by weak LREE depletion. The143Nd/144Nd values of whole rocks and minerals range from 0.51306 to 0.51345 with εNd=+ 8.2− +15.8,206Pb/204 Pb < 18.673, and207Pb/204Pb < 15.574. All this goes to show that the upper mantle in Mingxi at the depth of 67–82 km is a depleted mantle of MORB type,
with87Sr/86 Sr ratios 0.70237–0.70390. In Nd-Sr diagram the data points of whole rocks are all out of the mantle array, implying that
the xenoliths from Mingxi have more radiogenic Sr isotopes than those of the mantle array. |
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| Keywords: | garnet-Iherzolite xenolith REE Pb Sr Nd isotopes Mingxi |
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