| Chemical and Isotopic Characteristics of Gabbroic Xenoliths from Hannuoba,China |
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| 作者姓名： | 陈道公 王银喜 |
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| 作者单位： | [1]DepartmentofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026 [2]ModernAnalysisC,UniversityofScienceandTechnologyofChina,Hefei230026 |
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| 摘 要： | Nine pieces of gabbroic xenoliths from Hannuoba were examined for their major and trace elements and Nd,Sr and Pb isotopes.The results show that the gab-broic xenoliths are of more mafic basaltic composition .Their abundances show narrow variations in major elements.The trace element contents are highly variable in contrast with those of host basalts and lherzolite xenoliths.The gabbroic xenoliths are rich in Nd(0.51159-0.51249),Sr(0.70491-0.70768) and low in radiogenic Pb(16.283-17.046, 15.191-15.381 and 36.999-37.476),significantly different from basalts and lherzolites in isotopic space.The calculated Nd and Pb model ages are about 3.0-3.5 Ga.The rocks have relatively low equilibrium T(-850℃) and P(0.8-0.9 Gpa).They could be inter-preted to be the product of upper mantle melting at the boundary between the lower crust and the upper mantle.Their chemical and isotopic variations can be ascribed to different degrees of melting,segregation and long-term evolution.
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| 关 键 词： | 地质构造 化学特征 辉长岩 捕虏体 钕同位素 锶同位素 铅同位素 |
Chemical and isotopic characteristics of gabbroic xenoliths from Hannuoba,China |
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| Chen Daogong,Zhi Xiachen,Li Binxian,Wang Yinxi,Yang Jiedong.Chemical and Isotopic Characteristics of Gabbroic Xenoliths from Hannuoba,China[J].Chinese Journal of Geochemistry,1995,14(3):276-287. |
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| Authors: | Chen Daogong Zhi Xiachen Li Binxian Wang Yinxi Yang Jiedong |
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| Institution: | (1) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei;(2) Modern Analysis Centre, Nanjing University, 210008 Nanjing |
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| Abstract: | Nine pieces of gabbroic xenoliths from Hannuoba were examined for their major and trace elements and Nd, Sr and Pb isotopes.
The results show that the gabbroic xenoliths are of more mafic basaltic composition. Their abundances show narrow variations
in major elements. The trace element contents are highly variable in contrast with those of host basalts and lherzolite xenoliths.
The gabbroic xenoliths are rich in Nd (0.51159–0.51249), Sr (0.70491–0.70768) and low in radiogenic Pb(16.283–17.046, 15.191–15.381
and 36.999-37.476), significantly different from basalts and lherzolites in isotopic space. The calculated Nd and Pb model
ages are about 3.0–3.5 Ga. The rocks have relatively low equilibriumT(~850°C) andP (0.8–0.9 GPa). They could be interpreted to be the product of upper mantle melting at the boundary between the lower crust
and the upper mantle. Their chemical and isotopic variations can be ascribed to different degrees of melting, segregation
and long-term evolution.
This project was granted by the National Natural Science Foundation of China. |
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| Keywords: | gabbroic xenolith Nd Sr and Pb isotopes Hannuoba |
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