| 大别山麻粒岩和TTG片麻岩的Sr,Nd,Pb同位素地球化学 |
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| 引用本文： | 葛宁洁,柏林,等.大别山麻粒岩和TTG片麻岩的Sr,Nd,Pb同位素地球化学[J].地质学报,2001,75(3):379-384. |
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| 作者姓名： | 葛宁洁 柏林 |
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| 作者单位： | 1. 中国科学技术大学地球与空间科学系,合肥,230026
2. 安徽省地质学会,合肥,230001 |
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| 基金项目： | 国家自然科学基金(编号49673197)，“大陆深俯冲和折返过程中壳慢及岩石圈和软流圈之间的相互作用”项目(编号 G1999075503)资助的成果 |
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| 摘 要： | 北大别4个麻粒岩和4个TTG片麻岩样品的Sr,Nd同位素分析结果表明，样品普遍具有较高的锶同位素比值（^87Sr/^86Sr=0.7066-0.7461)，较低的Nd同位素比值（^143Nd/^144Nd=0.5108-0.5124)，表现出明显的壳源特征，结合铅同位素的组成来看，北大别麻粒岩及TTG片麻岩的同位素成分相当于－下地壳。岩石的特源为古老的地壳，大约在2－3Ga之间，少数样品的同位素特征可能暗示源区有年轻地壳物质的加入。
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| 关 键 词： | 麻粒岩 TTG片麻岩 大别山 锶 钕 铅同位素 地球化学 |
| 修稿时间： | 4/2/2001 12:00:00 AM |
Sr, Nd and Pb Isotope Geochemistry of Granulites and TTG Gneisses from the North Dabie Mountains |
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| GE Ningjie,LI Huiyu,QIN Liping,HOU Zhenhui,BO Lin.Sr, Nd and Pb Isotope Geochemistry of Granulites and TTG Gneisses from the North Dabie Mountains[J].Acta Geologica Sinica,2001,75(3):379-384. |
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| Authors: | GE Ningjie LI Huiyu QIN Liping HOU Zhenhui BO Lin |
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| Institution: | GE Ningjie,LI Huiyu,QIN Liping,HOU Zhenhui,BO Lin Department of Earth and Space Sciences,University of Science and Technology of Chin,Hefei,Anhui, Geological Society of Anhui Province,He fei,Anhui |
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| Abstract: | Sr, Nd and Pb isotope analysis of four granulite samples and four gneiss samples from the northern Dabie Orogen were carried out. All the samples have relatively high Sr isotope ratios (87Sr/86Sr=0. 706 - 0. 746) and relatively low Nd isotope ratios (143Nd/144Nd= 0. 5108-0. 5124). These results together with Pb isotopic compositions suggest that the isotopic compositions of granulites and TTG gneisses of the northern Dabie Orogen are equal to those of the middle-lower crust. The TDM values show that these rocks are very old, c. 2-3Ga. The Sr-Nd-Pb isotopic characteristics of some samples imply the addition of younger crustal materials in their sources. |
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| Keywords: | Sr Nd Pd isotope granulite TTG gneiss the North Dabie orogen |
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