P588.34 P597
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
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。
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.
葛宁洁 柏林 等.2001.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,75(3):379-384.
GE Ningjie, LI Huiyu, QIN Liping, HOU Zhenhui, BO Lin) Department of Earth, Space Sciences, University of Science, Technology of China, Hefei, Anhui, ) Geological Society of Anhui Province, He fei, Anhui,.2001. Sr, Nd and Pb Isotope Geochemistry of Granulites and TTG Gneisses from the North Dabie Mountains[J]. Acta Geologica Sinica,75(3):379-384.
