weight: bold" lang=EN-US>The Source of Old Terrestrial Rocks: Evidence from <SUP>146Sm-¹⁴²Nd Isotopes of Archean Rocks

• 责任者：Pi Qiaohui (Faculty of Earth Science and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Chen Yuelong
• 刊名：Geology in China
• 出版年：2010
• 卷期：37(1)
• 关键词：太古宙 ; Archean ; 同位素地球化学 ; isotope geochemistry ; 地幔 ; mantle
• 页码：p.88-93
• 图表：2 illus., 15 refs.
• 分类号：0400
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

Through the construction of the <SUP>146Sm-¹⁴²Nd system and the application of Hadean (4.6～4.0 Gy) mantle evolution, the authors get to know the evolutionary process of this early epoch. Based on the ¹⁴²Nd study of Archean rocks, the authors hold that early mantle was an inhomogeneous system because of the mantle differentiation. Canadian Nuvvuagittuq greenstone originated from the mixture of enriched and depleted mantle, with the enriched mantle playing the dominant role. Greenland mixtite and Isua metamorphosed sediments originated from depleted mantle whereas North Australian Yilgam gneiss originated from the mixture of enriched and depleted mantle, with the depleted mantle being dominant.