Science. 1985 Oct 25;230(4724):436-9. doi: 10.1126/science.230.4724.436.
Samarium-neodymium isotopic data on whole rocks and minerals of the Sudbury Complex in Canada gave an igneous crystallization age of 1840 +/- 21 x 10(6) years. The initial epsilon neodymium values for 15 whole rocks are similar to those for average upper continental crust, falling on the crustal trend of neodymium isotopic evolution as defined by shales. The rare earth element concentration patterns of Sudbury rocks are also similar to upper crustal averages. These data suggest that the Sudbury Complex formed from melts generated in the upper crust and are consistent with a meteoritic impact.
对加拿大萨德伯里杂岩全岩和矿物的钐-钕同位素数据给出了火成结晶年龄为 1840 ± 21×10^6 年。15 个全岩的初始 ε 钕值与上地壳平均值相似，落在由页岩定义的钕同位素演化地壳趋势上。萨德伯里岩石的稀土元素浓度模式也与上地壳平均值相似。这些数据表明，萨德伯里杂岩是由在上地壳中产生的熔体形成的，与陨石撞击一致。
