华夏地块古元古代陆壳再造: 锆石微量元素与U-Pb和Lu-Hf同位素证据

应用LA-ICPMS 锆石U-Pb微区定年和锆石微量元素及Hf同位素分析方法, 对浙西南景宁三枝树片麻状花岗岩进行了系统的研究. 花岗岩中几乎所有的锆石都显示典型的韵律振荡环带, Th/U比值较高(均大于0.1), 锆石稀土元素球粒陨石标准化配分曲线呈左倾型, 并显示明显的正Ce异常和负Eu异常, 表明这些锆石为岩浆成因. 锆石U-Pb定年得到花岗岩的成岩年龄为(1860 ± 13) Ma (MSWD = 0.084), 锆石εHf (1860)值均为较低的负值(-15.6 ~ -10.0), 二阶段Hf模式年龄T_DM2为3.1~3.4 Ga, 指示三枝树片麻状花岗岩为古-中太古代陆壳再造的产物. 主量和微量元素研究表明, 三枝树花岗岩为准铝质高钾钙碱性花岗岩, 具典型的铝质A型花岗岩特征, 形成于造山后的伸展拉张环境. 华夏地块古元古代陆壳再造事件(1.86 Ga)很可能记录了Columbia超大陆聚合向裂解转折的信息.     

Activation for Photoluminescence Emission on NanoSilicon Prepared in Oxygen or Nitrogen Environment

The photoluminescence(PL)dynamics of nano-silicon prepared in various environments is investigated,which involves the emission in nanostructures related to a wider band from 550 nm to 900 nm and the localized states emission at 694 nm,605 nm,604 nm and 560 nm.It is observed that the sharp PL peak on the samples prepared in nitrogen has the shape of single tip near 605 nm,but the shape of twin tips always occurs in the two sharp peaks on the samples prepared in oxygen.The threshold behavior and the optical gain are discovered in the PL emission at 694 nm,605 nm and 604 nm.The experiments demonstrate that the optimum pressure to prepare samples in oxygen for the enhancement of emission near 700 nm is about 10~100 Pa,and the optimum one in oxygen for the enhancement of emission near 600 nm is about 1/10~1 Pa,while in high vacuum(10μPa) the PL emission becomes weaker.