Zircon SHRIMP age of Mesoarchaean meta-argilloarenaceous rock in the Anshan area and its geological significance

In order to better understand the early continental evolution of the Anshan area, one ofthe typical Precambrian distribution areas of the North China Craton, the geochronology and REEcomposition of the zircons from the meta-argillo-arenaceous rock occurred as enclave in 3.1 GaLishan trondhjemite are studied by using SHRIMP ll ion microprobe. It is indicated that the Pa-leoarchaean is a very important continental formation period in the Anshan area and 3.2 Ga can beregarded as the boundary between the Paleoarchaean and Mesoarchaean.     

东南极拉斯曼丘陵及其邻区的泛非热事件

本文以Sm-Nd内部等时年龄,单颗粒锆石~(207)Pb-~(206)Pb逐层蒸发年龄和黑云母~(40)Ar/~(39)Ar坪年龄为根据,论述了东南极拉斯曼丘陵泛非热事件。野外地质和同位素年代学的证据表明,该热事件不仅有区域强烈的部分熔融,而且还有低压麻粒岩相变质。它的产生可能与冈瓦纳古陆的最终形成有关。     

切削微角锥棱镜型超高定向反射膜的分析与测试

采用几何光学法对切削微角锥棱镜薄膜结构单元的反射特性进行理论分析,采用光学仿真软件对该结构单元的反光性能进行模拟验证,并与传统微角锥棱镜薄膜结构单元进行对照.结果表明,理论中,当平行光垂直于结构底面入射并忽略吸收时,该切削结构薄膜单元可实现完全定向反射,而相同条件下,传统微角锥棱镜结构薄膜单元定向反射率为66.7%.模拟仿真的定向反射率分别是92.3%和62.4%.建立了薄膜定向反射率测量方法,对具有上述两种结构单元的薄膜样品的定向反射率进行测试,测试结果分别为67.8%和39.5%.