Special Xenoliths in an Aegirine-Augite Syenite Porphyry in Liuhe, Yunnan, China： Discovery and Implications

Three special types of xenoliths have recently been found in an aegirine-augite syenite porphyry in Liuhe,Yunnan,China.Petrographical,petrochemical,electron microprobe,and scanning electron microscopy studies indicate that pure calcite xenocrysts and quartz-bearing topaz pegmatite xenoliths result from the degassing of mantle fluids during their migration,and that black microcrystalline iron-rich silicate-melt xenoliths are the product of the extraction of mantle fluids accompanying degassing and are com...     

流感流行期大气环境特征及流感分级预报

分析了1998和2001年冬季我国北方地区流感大流行期的大气环境特征，得出冬季气温偏高，冷空气活动次数偏少且降温幅度增大；降水比上一年明显偏少且年际变化大、时间分布不均以及大气中烟尘含量高等大气环境特征与流感流行有密切关系。用1991～2001年的流感住院人数，气温、降水和能见度为因子，建立流感发生的预报方程。