辽东半岛的幔源He渗漏

研究了辽东半岛温泉气体的HE浓度和HE同位素的组成特征 .3HE/4HE值分布于 0 .14~ 0 .72rA之间(rA 为大气的3HE/4HE比值 1.4 0x 10 - 6 ) ,HE同位素组成与HE浓度和4 HE/2 0 nE比值呈现线性相关 ,表明有少量地幔HE(约 9% )抵达地表 .温泉气体的3HE/4HE值与研究区的大地热流呈现相似的空间分布特征 ,说明两者具有一定的成因关系 .地幔局部熔融形成的岩浆很可能沿深大断裂侵入地壳 .幔源HE、热流异常以及地震活动在空间上的耦合可能反映了地幔脱气与地震活动的内在联系 .国家自然科学基金!(批准号:49133009)资助项

Glow discharge growth of SnO2 nano-needles from SnH4

Single crystalline SnO2 nano-needles with length up to 6-7 mum and diameter less than 300 nm are synthesized on an Au-coating porous silicon substrate from SnH4 source via a glow discharge process

Helium and oxygen isotopic evidence on the exchange of water between the West Pacific and the South China Sea

研究了西太平洋海域 (7°～ 2 6°N ,1 2 2°～ 1 30°E)不同深度海水的氧、氦同位素组成和分布特征 .结果表明 ,巴士海峡附近海域几个深度上δ18O等值线均向东弯曲 ,δ3He等值线也出现了类似的分布特征 ,可能反映了南海海水与黑潮水的混合作用 .氧、氦同位素的研究结果为南海海水通过巴士海峡侵入了西太平洋提供了地球化学证据The composition and distribution of helium and oxygen isotopes in samples of seawater obtained at depths from the surface to 300 m in the West Pacific(7°～26°N,122°～130°E) are discussed in detail. The results show that both δ 18 O and δ 3He isoline extend eastward in the Pacific side of the Luzon Strait, which may suggest that the South China Sea water intrudes into the West Pacific by the Luzon Strait.国家自然科学基金资助项目!(4 91330 0 9);; 国家博士后科学基金资助项

Oxygen and hydrogen isotope composition of meteoric water in the tropical West Pacific Ocean

测定了西太平洋（７．５°一３１°Ｎ，１２３°～１３２°Ｅ）１９８９年９～１０月间雨水的δＤ和δ１８Ｏ值，结果表明该区雨水的氢、氧同位素组成呈现与中、高纬度地区明显不同的分布特征．雨水的δ值与降水点的纬度没有直接的因果关系，而与季风流场明显相关．沿季风流动方向雨水的δ值逐渐减低，这可用降水云团的瑞利分馏过程解释。雨水 δＤ和 δ１８Ｏ的分布大致反映了研究区季风流场的特征。 【英文摘要】 δD and δ18O values in samples of meteoric water obtained in the West Pacific Ocean (7. 5° - 31°N, 123° - 132°E ) during the autumn cruises of 1989 are measured. The results show that there are obviously different distribution features of oxygen and hydrogen isotopes between the survey area and middle and high-latitude areas. A gradient variation of δ value along the direction of the monsoon is exhibited in the survey area in the West Pacific O- cean, which can be attributed to Releigh isotope fractionation ...国家自然科学基金!（编号：49133009