中国东部A型花岗岩D-18O亏损机理：去气vs水/岩交换

中国东部A型花岗岩稳定同位素地球化学研究表明，δ18O组成基本正常的苏州与福州A型花岗岩δD亏损可能分别受单阶段与边疆岩浆去气作用的影响，后期大气降水的扰动相对较弱；而δD-δ18O同步亏损特征明显的碾子山与山海关岩体则主要受后期大气降水亚固态交换机理的制约；青岛复式岩基相对较为复杂，可能受岩浆去气与晚期大气降水的联合作用。     

焦作市雷暴潜势预报及临近监测预警系统

在对焦作市雷暴气候特征分析的基础上,利用T213预报场资料,制作焦作市雷暴趋势预报;采取双判据修正K指数,提出焦作市雷暴稳定度界定指标,做雷暴潜势预报。对1984—2004年的历史资料,分别计算出30个物理量场,形成1°×1°格点资料开展雷暴强度等级判别;综合卫星、雷达、闪电定位仪资料,建立雷暴监测预警系统。该系统采用VB语言编程,根据每天08时、20时MICAPS资料自动完成天气分型、物理量计算、预报指标提取和预报方法的判别,输出预警结论,制作雷暴落区预报。在2005—2006年预报工作中取得较为满意的效果。     

岩浆岩体系氧同位素分馏系数的理论计算

The increment method is applied to calcuation of oxygen isotope fractionation factors for common magmatic rocks by using oxygen isotope indices for known minerals.The results show that there are some differences in the degree of ¹⁸O-enrichment for the different types of magmatic rocks,and their sequence of ¹⁸O-enrichment is reckoned as follows acid rocks > neutral rocks > basic rocks > ultrabasic rocks.Two sets of internally consistent fractionation factors for phenocryst-lava systems at temperacture above 1000K and for rock-water systems in the temperature range of 0 to 1200℃ are acquired, respectively.The theoretical calibrations are consistent with the data from hydrothermal experiments and empirical estimates.The present results can be used to quantitatively determine the history of water-rock exchange and to serve geological thermometry for various magmatic rocks (especially extrusive rocks containing phenocryst).