旋挖钻机卡钻原因及其对策

卡钻是旋挖钻机施工中易出现的、危害较大的事故之一。根据工程经验，分析了卡钻的原因，总结了预防及处理措施。     

闽粤地区铁矿床成因研究

闽粤地区铁矿床存在三种成因类型，海底热液喷气沉积型，夕卡岩化海底热液气沉积型和风化淋滤海底热液喷气沉积型，建立了海底热液喷气沉积型铁矿床的宏观和微观标志，探索了新的找矿思路。     

川西义敦地区的斧石矿及其矿床地质特征

川西义敦某地发现罕见的斧石矿床，产于黑云二长花岗岩与中下三叠统列衣组外接触带的夕卡岩中，为中高温、中温热液接触交代形成的矿床，形成时代为早第三纪。矿物呈紫色，透明至半透明，据化学成分确定为锰铁斧石。晶粒粗大，颜色鲜艳夺目，无裂纹，可作为较高档次的宝石原料。     

30—50 天振荡动能特性及其与平均气流正压不稳定能的转换

该文利用冬季500 hPa的欧洲中心（ECMWF）网格点逐日资料，分析了30—50天振荡的E矢量分布、动能特性及平均气流的正压不稳定能转换特征，从而得到:30—50天振荡的能量传播与西风急流的位置有密切的关系，在西风大风速区作纬向能量传播，在小风速区作指向赤道的经向传播；在急流的出口区有较强的正压能转换，低频振荡从基本流中获得能量，使这里的低频动能最大，并表现出较强的正压特性，与低纬度的斜压特性形成鲜明对照。     

剥离断层—50矿床的主控因素

燕山晚期的拉张构造环境，在深断裂带或裂陷带两侧形成了各种不同层次的拆离滑脱，包括剥离断层。信江裂陷带南侧的Ｆ１５剥离断层（系统）控制了５０矿床的矿质来源，矿质沉淀及矿体定位。该断层是控矿的主导因素。文中还讨论了剥离断层的找矿意义。     

Fluid Inclusion Studies of the Skarn—type Tin Mineralization at Red—A—ven,Northwest Dartmoor,England

Two principal hydrothermal events have been recognized ,which resulted in the tin-bearing skarns at Red-A-ven ,Northwest Dartmoor.Tin was enriched during both the early (occurring as tin-bearing andradite) and late hydrothermal events (mainly as malayaite stannite and cassiterite,accompanied by boron silicates and minor tungsten).Thermometric measurements of fluid inclusions in diopside,garnet,malayaite,tourmaline-quartz and axinite were carried out,suggesting that the early skarns were formed at the temperature above 600℃and the salinities ranging from 10 to 20 wt.% NaCl eq.while the late skarns at the temperatures of 350-460℃ and the salinities ranging from 30 to 50wt.% NaCl eq.The estimated minimum depths are 2856m(850 bar) for the early event and 2526m(185 bar) for the late event.The birefringence of the andradite might be related with the superimposition of late hydrothermal fluids.     

Multistage Carbonatization and Mineral Geochemistry of a Skarn—type Copper Deposit at Tongshan ,Guichi

The Tongshan copper deposit at Guichi can be considered as a skarn-type copper deposit. Multi-stage carbonatization was well developed in the skarn zone and copper-bearing orebodies. Mineralogy, mineral chemistry and stable isotope data allow it to be divided into five stages: (1) carbonatization of single calcite crystals in the skarn stage; (2) calcite carbonatization in the oxide stage; (3) carbonatization in the early sulfide stage; (4) carbonatization in the late sulfide stage; and (5) carbonatization in the post-sulfide stage. Carbonatization in the early sulfide stage is, among other things, closely related to copper mineralization and is one of the alteration indicators of copper mineralization of this type. C. O, Rb and Sr isotopic studies indicate that the calcites of skarn and oxide stages were formed from hydrothermal solutions predominated by magmatic water, and those of sulfide stage were formed from hydrothermal solutions mainly involving heated meteoric water. The former was formed in the environment wherefO ₂ (fO ₂ < 10⁻³³ and 10⁻³³< fO₂>10⁻³⁶)(pH = 7–8) is high as compared with the latter (10⁻³⁵< fO₂< 10⁻³⁸; pH = 5–7).     

安徽省WRF模式短时强降水的预报检验

利用2005—2015年安徽省内1162个站点观测资料简要分析了短时强降水的时空分布特征,并利用中国气象局CLDAS(CMA Land Data Assimilation System)近实时降水资料检验2012—2015年安徽省WRF(Weather Research and Forecast)模式对短时强降水的预报性能,探讨不同空间插值方法、检验方法对预报效果的影响,以评估模式预报短时强降水的应用价值和使用注意事项。结果表明:短时强降水主要发生在大别山区和皖南山区;一年中发生次数呈单峰分布,集中于6—8月;日变化呈双峰状,强峰为北京时间下午15:00—19:00,弱峰为06:00—09:00,两个低谷分别为01:00、12:00前后。在两分类评分TS(Threat Score)检验中,各个季节评分均十分低,插值方法对TS评分影响不大。邻域法FSS评分(Fractions Skill Score)检验中,春季FSS评分低,最高仅可达15%,空间窗、时间窗、时间超前或滞后变化对FSS评分的影响不如夏季、秋季明显;夏季,不考虑时间窗时,单独的时间超前或滞后不能提高预报准确率;秋季,模式分别滞后1h或滞后2h预报结果优于同期预报,而超前1h或超前2h预报结果低于同期预报,表明秋季WRF模式对短时强降水的预报有一定滞后性。