中国三叠纪钾盐沉积——以四川为例

中国三叠系蒸发岩分布于华南,面积超过100×10⁴km²,发现硫酸钾盐及富钾卤水,钾盐矿物有杂卤石、无水钾镁矾、硫锶钾石及多钙钾石膏等,富钾卤水矿化度255~382g/l,含钾量4~49g/l。蒸发盆地的发展受控于古构造及古地理,经历了开放台地一局限台地一堰塞湖一盐湖的发展阶段。钾盐沉积后,经历多阶段的复杂演变。富钾卤水中的钾主要来自硫酸钾盐的深滤,其次来自蒸发浓缩卤水及火山灰吸附钾的释放。杂卤石与富钾卤水的钾同位素测年值分别为210~150Ma及264~150Ma,说明固液相钾盐同源。从地质背景及成矿环境预测,三叠系的钾盐类型只能是硫酸钾盐,主要目的层为T₁j^5~2及T₂l^4~2,主要成矿带为构造分异及钾异常明显的四川盆地东、西部,富钾卤水的储集取决于蒸发岩地层的含钾性、碳酸盐夹层的裂隙发育程度及构造控矿条件。找矿模型应是油气钾卤兼探。     

天然气中氮的地球化学特征

本文研究了天然气中氮的地球化学特征，并讨论了氮的成因。     

城乡地籍一体化管理的探讨

根据城镇、农村地籍管理数据组织方式上的许多共同点,对城乡地籍一体化管理的方法及系统原型设计进行了探讨。     

气象产品现代化分发技术与分发服务系统

论述自80年代中期起,在由大气遥感探测和数值天气预报所产生的大量气象产品的新形势下,如何最佳利用现代先进技术,对广大用户进行高效和实时分发的技术策略和方法。在概述80年代后期已蓬勃涌现的国外气象信息分发系统(MIDS)的基础上,介绍了我国第一个这类系统——武汉天气信息分发服务系统(WIDSS)的结构和特点。     

永年地震台伸缩仪EW向张性异常分析

针对河北永年地震台伸缩仪EW分量2015年5月11日起出现的加速拉张变化,从仪器工作状态、洞室环境、气象条件和外界环境干扰等方面,进行调查分析。利用3种荷载模型计算道路施工荷载变化可能引起的应变变化量,并结合其他形变测项变化特征进行论证,认为永年伸缩仪张性变化是区域应力场调整的结果。     

大别造山带岩石学结构和热结构及其地质意义

岩石学结构和热结构表明大别碰撞造山带是由两个不同岩石－构造单元叠置形成,代表两个深部地壳物质剖面。本文通过对高压、超高压岩石形成过程中岩石物理（密度）性质分析,指出大陆长英质地壳自身在特定岩石学结构情况下可以』俯冲至帽深度。低温、快速折返是缺乏同碰撞和碰撞后花岗岩类的主要原因。“浮沉子效应”是超高压岩石形成的折返的力学机制。     

基于历史航卫片的城市“隐形”活动断层精确定位——以大同盆地水峪断裂为例

活动断层是城市地震灾害的重要风险源，准确厘定活动断层的空间几何展布是有效降低城市地震灾害和开展活动断层避让的基础。而城市化建设对原始地貌的严重改造使得原先出露地表的活动断层成为"隐形"断层，难以准确确定断层的几何展布。大同盆地中部的水峪断裂北段位于马铺山东缘，断错地貌明显，但南段进入大同市御东新区被城市建筑物覆盖，成为"隐形"断层。研究基于大同地区1965年历史航片影像资料，结合1∶10000地形图，运用航片像对和航空立体摄影的方法重建了该地区的数字高程模型（DEM）和正射影像（DOM），重点对水峪断裂"隐形"段进行识别和定位，厘定了水峪断裂断层陡坎的几何展布特征。研究结果表明，水峪断裂北段山前陡坎线性特征明显，由影像可以准确解译出断层几何展布位置；水峪断裂南段可基于2000年之前的Keyhole历史遥感影像、DOM与DEM资料，根据断层两侧的颜色差异及陡坎高度差异，精确厘定该段的断层几何展布位置；DEM提取的地形剖面表明"隐形"段陡坎高度在19 m左右。同时，基于野外调查的断层剖面与浅层人工地震剖面证明该陡坎就是水峪断裂的位置，这也表明利用历史航卫片对城市"隐形"活动断层进行精确定位的方法是可行的。该研究不仅为大同地区的地震危险性评估提供了重要依据，而且为城市"隐形"活动断层探测提供了一个新的思路和途径。      

高精度CTD采水器控制系统的设计与分析

本系统是国家“８６３”任务中８１８－０２Ａ项目的重要组成部 和高精度ＣＴＤ测量仪联用,可以完成任意深度、任意时刻的采水控制功能,它采用国内外最新的技术和元器件,打破了原有的采水控制装置的设计思想,使采水器的动作完全合理准确。本文重点介绍其工作原理和关键技术。     

Intercomparison of NO_x, SO_2, O_3, and Aromatic Hydrocarbons Measured by a Commercial DOAS System and Traditional Point Monitoring Techniques

A field-based Intercomparison study of a commercial Differential Optical Absorption Spectroscopy (DOAS) instrument (OPSIS AB, Sweden) and different point-sample monitoring techniques (PM, based on an air monitoring station, an air monitoring vehicle, and various chemical methods) was conducted in Beijing from October 1999 to January 2000. The mixing ratios of six trace gases including NO, NO2, SO2, O3, benzene, and toluene were monitored continuously during the four months. A good agreement between the DOAS and PM data was found for NO2 and SO2. However, the concentrations of benzene, toluene, and NO obtained by DOAS were significantly lower than those measured by the point monitors. The ozone levels monitored by the DOAS were generally higher than those measured by point monitors. These results may be attributed to a strong vertical gradient of the NO-O3-NO2 system and of the aromatics at the measurement site. Since the exact data evaluation algorithm is not revealed by the manufacturer of the DOAS sys     

中国文昌红树林-海草床-珊瑚礁连续生境的鱼类连通性

Understanding the connectivity of fish among different typical habitats is important for conducting ecosystembased management, particularly when designing marine protected areas(MPA) or setting MPA networks. To clarify of connectivity among mangrove, seagrass beds, and coral reef habitats in Wenchang, Hainan Province,China, the fish community structure was studied in wet and dry seasons of 2018. Gill nets were placed across the three habitat types, and the number of species, individuals, and body size of individual fish were recorded. In total, 3 815 individuals belonging to 154 species of 57 families were collected. The highest number of individuals and species was documented in mangroves(117 species, 2 623 individuals), followed by coral reefs(61 species,438 individuals) and seagrass beds(46 species, 754 individuals). The similarity tests revealed highly significant differences among the three habitats. Approximately 23.4% species used two habitats and 11.0% species used three habitats. A significant difference(p0.05) in habitat use among eight species(Mugil cephalus, Gerres oblongus, Siganus fuscescens, Terapon jarbua, Sillago maculata, Upeneus tragula, Lutjanus russellii, and Monacanthus chinensis) was detected, with a clear ontogenetic shift in habitat use from mangrove or seagrass beds to coral reefs. The similarity indices suggested that fish assemblages can be divided into three large groups namely coral, seagrass, and mangrove habitat types. This study demonstrated that connectivity exists between mangrove–seagrass–coral reef continuum in Wenchang area; therefore, we recommend that fish connectivity should be considered when designing MPAs or MPA network where possible.