繁昌火山岩盆地及其周边地区重磁异常特征及铅锌矿成矿预测

繁昌火山岩盆地及其周边地区具有良好的铁铜多金属矿的成矿地质条件,本文基于1:25000重磁调查成果,结合化探、遥感、地质等资料,建立了繁昌火山岩盆地及其周边地区的基本构造格架;结合铅锌矿典型矿床成矿特征,圈定了铅锌矿成矿远景区及靶区,并对铅锌矿进行了成矿预测.     

中国东部不同气候带近60年冬季最低气温变化特征及环流分析

使用中国东部1951—2007年冬季最低气温资料和NCEP/NCAR再分析资料,分析了中国东部热带、副热带、温带地区冬季最低气温的年际、年代际变化及其大气环流特征。结果表明:中国东部热带、副热带、温带地区冬季最低气温均呈上升趋势,其中温带最显著,趋势倾向率为0.62℃.(10a)-1。3个气候带冬季最低气温在1980年代中期和1990年代初发生了突变,突变后热带、副热带、温带地区最低气温分别比突变前上升了0.99,1.37和2.29℃。3个气候带冬季极端低温日出现频率均呈显著的下降趋势,其中温带下降趋势最为明显,趋势倾向率为2.3%.(10a)-1。500 hPa环流形势、海平面气压场以及青藏高原地面风特征表明,冷年东亚大槽比暖年深,西伯利亚高压比暖年强,高原偏北风比暖年频次高、风速大。700 hPa风场上,中高纬北风风速及低纬南风风速变化存在差异,从而在一定程度上影响了3个气候带冬季最低气温的变化特征。     

沉积物中水合物热物理性质测试实验初探

设计了一套水合物热物理特性模拟实验测试装置,核心技术为3套不同结构的热-TDR探针:双棒型集成探针、单棒探针和平行板探针。以双棒型热-TDR探针为例,对沉积物中水合物及多种介质的热物理性质进行测定,实验结果比较理想。     

怒江断裂带南段道街盆地第四纪构造活动特征

上新世末以来滇西地区发生大面积掀斜隆升构造运动, 同时伴随块体的差异性升降运动。 在这种构造背景下, 怒江断裂带南段形成了一系列断陷盆地, 其中道街盆地是面积最大的一个盆地。 本文利用野外地质考察、 钻探和后差分GPS实测剖面等方法对该盆地第四纪地层和控盆断裂进行研究, 认为道街盆地控盆断裂最新活动时代为中—晚更新世之间, 而盆地内部断层晚更新世以来仍有活动表现。     

高边坡岩体渐进性破坏粘弹塑性有限元数值模拟

根据边坡实际地质模型 ,基于弹塑性与粘弹 -粘塑性理论的本构方程 ,通过有限元模拟分析 ,定量地揭示和模拟再现了高边坡岩体破裂、变形、破坏及失稳前后锁固段岩体渐进性破坏的机制和过程 ,探讨了高压水流作用下滑坡启程剧动的破坏机理。     

Geochemical evaluation of cultivated soil elements in Pucheng County of Fujian Province

Pucheng County in Fujian Province is an important production area of rice and barley. The soil environmental quality and the content of beneficial nutrients directly affect the yield of crops and the quality of products. Based on the 1:50,000 soil geochemical survey results in Pucheng County, the plant essential nutrient elements, heavy metal elements, and beneficial element Se in the study area were evaluated according to the relevant standards and norms, so as to provide scientific basis for the development of high-quality land in the study area, the planting of featured agricultural products and the construction of high-standard farmland. The evaluation results show that: Essential macro elements of organic matter,N and alkali-hydrolyzed nitrogen are generally in rich-moderate state; P is generally in moderate-deficient state, and rapid available phosphorus is in deficient-very deficient state. K and rapid available potassium is in abundant state. Essential moderate element S is generally in rich-moderate state. Essential trace elements Fe, B and Mn are in a state of great deficiency. Mo is generally in very rich-rich state, and Zn and Cl are also mainly in very rich-rich state. Beneficial element Se is in an appropriate state, and the soil area rich in selenium is 6.41 km². Overall, the heavy metal elements in the soil of Pucheng County have reached the first grade soil environmental quality standard and have the ecological conditions for the development of healthy agricultural products.