八卦庙金矿床的绿泥石特征及成岩成矿意义

绿泥石是八卦庙大型金矿床的主要热液蚀变矿物，本文系统地研究了绿泥石的产状、矿物学、化学成分等特点。在此基础上应用Walshe的绿泥石六组分热力学模型计算了绿泥石形成的物理化学条件：形成温度247.6～335.1℃，lgfo2值为一27.35～37.99，lgfs2的值是－7．46～－13.02，与根据成矿期石英包裹体所计算的值相近。     

Element mobility during pyrite weathering: implications for acid and heavy metal pollution at mining-impacted sites

Based on back scattered electron images and electron micro-probe analysis results, four alteration layers, including a transition layer, a reticulated ferric oxide layer, a nubby ferric oxide layer and a cellular ferric oxide layer, were identified in the naturally weathering products of pyrite. These layers represent a progressive alteration sequence of pyrite under weathering conditions. The cellular ferric oxide layer correlates with the strongest weathering phase and results from the dissolution of nubby ferric oxide by acidic porewater. Leaching coefficient was introduced to better express the response of element mobility to the degree of pyrite weathering. Its variation shows that the mobility of S, Co and Bi is stronger than As, Cu and Zn. Sulfur in pyrite is oxidized to sulfuric acid and sulfate that are basically released into to porewater, and heavy metals Co and Bi are evidently released by acid dissolution. As, Cu and Zn are enriched in ferric oxide by adsorption and by co-precipitation, but they would re-release to the environment via desorption or dissolution when porewater pH becomes low enough. Consequently, Co, Bi, As, Cu and Zn may pose a substantial impact on water quality. Considering that metal mobility and its concentration in mine waste are two important factors influencing heavy metal pollution at mining-impacted sites, Bi and Co are more important pollutants in this case.     

英安流纹质岩浆的熔离实验

该实验用江西相山英安流纹岩加一定量的氟化物作为初始材料。在温度达875～900℃、压力0.5×10~8～1.0×10~8Pa时,含F和H_2O的英安流纹质岩浆的淬火产物中,有两种玻璃生成。其中一种玻璃呈小球出现,其成分相对富FeO、MgO、TiO_2。另一种玻璃,分布于小球之间,相对富SiO_2和Al_2O_3。实验表明,富含挥发分的酸性火山岩浆是比较容易熔离的。在流纹质火山岩中常见的长英质条带大多数不是浆屑,而是流纹质岩浆熔离的产物。     

江西相山碎斑熔岩成因和钾长石亚显微结构

相山碎斑熔岩含铁铝榴石(1340g/T)、红柱石等岩浆结晶副矿物,具S型火山岩地球化学和Nd、Sr、O同位素组成的特征。据光学测定和X光粉晶衍射测定,斑晶钾长石主要是高正长石或低透长石,有序参数δ′=-0.32—-0.01。在透射电镜下,出溶的细钠长石页片由共格拐点分解形成,成分波长约50—100nm;出溶的宽钠长石页片由无应力离溶作用形成,页片宽50—200nm。结果表明,碎斑熔岩是在火山环境下形成,而不是在深成环境下形成。     

成矿过程流体地球化学模拟及其矿床学意义：以江西银山矿床为例

本文将银山成矿体系为富含Ｈ２Ｓ，ＣＯ２的ＮａＣｌ体系，对Ｃｕ，Ｐｂ，Ｚｎ，Ａｇ和Ａｕ等金属元素在该体系降温过程中的地球化学行为和银山矿床的成矿过程进行计算机数字模拟，并与沸腾降温体系进行对比，证明了成矿体系地球化学演化对金属元素的迁移与沉淀具有得要影响。成矿硫体地球化学模拟在矿床成因，深部成矿预测和区域成矿规律研究中具有重要意义。     

Impact of climate warming on upper layer of the Bering Sea

The impact of climate warming on the upper layer of the Bering Sea is investigated by using a high-resolution coupled global climate model. The model is forced by increasing atmospheric CO₂ at a rate of 1% per year until CO₂ reaches double its initial value (after 70 years), after which it is held constant. In response to this forcing, the upper layer of the Bering Sea warms by about 2°C in the southeastern shelf and by a little more than 1°C in the western basin. The wintertime ventilation to the permanent thermocline weakens in the western Bering Sea. After CO₂ doubling, the southeastern shelf of the Bering Sea becomes almost ice-free in March, and the stratification of the upper layer strengthens in May and June. Changes of physical condition due to the climate warming would impact the pre-condition of spring bio-productivity in the southeastern shelf.     

江西东乡—相山中生代火山岩中富铝矿物的发现和成因意义

本文讨论在江西东乡上侏罗统虎岩组凝灰岩和相山鹅湖岭组碎斑熔岩中新发现的石榴石、红柱石等富铝硅酸盐矿物。石榴石呈自形的菱形十二面体,常包裹含钛磁铁矿、针状磷灰石等矿物包裹体。电子探针分析表明,东乡产出的石榴石为铁铝榴石,相山为钙质铁铝榴石。根据石榴石—熔体成分计算石榴石形成时温度为1060℃,压力为6×10~8Pa。二长温度计计算长石形成温度为785℃。从而证实石榴石为岩浆成因,厘定了本区火山岩是S型。     

三峡库区涪陵市主要环境地质问题及其防治对策

本文对三峡库区涪陵市重点移民迁建新址、南川—武隆矿区、国道３１９线的环境地质问题和市内的地质灾害进行了专门性分析论述,并提出了相应的防治对策。     

紫外线试验数据采集与控制系统研究

采用８０３１、８２７９、８２５５、ＡＤＣ０８０９、２７６４、６２６４等芯片及温敏电阻、紫外辐射和总辐射探头等传感器组成一实用的紫外线试验计算机数据采集与控制。系统可定时采集温度等气象要素,定时打开与关闭辅助紫外灯,并可通过打印机输出观测结果。     

中太平洋西部海底沉积物孢粉分析与C14年代测定

1978年12月-1979年8月,我国参加了世界气象组织主办的“第一次全球大气试验”.其间,我国科学考察船在中太平洋西部海域进行了海底沉积物调查研究工作.