Bioleaching behavior and surface property of pyrites in different metallogenic conditions

The bioleaching behaviors and surface properties of pyrites in two metallogenic conditions by Sulfoba- cillus thermosulfidooxidans were investigated by adsorption tests, zeta-potential measurements and bioleaching ex- periments. It is found that there were significant differences in the microorganism adsorption capacity, electrokinetic properties and bioleaching behaviors for the two pyrites. The S. thermosulfidooxidans adsorption capacity on high temperature hydrothermal （hy high_temp） pyrite is larger than that on sendimentary coal （sed_coal） pyrite. It may be that more extracellular polymeric substances （EPS） is produced when it is difficult for microorganism to make use of hy high temp pyrite as source of energy, and get leaching bacteria attached to pyrite by means of EPS. The zeta-potential measurements indicated that zeta-potential value of hy_high_temp pyrite was higher than that of seal_coal pyrite in pH range of 2-10. After interacting with cells, the IEP （Iso-Electric Point） of hy_high_temp pyrite shifted obviously to that of bacterial. In contrast, the IEP of sed coal pyrite remained unchanged nearly. The bioleaching results showed that hy high_temp pyrite did not dissolve and the leaching extent was only 0.82%, while that of sed_coal pyrite was 34.59%. Attempts were taken to illustrate the remarkable difference between bioleaching results of two pyrites from a semiconductor energy band theory perspective.     

重庆辐射雾一维数值模式预报

本文将所建立的重庆雾一维模式简化移植到微机上,主要进行辐射雾的形成时间和浓雾预报。模式在386机上作12小时预报计需机时25分钟。通过对1990年11月～1991年2月24次的个例计算,预报成功率达70％,雾形成时间平均误差为1.7小时。     

Dextral-Slip Thrust Faulting and Seismic Events of the Ms 8.0 Wenchuan Earthquake,Longmenshan Mountains,Eastern Margin of the Tibetan Plateau

Dextral-slip thrust movement of the Songpan-Garze terrain over the Sichuan block caused the Ms 8.0 Wenchuan earthquake of May 12, 2008 and offset the Central Longmenshan Fault (CLF) along a distance of-250 km. Displacement along the CLF changes from Yingxiu to Qingchuan. The total oblique slip of up to 7.6 m in Yingxiu near the epicenter of the earthquake, decreases northeastward to 5.3 m, 6.6 m, 4.4 m, 2.5 m and 1.1 m in Hongkou, Beichuan, Pingtong, Nanba and Qingchuan, respectively. This offset apparently occurred during a sequence of four reported seismic events, EQ1-EQ4, which were identified by seismic inversion of the source mechanism. These events occurred in rapid succession as the fault break propagated northeastward during the earthquake. Variations in the plunge of slickensides along the CLF appear to match these events. The Mw 7.5 EQ1 event occurred during the first 0-10 s along the Yingxiu-Hongkou section of the CLF and is characterized by 1.7 m vertical slip and vertical slickensides. The Mw 8.0 EQ2 event, which occurred during the next 10-42 s along the Yingxiu-Yanziyan section of the CLF, is marked by major dextral-slip with minor thrust and slickensides plunging 25°-35° southwestward. The Mw 7.5 EQ3 event occurred during the following 42-60 s and resulted in dextral-slip and slickensides plunging 10° southwestward in Beichuan and plunging 73° southwestward in Hongkou. The Mw 7.7 EQ4 event, which occurred during the final 60-95 s along the Beichuan-Qingchuan section of the CLF, is characterized by nearly equal values of dextral and vertical slips with slickensides plunging 45°-50° southwestward. These seismic events match and evidently controlled the concentrations of landslide dams caused by the Wenchuan earthquake in Longmenshan Mountains.     

四川地区早志留世岩相古地理

四川地区早志留世沉积岩系形成于晚奥陶世-早志留世的前陆盆地演化阶段。早志留世龙马溪期主要为局限的深水陆棚环境。小河坝期表现为浅水陆棚的扩展和深水陆棚的萎缩,沉积分异作用加剧,呈现出碳酸盐台地、浅水陆棚、深水陆棚共存的古地理格局。韩家店期主要为潮坪-浅水陆棚沉积。早志留世四川地区表现为沉积盆地充填变浅和海退式的演化趋势,具多物源的混合型陆棚沉积性质,沉积体系展布和沉积演化主要受包括黔中古隆起在内的前陆隆起带的NW方向扩展作用控制。有利储集体的发育主要取决于沉积环境,浅海砂坝和碳酸盐台地边缘相是有利的储集相带,如川东地区的“小河坝砂岩”和川南及川北地区发育的生物礁灰岩。     

三峡库区优质柑橘产业带建设土地整理模式

以三峡库区优质柑橘产业带建设土地整理模式研究为目标,以重庆市万州区甘宁镇永胜等两个村土地整理项目（标准化柑橘园）为例,从工程、生物技术方面探讨了改土和配套农业产业化基础设施建设。研究表明：以三峡库区优质柑橘产业带建设目标的土地整理模式必须立足库区复杂多样的立地条件和生态一经济功能差异,配套服务早、中、晚熟不同柑橘品种产...     

Special and seasonal variations of trace metals in PM_(10) in Chongqing

1Introduction Tracemetalsarereleasedtotheatmosphereduring combustionoffossilfuelsandwood,aswellasemis sionsfromavarietyofprocessesactingoncrustalmin erals,includingvolcanism,erosionandsurfaceweath ering.Onaglobalscale,resuspendedsurfacedusts havemadeagreatcontributiontothetotalnaturale missionoftracemetalstotheatmosphere,withCr,Mn andVaccountingfor>50%andCu,Mo,Ni,Pb,Sb andZnaccountingfor>20%,whilevolcanicactivity probablygeneratedasmuchas20%atmosphericCd,Hg,As,Cr,Cu,Ni,PbandSb(Pacyna,19…     

重庆綦江中白垩统夹关组恐龙足迹群的发现及其意义

记述了来自重庆綦江中白垩统夹关组恐龙足迹群，命名了甲龙亚目的中国綦江足迹（Qijiangpussinensis ichnogen．et ichnosp．nov．）、兽脚亚目的敏捷舞足迹（Wupusagilis ichnogen．etichnosp．nov．）和鸟脚亚目的炎热老瀛山足迹（Laoyingshanpus torridus ichnogen．etichnosp．nov．）和莲花卡利尔足迹（Caririchniumlotusichnosp．nov．）等新属种。中国綦江足迹是中国首次发现甲龙类的足迹。莲花卡利尔足迹提供了鸭嘴龙类在各发育阶段所留下不同的足迹。     

重庆市主城区降雨酸度的影响因子分析

重庆市是我国酸雨较严重的地区之一，其酸沉降状况具有代表意义。本分析了重庆市2000年和200l年的降雨指标(离子组分、pH、电导率)和空气质量指标(SO2和NO2)，降雨指标采用离子色谱法和电极法，空气质量指标采用紫外脉冲荧光法和化学发光法分析。结果表明，大气颗粒物、SO2及NO2对降水的酸度有不同影响。大气颗粒物中的碱式钙盐可明显降低雨水酸度，其可能来源为建筑施工；含有SO4^2-、NO3^-和NH4^ 的酸式盐可有效增加雨水酸度。大气中的SO2对降雨酸度增高贡献较大，而NO2贡献不明显。较小的[NO3^-]/[SO4^2-]值(0．125)显示重庆市的固定源的污染比流动污染源更强。     

桑沟湾海域物理自净能力分析

在桑沟湾汁算潮流场基础上,采用ADI法,建立了拉格朗日余流模型和平流——扩散输运模型。对排污口的污水输运轨迹进行了跟踪,并预测了桑沟湾1995年、2000年的水质,绐出了COD浓度分布的发展趋势,指出桑沟湾是一个水交换滞缓、物理自净能力较弱的海区。据此可为桑沟湾沿岸的排污口选址提供依据。     

运动速度对褶皱—冲断带的构造变形样式的影响分析——来自硅胶和石英砂组合模型的模拟启示

运动速度与构造样式之间或许存在一定的内在联系,充分认识它们之间的关系对理解自然界的构造变形演化过程具有十分重要意义。为此,笔者等结合野外露头观察,开展了脆—韧性结构条件下,不同的变形速率对褶皱—冲断带的构造样式影响的物理模拟测试分析。结果表明：(1)高应形速率形成以前冲为主的构造样式,中等应形速率形成以前冲和后冲为主的构造样式,而低应形速率则形成以纯后冲为主的构造样式。(2)构造变形样式的差异主要是物质内部的应力状态所决定的：褶皱—冲断带的根带,脆性层剪应力大于基底韧性层的剪应力,形成以前冲断裂为主的构造样式;而褶皱—冲断带的中段和前缘地区,脆性层的剪应力和基底韧性层的剪应力较为接近,形成后冲和对称性冲起构造为主。(3)构造地质体的变形速率很可能决定了其存在的物质状态。葡萄牙南部滨岸带的布丁构造和北美卡斯卡底古陆的纯后冲构造等特殊的构造样式极有可能是在差异的变形速率下形成。