Isotope composition of helium in eclogite from the Dabie Mountains, central China and its geological significance

Isotopic geochemical characteristics of helium in garnet and omphacite of eclogite in the Dabie Mountains are discussed. Concentrations of 3He and 4He in garnet and omphacite are 3.9×10 -14- 24.0×10 -14 and 0.48×10 -7-9.42×10 -7cm+3·g -1, respectively. Values of 3He/ 4He have a range of (1.19-4.63)×10 -7. Helium in the eclogite is derived from both mantle and crust. Isotopic geochemical data of helium indicate that eclogite in the Dabie Mountains might be formed in depleted mantle and the age of the cologite would be Indo-China epoch.     

氧同位素：追踪陆架海沿岸水团变化的良好标志

对于陆架海而言除了冰体积效应,温度效应外,还有由于大陆淡水注入引起的,使δ＾１８Ｏ值负向偏移的效应,而且在低海平面时期,当沿岸水团盛行时,这种效应起主导作用。笔者将这种效应从广州的盐度效应中分离出来,称为陆架海的负值效应。     

ICP-AES法快速测定葡萄酒中S、P、Fe

详细研究了ICP-AES法测定葡萄酒中S、P、Fe的各种条件.以S182.0nm,P177.4nm,Fe240.4nm为测定波长,葡萄酒经直接稀释5倍后可一次完成S、P、Fe的测定,方法简单快速.成功测定了几种葡萄酒中微量S、P、Fe,检出限分别为0.008mg/L、0.01mg/L、0.01mg/L,回收率为96.5%～108.5%.     

含硫化物废水在升流式填料塔中的处理及数学模拟

在升流式填料塔中,通过接种排硫硫杆菌形成稳定生物膜.在pH值和温度分别控制在 7. 0±0. 1和 30±2℃条件下,进水质量浓度分别为 85. 76, 177. 83, 269. 55和 394. 26mg/L时,改变硫化物容积负荷 (VLR)和溶解氧水平进行正交试验.研究和分析硫化物容积负荷与溶解氧共同作用下硫化物的去除规律、硫酸盐的生成规律以及单质硫的生成率,并对建立的模拟方程进行了验证.结果表明,在升流式生物填料塔内废水中的硫化物去除率能达到9500以上;应用模拟方程,对于不同的进水浓度,都能找到一个最佳的运行工况.在硫化物去除率和单质硫的生成率达到最佳时,保持反应器的最大容积负荷和最小的溶解氧.     

水合活化固硫装置脱硫效率试验研究

通过建立水合活化固硫试验装置，研究装置的工艺特性对装置脱硫率的影响规律．试验结果表明，各因子对脱硫率的影响程度由大到小依次是：水钙摩尔比、钙硫摩尔比、二氧化硫量、烟气入口温度和停留时间；在其他因子保持不变的前提下，装置的脱硫率分别随各单项因子的增加而有不同程度的提高．试验研究的结果验证了本文中探讨的水合活化固硫机理——反应发生在气、液、固三相之间，雾化水滴和吸收剂颗粒碰撞并在其表面形成液膜是固硫反应的前提．     

Pb isotopic geochemical study on the crustal structure of Tongbaishan

Pb isotopic composition of the Tongbai complex, distributed in the Tongbaishan to the west of the Dabieshan, ranges between the Dabie core complex and the Dabie ultral-high pressure (UHP) metamorphic complex, the latter having more radiogenic Pb isotopic composition than the former. Granites from the Jigongshan pluton, which intruded mainly into the Tongbai complex, are distinct from the Tongbai complex but similar to the Dabie core complex in Pb isotopic composition, showing that the magma of the Jigongshan granites was derived from the partial melting of the Dabie core complex. According to Pb isotopic compositional variation model in the vertical crustal section and magma source from the Jigongshan pluton, it is suggested that the Tongbai complex was an upper rock serial of the Dabie core complex, which is beneath the Dabie UHP metamorphic complex in the crustal structure of the Tongbai-Dabie orogenic belt. The Tongbai complex was not well preserved in the Dabie area due to the high exhumed crustal section. However, the crustal section in the Tongbai area was exhumed less than that in the Dabie area, and the deep crust in the Tongbai area still contains the basement composition similar to the Dabie core complex. Therefore, the crustal basements from the Dabie to Tongbai areas are united. The present distribution of the basement blocks in different locations of the Tongbai-Dabie orogenic belt reflects different exposure of the crustal section.     

Climatic significance of stable carbon isotope in tree rings of Abies spectabibis in southeastern Tibet

The annually cross-dated stable carbon isotope of tree-ring a-cellulose of Abies spectabibis collected from the southeastern Tibetan Plateau is used to examine its rela-tionship with climatic parameters. The residual D13C series in treerings is constructed after removing the effects of age trend and rising CO2. We found a close relationship between D13C in tree rings and the relative humidity of September—November of the previous year measured at the nearby Ny-ingchi Meteorological Station, albeit a strong 搇agged effect? Thus we developed a transfer function to reconstruct the autumn relative humidity for the Nyingchi region, which explained 37.9% of the total variance (p < 0.001). Our results suggest a high frequency and moderate amplitude variance of the relative humidity before 1800, and the variance re-versed afterwards.     

浙江天台大岭口银(金)铅锌矿床的成矿物质来源

浙江天台大岭口银（金）铅锌矿床是产于浙东中生代陆相火山岩中最具代表性的热液脉状矿床。文章根据区域矿床地质特征和成矿的物理化学条件，运用矿床稳定同位素和主要指示元素的地球化学，论证了成矿热液中介质水和金属元素的来源。     

川南古宋富安井田阳新灰岩岩溶水系及其铀同位素组成特征

在川南古宋煤田富安井田上二叠统龙潭煤系勘探过程中，发现其底板阳新灰岩内深部岩溶发育。文章根据电网络模拟及水化学资料，建立了阳新灰岩的岩溶水系及其结构，并通过岩溶水系铀含量及同位素（２３４Ｕ及２３８Ｕ）组成的研究，进一步为分析分支水系补给区、径流区及排泄、混合区的水文地质特征及地球化学环境提供了依据