Variation in chlorophylla concentrations and Margalef’s index of pigment diversity in two solar salt ponds,Aveiro, Portugal

Variations of chlorophylla and Margalef's pigment diversity index were studied in two solar salt ponds at Aveiro (Esmolas and Tanoeiras). Portugal. In the Esmolas ponds, mean chlorophyll a values varied between 2.49 and 13.33 mg m⁻³ in the non-growing season, and between 5.43 and 40.55 mg m⁻³ in the growing season. In the Tanoeiras ponds, mean chlorophylla values were between 8.12 and 14.85 mg m⁻³ in the non-growing season, and 8.65 and 21.19 mg m⁻³ in the growing season. Fluctuations of Margalef's pigment diversity index were more irregular.     

察尔汗盐湖盐系地层中的风积物

通过对青海察尔汗盐湖盐系地层中碎屑物的研究,发现有风积物存在。风积物的大量出现一般代表着湖水相对浓缩。盐系地层中光卤石层位于碎屑层之上及其超覆现象和“珍珠盐”的形成均与风的作用有密切关系。这对于盐湖地质理论研究及开展我国的找钾工作有一定意义。     

三江平原沼泽湿地区道路冻害

三江平原沼泽湿地区,在自然和人为影响下,发育着五种不同类型的道路翻浆,某些路段产生雪阻,冰糊(涎流冰)、路面挂冰等道路冻害,严重影响交通运输,采取相应防治措施维持运营。     

The Evolution of the Quaternary Salt Lakes in the Qaidam Basin

The paper discusses the distribution of Quaternary sediments, occurrence of saline minerals and phases of neotectonic movements and their manifestations in the Qaidam basin. The formation of four successive lacustrine terraces in Tertiary anticlinal zones in the western part of the basin was related to the neotectonic movements that took place 100 Ka ago, and the distribution of such terraces discloses, in a way. the evolutionary history of the Quaternary salt lakes. According to the distribution of the terraces coupled with the distribution of Quaternary sediments and features of salt deposition, four periods of Quaternary salt lake evolution in the basin may be distinguished, which correspond to four stages of salt deposition respectively.     

自贡地区棋盘格式构造及其对T_1j~（4－4）成盐作用的控制

自贡地区Ｔ_１ｊ~（４－４）（下三叠统嘉陵江组第四段四层）岩盐体，受控于Ⅲ级棋盘格式“Ｘ”扭断裂之交叉处。据此预测的岩盐体与剖面岩相法预测的岩盐体有惊人的一致性，并陆续被钻井证实。在１２０ｋｍ~２内，已有１００余口井证实在“ｘ”交叉处１ｋｍ~２之外，均无岩盐体存在。“Ｘ”交叉处在ＴＭ遥感图象上几乎都有环形影象的反映，个别已证实为岩盐体引起。棋盘格式构造找矿模式已超出找岩盐的本身，它为重新认识找钾盐和其它矿产开拓了新思路。丰富了地质力学的内容。     

第四纪察尔汗地区石盐沉积中的氯同位素组成

采用基于Ｃｓ２Ｃｌ＋离子的正热电离质谱高精度测定氯同位素方法（在９５％的置信水平时，测定精度为０．０２％），测定了柴达木盆地察尔汗盐湖ＺＫ─８９０４钻孔原生石盐和次生石盐中氯同位素组成．研究表明五万年以来察尔汗地区氯同位素组成δ３７Ｃｌ的变化范围为－１．１５７～－０．３７９‰（ＳＭＯＣ）．根据氯同位素，组成的变化规律并结合ＺＫ─８９０４钻孔中氢氧同位素组成，推断出在此期间察尔汗盐湖至少经历了三次较大规模的淡化，冰后期和增温干旱期的两次湖水淡化对现代盐湖的形成起到了重要的作用，同时也复证了该地区的古气候演化模式。     

马海盐湖区卤水和盐类矿物的氯同位素特征及意义

采用以Ｃｓ２Ｃｌ＋为发射离子的高精度正热电离质谱方法，对柴达木盆地马海盐湖区卤水和共存的盐类沉积、河水、钻孔盐类沉积中的氯同位素组成进行了精确的测定．该地区盐湖卤水氯同位素组成表明，在相同的蒸发沉积环境地质条件下，地表卤水δ３７Ｃｌ变化范围为－１．５５‰到０．５３‰。盐类沉积垂直剖面的δ３７Ｃｌ值变化范围在０．００‰。到１．０５‰。在此基础上，初步研究了利用卤水及盐类矿物氯同位素组成变化追踪盐湖补给水来源及盐湖古气候变化．     

蒙新高原盐湖盆地环境的变迁形式

通过蒙新高原典型盐湖区的解剖研究，查清了代表性盐湖盆地的相环境及其沉积建造，将盐湖盆地环境的变化形式划分为沉陷型、抬升型和改造型，并归纳了盐湖盆地相环境分异与盆地地质构造之间的关系，为开发大陆干旱区主地的盐湖和卤水资源及其环境演化的理论提供了依据．     

Seasonal changes in surface level of a salt marsh creek

Nineteen surveys were carried out over a two-year period to determine the surface height of a salt marsh creek located on the north side of the River Esk, Cumbria, England. An AGA 112 electromagnetic distance measurer mounted on a Wild TI theodolite was used in conjunction with acrylic reflectors to follow the form of the ground. The results showed that there were no significant net trends in surface level, although seasonal variations of the order of 2 cm occurred. Vegetated areas responded in similar fashion to bare surfaces. It is thought that the elevational changes were attributable to the swelling of clay particles during the winter months rather than the effects of erosion and accretion.     

Application of performance data from evaporite mines to salt nuclear waste repository design

Summary Data on the performance of operating mines in rock salt and potash from United States and British sources is reviewed. A design validation scheme for nuclear waste repositories is proposed, based on back analysis of the response of operating evaporite mines.