班戈错Ⅱ湖晶间卤水蒸发硼浓度及硼同位素分馏研究          下载免费PDF全文

卿德林  马海州  李斌凯 《盐湖研究》2012,20(3):15-20

通过对采自西藏班戈错Ⅱ湖晶间卤水的模拟自然蒸发,发现在NaCl和KCl析出过程中,析盐矿物对硼具有较强的吸附作用,尤其是KCl。同时,伴随着NaCl和KCl的析出,硼同位素在液相和固相之间发生了明显的分馏。值得注意的是,在KCl析出过程中,固液相之间发生了硼同位素的反分馏现象,即11B倾向于进入KCl。  相似文献   

Confounding response of macrofauna from a confluence of impacts: brine and sewage pollution     

Rodrigo Rier  Fernando Tuy  Myriam Rodr&#;guez  &#;scar Monterroso  Eva Ramos 《海洋学报(英文版)》2013,32(10):74-81

Throughout the shores of the world,a confluence of different sources of pollution is common,e.g.,through outlets releasing brine,industrial,and domestic sewage.In this study,we assessed whether a combined disposal of domestic sewage and brine altered the patterns of abundance and assemblage structure of subtidal macrofauna inhabiting sandy seabeds on the south coast of Gran Canaria(Canary Islands,NE Atlantic Ocean).Samples were collected in two surveys(May 2008 and January 2009)at three distances(0,15,and30 m)away from the discharge point.Macrofaunal abundances showed different patterns with varying proximity from the disposal point in the two surveys.In May 2008,lower abundances were observed at0 m(53.89±46.82 ind.)than at 15 m(120±91.7 ind.)and 30 m(283.89±189.33 ind.)away from the disposal point.In January 2009,however,higher abundances were observed at 0 m(131.33±58.69 ind.)than at 30 m(100±24.44 ind.)and 15 m(84.78±58.39 ind.)away from the disposal point.Significant differences in macrofaunal assemblage structure were found with varying proximity from the discharge point in both surveys.The effect of proximity from the disposal point was confounded by changes in sedimentary composition between surveys,which contributed to explain differences in macrofaunal abundances and assemblage structure with varying proximity from the discharge point.As a result,confounding drivers of macrofaunal assemblage structure,here,changes in sediment composition,accounted for changes in macrofaunal abundances and assemblage structure with varying proximity from a combined disposal point of brine and sewage.  相似文献   

THE INDUCTION AND EXTRACTION OF METALLOTHIONEINS IN ARTEMIA     

陈炳良 《中国海洋湖沼学报》1994,(2)

A small amount of heavy metal binding protein,identified by BioRad Protein Assay,has been iso-lated from the adult brine shrimp,Artemia franciscanus.This protein has an apparent molecular weight be-tween 6000 to 9000 dalton.a UV absorption peak at 260 instead of 280 nm like most proteins;andhas high affinity towards binding with radioactive labeled ~(109)Cd.These characteristics are similarto that of metallothioneins reported for many vertebrate and invertebrate,marine and terrestrialanimals.After the brine shrimp is exposed to a small amount of Cd~(2+)for 24 h,a large amount ofmetallothionein can be isolated,showing the inducibility of this detoxifying protein in the adult Artemiain a short period of time.  相似文献   

浅议别勒滩首采区卤水化学成分变化趋势     

胡云峰 《青海国土经略》1993,(2)

为一份采卤试验的实际材料。结论为:试验前后卤水化学成分有一定变化,但阳、阴离子和化合物变化趋势并不明显。基于采期短,抽卤井影响范围小,可以预见3—5年内卤水成份无明显改变。随采卤时间延长,影响范围扩大,淡水补给,卤水化学成份将会明显降低。  相似文献   

Late Quaternary paleolimnology of Walker Lake,Nevada     

J. Platt Bradbury  R. M. Forester  R. S. Thompson 《Journal of Paleolimnology》1988,1(4):249-267

Diatoms, crustaceans, and pollen from sediment cores, in conjunction with dated shoreline tufas provide evidence for lake level and environmental fluctuations of Walker Lake in the late Quaternary. Large and rapid changes of lake chemistry and level apparently resulted from variations in the course and discharge of the Walker River. Paleolimnological evidence suggests that the basin contained a relatively deep and slightly saline to freshwater lake before ca. 30 000 years B.P. During the subsequent drawdown, the Walker River apparently shifted its course and flowed northward into the Carson Sink. As a result, Walker Lake shallowed and became saline. During the full glacial, cooler climates with more effective moisture supported a shallow brine lake in the basin even without the Walker River. As glacial climates waned after 15 000 years ago, Walker Lake became a playa. The Walker River returned to its basin 4700 years ago, filling it with fresh water in a few decades. Thereafter, salinity and depth increased as evaporation concentrated inflowing water, until by 3000 years ago Walker Lake was nearly 90 m deep, according to dated shoreline tufas. Lake levels fluctuated throughout this interval in response to variations in Sierra Nevada precipitation and local evaporation. A drought in the Sierras between 2400 and 2000 years ago reduced Walker Lake to a shallow, brine lake. Climate-controlled refilling of the lake beginning 2000 years ago required about one millennium to bring Walker lake near its historic level.Through time, lake basins in the complex Lake Lahontan system, fill and desiccate in response to climatic, tectonic and geomorphic events. Detailed, multidisciplinary paleolimnologic records from related subbasins are required to separate these processes before lake level history can be reliably used to interpret paleoclimatology.This is the fifth of a series of papers to be published by this journal that was presented in the paleolimnology sessions organized by R. B. Davis and H. Löffler for the XIIth Congress of the International Union for Quaternary Research (INQUA), which took place in Ottawa, Canada in August 1987. Drs. Davis and Löffler are serving as guest editors of this series.  相似文献   

Solubility of silica polymorphs in electrolyte solutions, II. Activity of aqueous silica and solid silica polymorphs in deep solutions from the sedimentary Paris Basin     

M. Azaroual  C. Fouillac  J. M. Matray 《Chemical Geology》1997,140(3-4):167-179

Activity coefficient for aqueous silica in saline waters and brines from the Paris Basin was calculated using Pitzer's specific interaction model. Quartz and chalcedony are the only reported authigenic silica minerals in the Dogger aquifer of the Paris Basin (France). However, the measured silica concentrations fall between those of these two phases. The silica concentrations measured in Dogger fluids seem to be controlled by a microcrystalline quartz phase with a grain size computed to be about 20 nm. Studies have shown that pressure can preserve small grain size for a long time at the geological scale. The effective mechanism of pressure action is probably linked to the fact that pressure simultaneously favours dissolution at the grain-contact inducing a quartz supersaturation and prohibits the increase in size of reprecipitated microcrystalline quartz grains. This hypothesis is supported by other studies reported in the literature. The proposed model, which incorporates silica mineralogy and a precise calculation of aqueous silica activity, allows us to explain measured silica concentrations in the deep sedimentary solutions of the Dogger aquifers. In the Keuper brines, silica solubility can in most cases be explained by an equilibrium with either chalcedony or quartz. Another application of the present work is shown by an example, where we examined the importance of precisely evaluating the activity coefficient in basin characterisation, as the goal of reservoir characterisation is to describe the spatial distribution of petrophysical parameters such as porosity, permeability, and saturations.  相似文献   

浏阳永和海泡石在海洋钻井泥浆中的应用   总被引：1，自引：0，他引：1  

杨光华 《湖南地质》1997,16(3):205-208,204

该文介绍浏阳县永和镇海泡石的物化基本分析结果及海泡石粘土加工方法试验、机械分散试验、分散介质试验、造浆性能评价方法以及在南海油田进行实钻试验的情况，认为用永和海泡石开发钻井泥浆材料在技术上是可行的，有着很大的远景市场开发潜力。  相似文献   

四川盆地气田卤水浓度及成因分类研究          下载免费PDF全文

林耀庭  潘尊仁 《盐湖研究》2001,9(3):1-7

四川盆地气田卤水分布广泛 ,自震旦系至白垩系各层系均有分布 ,然而其浓度及成因类型不尽一致。按其浓度可分高浓卤水、淡卤水和中浓卤水三类 ;成因类型依据氢、氧同位素地质学方法可划分为大气水渗入淋滤型、海源沉积型、海源沉积—大气降水叠加型和海源沉积—岩浆水叠加型四类。该分类明确 ,标志明显 ,应用效果良好  相似文献   

论四川盆地三叠系盐类热融水溶变质对找钾方向的控制   总被引：1，自引：4，他引：1       下载免费PDF全文

林耀庭  郑茂全 《盐湖研究》2002,10(1):8-17

四川盆地蕴藏丰富的盐卤资源。从盆地海相三叠系盐类大量的热融、水溶变质资料 ,阐述了它对盆地三叠系找钾方向的控制 ,提出开辟富钾卤水———液态钾矿的找钾工作 ,是四川盆地至为重要的找钾新方向  相似文献   

Silicalites of Hydrothermal Origin in the Lower Cambrian Black Rock Series of South China   总被引：7，自引：0，他引：7  

李胜荣  高振敏 《中国地球化学学报》1996,15(2):113-120

A silicalite bed was found in the hanging wall and foot wall of the sulfide-rich bed of the Lower Cambrian black rock series in South China.Its origin was not described before,On the oxide(SiO2-Al2O3,SiO2-MgO,SiO2-k2o Na2O)diagrams for discriminating silicalites of chemical,biological and volcanic origins(Liu Xiufeng,1991),most of the data points of silicalites fall within the areas representing silicalites of chemical and volcanic origins.On the Al-Fe-Mn diagram for discriminating silicalites of hydrothermal and biological origins(Yamamoto,1987),the data points fall within the areas representing silicalites of hydrotermal and hydrothermal-biological origins.On the SiO2-Al2O3 diagram for discriminating silicalites of hydrothermal and hydrogenous origins(Bonatti,1975),the data points mostly fall within the hydrothermal area.The ratios of SiO2/Al2O3,SiO2/(K2O Na2O),SiO2/MgO,and K2O/Na2O in the silicalites stand between those of volcanic sediments and of seafloor hydrothermal sediments.The total amount of rare-earth elements in the silicalites is low;the North american Shale-normalized REE patterns decline leftward with obvious negative Ce anomaly.The trace elements Mo,Zn,As,Sb,Se,U,and Ba are higher than those in non-hydrothermal sediments and U/Th≥1.The present authors think that the silicalites are derived from seafloor hot brines which had attracted elements from igneous rocks.  相似文献