Anthropogenic Sulfate and Nitrate Signals in Snow from Bogda Glacier, Eastern Tianshan     

张晓宇  Ross Edwards 《中国地质大学学报(英文版)》2011,(4)

A 1.2 m snow pit was recovered on July 29th, 2009 from the Bogda Glacier, eastern Tianshan (天山). The sample site temperature of -9.6 ℃ indicates that the unique glaciochemical re-cord was well preserved and suitable for the reconstruction of air pollution levels in this previously un-explored region. Samples were analyzed for major ions (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, SO42-, NO3-, HCOO-, and CH3COO-). NO3- and SO42- were characterized by significant high levels of pollution con-centration. Most air masses ...  相似文献   

Monitoring Glacial Shrinkage Using Remote Sensing and Site-Observation Method on Southern Slope of Kalik Mountain, Eastern Tian Shan, China     

王文彬  李开明  高建芳 《中国地质大学学报(英文版)》2011,(4)

Currently, one of the effective means in monitoring glacier change in regional scale is remote sensing and site-observation method. In this article, we present a study of comparing glacier area in 2005 derived from SPOT5 satellite image with area in 1972 derived from topographic maps. Moreover, Miaoergou (庙儿沟) flat-summit glacier is site observed to verify glacial change in regional scale. During the study period, glaciers located in the southern slope of Kalik (喀尔里克) Mountain re-duced their area by 12.3%. ...  相似文献   

Deposition Process of Dust Microparticles from Aerosol to Snow-Firn Pack on Glacier No. 1 in Eastern Tianshan Mountains, China     

尤晓妮  董志文 《中国地质大学学报(英文版)》2011,(4)

Samples were continuously collected from aerosol, fresh snow, and snow pits on Glacier No. 1 at Urumqi River source in eastern Tianshan (天山) Mountains. The deposition processes and the characteristics of mineral dust microparticles from aerosol to fresh snow, and then evolution to the snow pit were determined. Total dust microparticle concentration in the surface snow and aerosol showed a similar temporal variation trend, which was strongly associated with regional and local at-mospheric circulation in the ...  相似文献   

Noble Gas Diffusion Mechanism in Lunar Soil Simulant Grains:Results from ~4He~+ Implantation and Extraction Experiments     

付晓辉  邹永廖  郑永春  贺怀宇  欧阳自远 《中国地质大学学报(英文版)》2011,(5)

Experiments on ion implantation were performed in order to better characterize diffusion of noble gases in lunar soil.4He+ at 50 keV with 5×1016 ions/cm2 was implanted into lunar simulants and crystal ilmenite.Helium in the samples was released by stepwise heating experiments.Based on the data,we calculated the helium diffusion coefficient and activation energy.Lunar simulants display similar 4He release patterns in curve shape as lunar soil,but release temperatures are a little lower.This is probably a con...  相似文献   

Distribution of Arsenic in Sewage Irrigation Area of Pearl River Delta,China     

黄冠星  孙继朝  张英  荆继红  张玉玺  刘景涛 《中国地质大学学报(英文版)》2011,(3)

The aim of the present work is to investigate the distribution of arsenic(As) in sewage ir-rigation area,to deduce the migration and transformation mechanism of As in soil and groundwater,and to infer the source of As in soil and groundwater.This study is carried out in a sewage irrigation area of the Pearl River Delta,China.Surface water samples,soil samples,and groundwater samples from sewage irrigation area were analyzed for As and other elements.As contents in water samples were analyzed by hydride gene...  相似文献   

雪峰山基底隆升带及其邻区印支期陆内构造特征与成因   总被引：7，自引：0，他引：7  

李三忠  王涛  金宠  戴黎明  刘鑫  周小军  王岳军  张国伟 《吉林大学学报(地球科学版)》2011,41(1):93-105

狭义的华南陆块东部包括扬子地块和华夏地块,而雪峰山陆内构造系统是扬子地块的重要组成部分。通过对雪峰山地区印支期地层角度不整合时空分布规律的分析表明,高角度不整合—微角度不整合—平行不整合—整合的空间分布区域依次由东往西递变渐新。根据褶皱变形分析得出,雪峰山地区在印支期发育了北东东向和北北东向2个轴迹方向的褶皱,后期叠加了南北向弧形逆冲推覆构造。区域构造背景和动力学分析表明,扬子地块内部印支期总体北东向的变形形迹与东西轴向的秦岭—大别造山带和扬子地块南部东西轴向的构造线相垂直;其原因是:扬子地块与华夏地块最终陆内收缩变形的时间比扬子与华北沿秦岭—大别造山带的陆间碰撞拼合的时间早,印支早期的先存北北东向构造线在印支晚期由于扬子地块顺时针旋转变位为北东东向,从而决定了印支早期现今北东东向的构造线,随后的第二幕北北东向构造线的形成是在与早期第一幕变形的应力场相同的同一构造应力场作用下形成的。但是,秦岭—大别造山带近东西向的构造线取决于主动大陆边缘,即总体近东西向的华北陆块南缘边界,其原始方位为总体近东西向。这些复杂边界条件和旋转决定了先形成彼此近于垂直的构造线,然后拼接形成现今构造线垂直的格局。  相似文献   

滇东地区煤田构造格局与煤系赋存规律的研究   总被引：1，自引：0，他引：1  

陶志刚  曹代勇  李建  石显耀  林玉成  王坚 《中国煤炭地质》2011,(8):56-59

滇东地区位于特提斯和环太平洋构造体系的交接部位,煤田构造格局的总体特征是呈NNE向条带状展布。区内断层以NNE、NE向为主,受主要断裂影响,煤田在南北向呈带状,东西向呈段状展布,各煤矿区在平面上呈NE向带状分布。研究区煤系赋存受基底主干断裂的控制作用明显,变形强度由北向南逐渐增强,北部地区以褶皱构造为主,断层较少,煤层多保存于向斜构造中,保存较完整,煤层埋藏较深;南部受弥勒-师宗断裂带影响,断裂构造极为发育,对煤层破坏严重,煤系赋存不稳定。  相似文献   

广东连州长兴期含煤地层     

姚兆奇  陈楚震  芮琳  刘陆军 《地层学杂志》2011,(1):55-65

九陂组(亚田煤组)是粤北和湘南晚二叠世重要的含煤地层,其下伏"梅田灰岩"的涵义和(虫筵)化石Gallowayinella meitienensis的层位问题曾长期未得澄清.通过对梅田组剖面的详细工作,建立了下部的Gallowayinella组合和上部的Nanlingella jiaozishanica-Sphaerul...  相似文献   

最近11万年来东亚季风轨道与千年尺度气候变率在南京下蜀黄土中的记录     

张茂恒  孟景闻  夏应菲  赖忠平  汪永进 《地层学杂志》2011,(3):321-327

对南京李家岗下蜀黄土剖面上部的近20 m地层进行野外观察和室内研究,划分出5层黄土和5层古土壤,按5 cm间距采集了Rb/Sr、色度、磁化率和粒度样品,并在剖面和可追索的相邻剖面上采集了13个光释光测年样品。分析结果显示,Rb/Sr、色度和磁化率等夏季风代用指标曲线所表现的4次岁差变率振荡具有高度的一致性,依据气候地层...  相似文献   

青藏高原地面有效辐射变化及其对表层土温的影响   总被引：7，自引：6，他引：1  

李韧  赵林  丁永建  沈永平  季国良  刘广岳  杜二计  肖瑶  孙琳婵  刘杨  石伟 《冰川冻土》2011,33(5):1022-1032

利用青藏高原格尔木、狮泉河、昌都日射站及中国科学院冰冻圈观测研究站的观测资料,分析了高原有效辐射的变化,在此基础上结合土壤温度资料讨论了高原北部有效辐射的变化对表层土壤热状况的影响.结果显示：1）青藏高原有效辐射变化因所处的区域不同而异,高原东北部、西部及高原腹地有效辐射总体呈减小的趋势,高原东南部有效辐射呈增大的趋势...  相似文献