Is China Over-Populated?     

O.W.TU 《地理学报(英文版)》1935,(1)

The object of this paper is to show that the general poverty of the Chinese people is not caused by over-population, but by the primitive methods of production, the existing system of exploitation, the political chaos and the political and  相似文献   

Is China Over-Populated?     

O.W.TU 《地理学报》1935,(1)

The object of this paper is to show that the general poverty of the Chinese people is not caused by over-population, but by the primitive methods of production, the existing system of exploitation, the political chaos and the political and  相似文献   

西印度构造演化及其对烃类显示意义综述     

Andrew  M.  Gombos  William  G.  Powell  Ian  O.  Norton  万玲 《海洋地质》2009,(4):43-51

印度最大的油气聚集区位于西印度，具有独特的构造事件集中发生。中生代沿元古代活动带构造方向的裂谷作用形成了印度海岸的被动边缘盆地。Campanian期（83．5—70．6Ma），马达加斯加与印度发生分离，南北向正断层传播进入到Cambay Graben地区。在初始德干Reunion热点之上，晚Maastrichtian（70．6—65．5Ma）隆起在西北印度海岸产生了伸展应力场，形成盂买高断块。早古新世，德干溢流玄武岩喷发后，伸展在薄弱的地壳中继续，引起了孟买地堑和Surat坳陷沉降的加强、Seychelles微大陆从印度分离以及孟买高地上正断层的重新活动。孟买地堑和Surat（Danahu）坳陷在热沉降期间充填了富有机质页岩，在缓慢沉降的盂买台地上发育了始新-中新世浅水碳酸盐，海平面波动产生了次生孔隙的发育。晚第三纪成熟的Surat（Danahu）坳陷页岩生成烃类，运移至孟买高的碳酸盐储层。Canlpanian构造事件之后，Konkan—kerala和印度东海岸的较老盆地并未受到影响，缺乏有利的成藏要素是该地区的特点。  相似文献   

Causes of rockfalls in Al-Huwayshah area,Yemen     

Aref M.O.AL-JABALI  Abdo S.AL-MAQTARY  Hussein AL-AKHALI  Mohammed HAZAEA  Fadel AL-AGHBARI 《东北亚地学研究》2009,(1)

According to topography of Yemen,most areas and villages are located at obligated crest,toe of mountain and under cliffs.Therefore Al-Huwayshah consisting of Tawilah sandstone group is characterized by steep slope reach to 90° in some areas.This area is affected by strong tectonic movements and faults that occurred during the geological epochs.This effect enhances to find out fractures and joints as well as the rocks become brittle and ready to slide depending on the position of area.And there are some frac...  相似文献   

Towards an operational use of space imagery for oil pollution monitoring in the Mediterranean basin: a demonstration in the Adriatic Sea     

Ferraro G  Bernardini A  David M  Meyer-Roux S  Muellenhoff O  Perkovic M  Tarchi D  Topouzelis K 《Marine pollution bulletin》2007,54(4):403-422

Studies of operational pollution carried out by European commission - Joint Research Centre in the Mediterranean Sea for the years 1999-2004 are briefly introduced. The specific analysis of the Adriatic Sea for the same period demonstrates that this area has been characterized by a relevant number of illegal discharges from ships. After setting the historical background of the project AESOP (aerial and satellite surveillance of operational pollution in the Adriatic Sea), the content, partners and aim of the project are presented. Finally, the results of the first phase of the AESOP project are presented. The results seem very encouraging. For the first time in the Adriatic, real time detection of oil spills in satellite images and an immediate verification by the Coast Guard has been undertaken. An exploratory activity has also been carried out in collaboration with the University of Ljubljana to use automatic information system (AIS) to identify the ships detected in the satellite images.  相似文献   

内蒙古集宁新生代玄武岩中橄榄岩包体矿物化学特征及其地幔演化意义   总被引：1，自引：0，他引：1  

周媛婷  郑建平  余淳梅  陈曦  张明民 《岩石矿物学杂志》2010,29(3):243-257

在无水"干"体系的四矿物相橄榄岩中,单斜辉石由于熔点低而通常记录着丰富的部分熔融作用和地幔交代作用信息。在详细岩相学特征和组成矿物主元素分析基础上,重点对内蒙古集宁玄武岩中橄榄岩包体的单斜辉石进行了激光原位微量元素研究。通过与新生代时华北具古老克拉通地幔特征(如鹤壁)和具新生岩石圈地幔特征(如山旺)的橄榄岩对比,讨论了新生代时集宁地区陆下岩石圈地幔性质及其形成和演化机制。集宁地区岩石圈地幔是相当于原始地幔经过较低程度的部分熔融抽取形成的,除个别样品的部分熔融程度5%外,多数样品为5%～10%。橄榄岩的平衡温度与橄榄石Mg#关系表明新生代时集宁地区的陆下岩石圈地幔是不均一的,无明显分层现象,表现为饱满与过渡型地幔的共存。这种主体饱满并兼有过渡型地幔的不均一现象,可能是软流圈物质对古老地幔进行不均匀侵蚀、改造和置换作用的结果。  相似文献   

A new species of extinct genus Lycopodites from Lower to Middle Jurassic sediments of Irkutsk coal basin （Eastern Siberia）   总被引：1，自引：0，他引：1  

Andrei  O.  Frolov Irina  M.  Mashchuk 《东北亚地学研究》2014,(1):1-10

  相似文献   

Analysis of petroleum hydrocarbons in mangrove sediments of Red Sea of Yemen     

Nabil A. AL-SHWAFI  Abdulhakim AL-KHOLIDI  Aref M. O. AL-JABALI 《东北亚地学研究》2009,(3):160-163

A field work has been carried out to identify the occurrence of oil and oil products pollution in mangrove sediment from Red Sea of Yemen. The concentration of total petroleum hydrocarbons is from 700ng/g at Kamaran Island station to 400 ng/g at Al-Hodiedah station, and the total organic carbon （TOC） in samples ranges from 0. 07% at Dhubab station to 0. 03% at Kamaran Island station. This pollution is as a result of localized oil pollution and/or heavy ship traffic in the Red Sea and Gulf of Aden.  相似文献   

Lead contamination of small cetaceans in European waters--the use of stable isotopes for identifying the sources of lead exposure     

Caurant F  Aubail A  Lahaye V  Van Canneyt O  Rogan E  López A  Addink M  Churlaud C  Robert M  Bustamante P 《Marine environmental research》2006,62(2):131-148

Lead concentrations and isotopic composition have been measured in bone and teeth of small cetaceans belonging to three species (Delphinus delphis, Phocoena phocoena and Stenella coeruleoalba), to evaluate the toxicological risk and to determine sources of lead in the European waters. Lead concentrations, far lower than threshold value inducing toxic effects in human, were higher in teeth than in bones, but highly correlated between the two tissues (r=0.92, p<0.001). Large variations of 206Pb/207Pb values in bone tissue showed that cetaceans must be submitted to various atmospheric influences. No geographical differences appeared which is consistent with studies on their distribution indicating seasonal movements between Brittany waters and the Bay of Biscay. The negative correlation between 206Pb/207Pb ratios and age of the individuals reflected the decrease in the production of alkyl lead in Europe, i.e., the increasing use of unleaded gasoline.  相似文献   

日本的碘—地质学与地球化学     

FuKut  O  曹正芳 《盐湖研究》1989,(3):49-54

  相似文献