枣庄市十里泉地下水环境问题的初步研究          下载免费PDF全文

曾宪同 《山东国土资源》1994,(1)

本文通过多年的监测资料，对十里泉水源地的过量开采和“三废”排放所引起的地下水环境问题进行了初步的探讨，并提出了治理和预防的措施。  相似文献   

湖北省荆江大堤沿堤地基土的分类特征     

胡坚  张柯  曾心传 《大地测量与地球动力学》1993,(4)

利用脉动测振方法对荆江大堤堤面沿线土层进行了实测研究,并对实测记录进行了傅氏谱分析。结果表明,沿堤土层绝大部分属于二类土地基,但有若干堤段土层属于由松散的粉、细砂所构成的三类土地基,且饱和程度非常高,有产生管涌和地震动液化的可能,应予特别注意。  相似文献   

新疆康古尔金矿硅同位素研究     

张连昌  曾章仁 《地球科学与环境学报》1994,(3)

本文通过对康古尔金矿含金石英脉、火山岩、侵入岩及沉积碎屑岩硅同位素组成进行研究比较，结合矿区地质探讨了含金石英脉硅质的来源。认为含金石英脉中的硅及与硅有关的金等成矿物质，主要来自火山岩和华力西晚期英云闪长岩。  相似文献   

Geology of Gold Ore Deposits in Western Linyi of Shandong Province,China     

Tiebing Liu  Qingdong Zeng  Yuanchao Shen  Guangming Li 《世界地质(英文版)》2003,6(1)

Western Linyi of Shandong Province is one of the most important gold ore mineralization concentration areas. Mesozoic gold ore deposits in this area can be subdivided into two types: magmatic hydrothermal and epithermal gold deposits. The occurrences of gold ore bodies are controlled by structures. Related subvolcanic rocks can be subdivided into high potassium calc-alkali series and alkaline series. These two types of subvolcanic rocks are of different geochemical features and different sources. The high potassium calc-alkali rocks are derived from enriched mantle and contribute to the formation of magmatic hydrothermal gold ore deposits including skarn gold-copper ore deposit and porphyry gold ore deposit. Alkaline rocks are derived from lower crust and they host epithermal gold deposits. Comprehensive studies show that there is no evolutionary or transitional relationship temporally and genetically between the epithermal gold deposit and the high temperature magma hydrothermal gold deposit in the western Linyi.  相似文献   

南海海域数种海藻总脂质及脂肪酸含量的比较     

黄俊辉  曾庆孝  佘纲哲 《广东海洋大学学报》2001,21(2):23-29

研究南海海域盛产的四种褐藻(海带、裙带菜、昆布和亨氏马尾藻)、三种红藻(紫菜、沙菜和江蓠)及来自南海三个不同海区(南沙、惠来和南澳)亨氏马尾藻的总脂质及脂肪酸含量干重,并重点比较其多不饱和脂肪酸的含量.结果表明,供试褐藻类海藻总脂质含量ω在1.81%～6.11%之间,红藻类海藻的总脂质含量ω在1.44%～3.96%之间;紫菜中含有7.548mg/g(干重,下同)的亚油酸(C182);海带含丰富C181,达5.592mg/g;花生四烯酸(C204)在裙带菜中含量为1.606mg/g;在供试藻种中,昆布的EPA(C20.5)和DHA(C226)含量最高,测定值为608μg/g和689μg/g.  相似文献   

肝癌与地形地貌类型关系初探     

曾昭华  曾雪萍 《南方国土资源》1997,(2)

文章利用地形地貌资料４５０２个数据，肝癌死亡调查资料８３４３例，研究了肝癌死亡率与人群生存的地形地貌类型的相关性。在此基础上综合评价了与肝癌有相关性的地形地貌类型对肝癌产生和发展的影响  相似文献   

锯缘青蟹Scylla serrata幼体形态观察     

曾朝曙  李少菁  曾辉 《广东海洋大学学报》2001,21(2):1-6

描述了锯缘青蟹各期幼体的外部形态.青蟹在环境条件不适、营养不良情况下,会出现异常的额外的第六期蚤状幼体.绘图表达了各期幼体重要特征.  相似文献   

我国某些历史地貌学问题的刍议   总被引：1，自引：0，他引：1  

曾昭璇 《地理研究》1983,2(2):12-19

本文提出历史地貌学是地貌学的一个组成部分,它主要研究人类历史时期地貌的变迁.它在理论上能对地貌学上一些基本理论给予证实或提供重要依据;在生产上能按历史演变过程提出一些建设性意见,为有关建设部门参考.并举珠江三角洲水道及黄河下游的整治意见为例.说明历史地貌学能对生产建设提供科学依据.  相似文献   

Prediction and verification of earthquakes induced by the Xiluodu hydropower station reservoir          下载免费PDF全文

Tinggai Chang  Baohua Li  Xinxiang Zeng 《地震科学（英文版）》2022,35(5):387-397

Research has been conducted on reservoir-induced earthquakes in China since the Xinfengjiang reservoir-induced earthquakes in the 1960s. Regulations now require the risk of reservoir-induced earthquakes to be evaluated in the pre-research stage of all hydropower projects. Although nearly 40 cases of reservoir-induced earthquakes have been reported in China, analyses comparing the changes in seismic activity following reservoir impoundment with predictions are rare. In this study, we compared seismic activities observed in the reservoir area before and after the impoundment of the Xiluodu hydropower station in terms of the spatial distribution, frequency, and focal depths of the earthquakes, and clarified the correlation between their frequency/timing and reservoir level after impoundment. We then concluded that the seismic events in the head region were karst-type earthquakes, while those in the second segment of the reservoir were tectonic earthquakes. The spatial distribution of the earthquake epicenters and the seismic intensities validated some of the results for the reservoir-induced seismic risk assessment for the Xiluodu hydropower station, indicating that the proposed earthquake triggers and predictive models are reasonable. This study can provide a valuable reference for investigating the mechanism (s) of reservoir-induced earthquakes, revising reservoir-induced earthquake hazard assessment codes, and predicting the hazard zones of reservoir-induced seismicity under similar conditions.  相似文献   

High-resolution structure-from-motion models covering 160 km-long surface ruptures of the 2021 MW 7.4 Madoi earthquake in northern Qinghai-Tibetan Plateau     

Jing Liu-Zeng  Wenqian Yao  Xiaoli Liu  Yanxiu Shao  Wenxin Wang  Longfei Han  Yan Wang  Xianyang Zeng  Jinyang Li  Zijun Wang  Zhijun Liu  Hongwei Tu 《地震研究进展（英文）》2022,2(2):100140

The 22 May 2021 M_W 7.4 Madoi, Qinghai, China earthquake presented a rare opportunity to apply the modern unmanned aerial vehicle (UAV) photography method in extreme altitude and weather conditions to image surface ruptures and near-field effects of earthquake-related surface deformations in the remote Tibet. High-resolution aerial photographs were acquired in the days immediately following the mainshock. The complex surface rupture patterns associated with this event were covered comprehensively at 3–6 cm resolution. This effort represents the first time that an earthquake rupture in the interior of the Qinghai-Tibetan Plateau has been fully and systematically captured by such high-resolution imagery, with an unprecedented level of detail, over its entire length. The dataset has proven valuable in documenting subtle and transient rupture features, such as the significant mole-tracks and opening fissures, which were ubiquitous coseismically but degraded during the subsequent summer storm season. Such high-quality imagery also helps to document with high fidelity the fractures of the surface rupture zone (supplements of this paper), the pattern related to how the faults ruptured to the ground surface, and the distribution of off-fault damage. In combination with other ground-based mapping efforts, the data will be analyzed in the following months to better understand the mechanics of earthquake rupture related to the fault zone rheology, rupture dynamics, and frictional properties along with the fault interface.  相似文献