四川“金土地工程”区农业地质调查评价的方法   总被引：2，自引：0，他引：2  

金立新李忠惠  刘应平贾小川陈德友  杨忠芳 《地质通报》2007,26(11):1413-1417

简要介绍了四川省地质调查院在"金土地工程"区开展农业地质调查评价试点研究项目的背景、目标任务、方法技术和提交的主要成果。通过试点研究,确定了该项工作的内容以土壤地球化学测量为主,地质、遥感等多种综合调查手段为辅的综合调查,其核心是土地质量的地球化学综合评估。  相似文献   

湖南洞庭湖地区土壤中Hg的来源   总被引：1，自引：0，他引：1  

张明杨忠芳  陈岳龙陈国光 刘红樱 《地质通报》2007,26(11):1463-1469

Hg污染已成为全球性的环境问题,尤其是Hg对土壤的污染,因其具有隐蔽性、不可逆性和长期性的特点,对陆生生态系统构成潜在的巨大威胁,因此查明土壤中Hg的来源非常重要。运用生态地球化学填图的指导思想,对湖南洞庭湖地区土壤剖面分析和成土过程研究后发现,表层土壤中Hg含量的高低与成土母质中Hg的含量有很好的对应性,成土过程对土壤中Hg的含量也有显著的影响。  相似文献   

辽宁省抚顺地下煤层气开发初步浅析     

吕相权  史殿友  赵富有 《吉林地质》2007,26(2):32-36

通过对抚顺市地下煤层、煤质及赋气状态、储气构造的分析,确定了保护城市,开发煤层气资源的经济空间。  相似文献   

吉林省某锑矿分离砷的研究   总被引：1，自引：0，他引：1  

宋发兴  万飞  赵向前  刘晓菊 《吉林地质》2007,26(3):78-83

采用以水玻璃、硫酸为主的组合抑制剂,浮砷抑锑。较好地解决了砷锑分离的难题,使锑的精矿含砷降到符合国家质量标准。  相似文献   

东南极普里兹带高级变质作用演化   总被引：4，自引：0，他引：4  

刘晓春  赵越  刘小汉  胡健民  徐刚 《地学前缘》2007,14(1):56-63

东南极普里兹带是经历泛非期高级变质和强烈变形的造山带,其内发现有经历格林维尔期高级变质事件的残块。格林维尔期变质矿物组合局部见于姐妹岛和赖于尔群岛,其高峰变质条件达到>950℃和>0.95GPa。泛非期高级变质作用是区域性的,其高峰变质并不像前人想象的那样只发生在中低压麻粒岩相条件下,而是高达850~950℃和0.90~0.95GPa。这些岩石随后经历了近等温减压过程,在760~860℃和0.55~0.70GPa的条件下达到了重新平衡,并进一步减压或近等压冷却至450~750℃和0.30~0.50GPa。同造山的紫苏花岗岩在减压伸展阶段侵位于格罗夫山地区的变质杂岩中,而晚-后造山的A型花岗岩、伟晶岩和花岗岩脉则遍布于整个普里兹带,从而构成一个完整的造山演化序列。由此可见,现有研究资料支持普里兹带是一条冈瓦纳超大陆在泛非期拼合的碰撞造山带的认识。  相似文献   

打桩振动对周围环境的影响     

黄同林 《福建地质》2007,26(1):52-56

在城市建筑物密集区进行振动沉管施工,引起震动对周围环境的影响已成为地基处理施工中一个突出的问题,通过对某项工程水泥粉煤灰碎石柱(CFG)桩施工振动对周边建筑物影响的测试和分析,对地基处理方法的选型及如何有效减轻和控制施工振动对周围环境的影响,均具有一定意义。  相似文献   

Mesoproterozoic Earthquake Events and Breakup of the Sino-Korean Plate   总被引：3，自引：0，他引：3       下载免费PDF全文

QIAO Xiufu GAO Linzhi PENG Yang 《《地质学报》英文版》2007,81(3):385-397

In the Mesoproterozoic time, the northern part of the Sino-Korean Plate experienced a period of intensive tectonic extension and breakup. 1. An abundance of sedimentary earthquake records is preserved in the Chuanlinggou, Tuanshanzi and Gaoyuzhuang formations in the Mesoproterozoic Changcheng System （1800-1400 Ma） and in the Mesoproterozoic Wumishan Formation of the Jixian System （1400-1000 Ma）. These earthquake records are characterized by various liquefied sand-veins, carbonate microspar and coarser spar veins, limestone dikes, liquefied breccia and various forms of liquefied contorted bedding. This deformation is always associated with synsedimentary faults and igneous activity. 2. Three liquefaction models for soft carbonate sediments are recognized, including liquefaction in laminated carbonate rocks, liquefaction in thin-bedded carbonates and large-scale liquefaction along huge carbonate dikes. 3. Based on the record of earthquake and volcanic activities, the Sino-Korean Plate experienced at least twice intraplate breakups. One occurred between 1800-1400 Ma, and the other occurred at about 1200 Ma. The last breakup resulted in formation of the Yan-Liao aulacogen, a tectonic zone characterized by deeper material vibrancy, active faults, major igneous activity and frequent earthquakes.  相似文献   

Statistical features of aftershock distribution size for moderate and large earthquakes in Chinese mainland   总被引：1，自引：0，他引：1  

蒋海昆郑建常  吴琼曲延军  李永莉代磊 《地震学报(英文版)》2007,20(2):158-169

Based on data of earthquake sequences with MS≥5.0 in Chinese mainland from 1970 to 2004,for different se-quence types and different rupture modes of the main shock,the relationship between aftershock distribution size Rand the magnitude of the main shock M0 has been studied statistically.Considering the rupture mode of the mainshock,we give the quantitative statistical relationships between R and M0 under 95%confidence level for differentsequence types.Qualitatively,lgR,the logarithm of the aftershock distribution size,is positively correlative to theM0,but the data distribution is dispersed.Viewing from different sequence types,the correlation between R and M0is very weak for isolated earthquake type(IET)sequence,R distributes in the range from 5 to 60 km;For main-shock-aftershock type(MAT),lgR is positively correlative to M0;For multiple main shock type(MMT),the core-lation between lgR and M0 is not very obvious when M0≤6.2 and R distributes in the range from 5 to 70 km,whileit shows a linear correlation when M0≥6.3.The statistical results also show that the occupational ratios of differentsequence types for strike-slip and oblique slip are almost the same.But for dip-slip(mostly are thrust mechanisms),the ratio of MAT is higher than that of IET and MMT.Comparing with previous results,it indicates that,when M0is large enough,R is mainly determined by M0 and there is almost no relationship with the rupture mode of themain shock.  相似文献   

不同规格化的引潮位展开及其转换          下载免费PDF全文

郗钦文 《地球物理学报》2007,50(1):111-114

引入完全规格化的缔合勒让德函数，阐述国际上两类不同规格化的引潮位展开，使引潮位函数表达更加简明，大地系数定义更加规范. 由此得到由Doodson规格化与Hartmann & Wenzel规格化之间的转换系数.  相似文献   

再论纬向正常密度假说与内波假说的比较   总被引：1，自引：0，他引：1  

郝晓光  方剑  柳林涛  刘根友 《地球物理学进展》2007,22(1):312-316

本文对“纬向正常密度假说”和“内波假说”再次进行了讨论，进一步比较了二者的联系和区别.根据岩石圈板块概念和地幔对流假说的基本观点、以及“纬向正常密度假说”和“板块运动重力机制”的基本观点，提出了“软流圈板块”概念.  相似文献