分层重力图像方法及其应用

分层重力图像方法是依据三维地震波速的层析成像结果，通过速度与密度相关关系，转换得到分层的密度结构模型，计算并给出各分层在地表的重力异常分布图像．以中国大陆为例，给出其不同深度的7个分层的重力异常图像和不同分层叠加的综合（或总合）重力异常分布图像．经过与实测的中国布格重力异常资料对比分析，结果表明两者的重力场特征相当一致；分层重力图像的结果能较好地反映地下不同深度的物质分布．     

大地电磁二维对称各向异性介质的有限元数值模拟

假定垂直轴为二维对称各向异性介质主轴之一，构造走向与另一主轴方向成任一夹角，用伽勒金（Ｇａｌｅｒｋｉｎ）有限元法和矩形网格，优化地合成总体刚度矩阵，使二维各向异性介质的基本方程形成有限元代数方程组，求出各节点场值，并利用ＭＯＭ法求出辅助场，进而求出张量阻抗等响应函数．同时还对有关文献的计算模型进行了数值模拟检验     

应用灰色系统理论进行地震灾害等级划分和灾情分析比较

通过对地震时人员死亡、受伤、房屋破坏和直接经济损失４个灾害损失指标的函数转换，使得用不同的损失指标判别灾害等级的标准取得了统一．然后，应用灰色聚类方法划分地震灾害等级，并用灰色关联度排序方法对不同的灾情进行分析比较．同时还对１９６６～１９８３年我国大陆７次重要地震和１９９５年我国大陆１７次地震进行了灾害等级划分和不同灾情的分析比较．结果表明，该方法基本可定量准确地评价地震灾情     

山西地堑系的最新水平运动

利用山西断裂带布设的GPS监测网的6期复测资料(1996—2001),分析了山西断陷带的水平运动特征。结果表明,整体呈现逆时针的差异活动,主压应力场的方位角为72°,断裂两侧不存在明显的走滑运动。2001年的运动显示,代县附近是差异活动的分界区段。     

利用GPS资料浅析华北地区块体运动及与地震活动的关系

为了研究华北地区近年地壳水平运动的状态与演化．利用10a来华北地区网络工程、山西断裂带GPS观测成果．结合该区地质构造背景．分析了华北地区各块体运动的方向、速率变化及其与区内所发生地震的关系．初步得出以下结论：在区域应力场相对稳定时，表现为区域内GPS观测点整体趋势性运动不明显；而在区域应力场相对变化时．表现为影响区域内GPS观测点出现明显的整体趋势性运动。     

川陕丁家林金矿区探矿权的评估

为准确、客观估价丁家林金矿区探矿权价值，根据矿区地质报告中提交的储量级别、矿体控制程度和工程质量，确定了基础和可采储量、生产规模、矿山服务年限、贴现率、有关实物工作量等6项参数。综合运用贴现现金流量和重置成本法对探矿权进行评估，对达到详查程度的基础储量采用贴现现金流量法，控制程度低的资源量采用重置成本法，二者之和综合反映探矿权的价值。此方法适用于地质工作程度不均衡矿区的探矿权评估，贴现现金流量法要充分考虑储量的可信度和获利临界品位．重置成本法关键是准确确定有关的实物工作量。     

Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone, South Qinling

The Sanchazi mafic-ultramafic complex in Mianlue tectonic zone, South Qinling can be subdivided into two blocks, i.e. Sanchazi paleo-magmatic arc and Zhuangkegou paleo-oceanic crust fragment (ophiolite). The Sanchazi paleo-magmatic arc is mainly composed of andesite, basaltic and basalt-andesitic gabbro (or diorite), andesitic dyke, plagiogranite and minor ultramafic rocks, which have typical geochemical features of island arc volcanic rocks, such as high field strength element (e.g. Nb, Ti) depletions and lower Cr, Ni contents. The Light rare earth element (LREE) and K enrichments of these rocks and zircon xenocrystals of 900 Ma from plagiogranite suggest that this magmatic arc was developed on the South active continental margin of the South Qinling micro-continent. The U-Pb age of (300 ± 61)Ma for zircons from plagiogranite indicates that the Mianlue paleo-oceanic crust was probably subducted underneath the South Qinling micro-continent in Carboniferous. This is consistent with the formation time (309Ma) of the Huwan eclogite originating from oceanic subduction in Dabie Mountains, suggesting that the Mianlue paleo-ocean probably extended eastward to the Dabie Mountains in Carboniferous. The high-Mg adakitic rocks in Sanchazi paleo-magmatic arc suggest that the subducted oceanic crust was relatively young (＜25Ma) and hot.     

A new method for testing pile by sin- gle-impact energy and P-S curve

Introduction Through many year's practices by vast numbers of scientific and technological workers andefforts from all aspects, the dynamic testing method of high-low strain has formally entered intothe technical code of foundation pile test of construction at last (The Industry Standards of thePeople's Republic of China, 2003). The striking mode of the dynamic testing method of high strainis stipulated as hammer in the code, the striking of rocket can also be used. The latter is widely…     

Electron microscopy study of the sakhaite from endogenous borate deposit in Hunan, China

Sakhaite was first discovered by Ostrovskaya, Pertsev and Nikitina at Siberia in the former Soviet Union. By using the X-ray diffraction technique, they proved that the crystal system of sakhaite was cubic (a = 1.464 nm), its possible space groups were Fm3m, F432, F43m, Fm3, F23, and its crystal chemical for-mula was Ca48Mg16(CO3)16(BO3)28Cl4(OH)8 4H2O[1]. Chichagov, Simonov and Belov studied the crystal structure of synthetic sakhaite and determined that its space group was F4132, …     

Development characteristics of interlayer oxidation zone type of sandstone uranium deposits in the southwestern Turfan-Hami basin

The known uranium ore and anomaly occur-rences are distributed mainly in the southwestern part of the Turfan-Hami basin. The focus of current explo-ration is placed on the leachable interlayered oxidation zone type of sandstone uranium deposits. Uranium deposits in the sedimentary basin can be classified into three types in accordance with their host rock types, i.e. the sandstone-type uranium deposits, the coal rock-type uranium deposits and the mud-stone-type uranium deposits. The sandstone…