苏北箕状断陷形成的动力学机制

苏北盆地由多个小型箕状盆地组成,过去一直用“拉线作用”和“裂谷盆地”理论解释其成因,但大量地震资料显示,新生界地层“楔状实体”的形成除沉积因素外,更主要的是因为多次不均衡抬升削蚀所造成,实际是一个早第三纪残留盆地。新生代构造现象既是中生代时期构造作用的延续,也是始新世以来复杂应力环境作用的结果。印支－燕山中期,中国东部只受到太平洋－库拉板块一种力源作用,地层形变强烈,受力方向单一,以NW,NWW向挤压或左行剪切为主,发育了大量逆冲推覆构造,始新世,由印度板块向欧亚大陆冲撞引发的NE向挤压力加入到本区,使苏北盆地从此处在因两大板块非均速推进而产生的二元交变动力环境：印度板块力源占主导时,产生“右旋扭动”力偶,使燕山早－中期逆断层复活反转的同时,由于中国西部大陆的不断抬升,本区总的以沉积作用为主,而太洋板块力源占主导时又产生“左行剪切挤压”,在整体抬升基础上,斜坡－凸起处的过多蚀进一步加强了箕状盆地结构。两种力源的时空交替实际形成了一个完整的“断－坳－隆”沉降－抬升构造旋回,利用裂变途径迹资料探讨了不同方向构的形成年代。     

青藏高原东北缘海原弧形构造区地壳电性结构探测研究

对青藏高原东北缘海原弧形构造区（105deg;～107deg;E，36deg;～37.5deg;N）的5条大地电磁测深剖面进行处理分析和二维反演，得到研究区内东西宽约160 km、深约60 km范围的地壳电性细结构. 结果表明: 研究区呈现南西——北东的带状分布特征. 由南西——北东可分为6个电性区块，依次为西吉盆地(Ⅰ)、西、 南华山隆起(Ⅱ)、兴仁堡-海原盆地(Ⅲ)、中卫-清水河盆地(Ⅳ)、中宁-红寺堡盆地(Ⅴ)和鄂尔多斯西缘带(Ⅵ). 各区块在平面上呈北西撒开、 南东收缩的ldquo;扫帚状rdquo;形态；弧形构造区弧顶附近构造完整、规模大，自弧顶向北西、南东两端构造规模逐渐减小. 地表到深度10 km左右，西、南华山隆起和鄂尔多斯西缘带呈高阻特性，西吉、兴仁堡-海原、中卫——清水河和中宁-红寺堡4个盆地的电阻率较低且呈盆地凹陷形状. 其中兴仁堡-海原盆地电性基底最深，显示为南西深北东浅的ldquo;簸箕状rdquo;起伏形态. 研究区发育不连续的壳内低阻带，与该区中、强震活动密切相关. 1920年海原大震区存在明显的电性结构差异，震区南西侧和上部区域为相对高阻，北东侧和下部区域为相对低阻.      

漫湾水库蓄水前后库区地震活动性与构造应力场分析

对漫湾水库蓄水诱发地震作了分析，结果表明，蓄水后库区小震频次明显增加，近距离地震明显增多，在蓄水首次达到高水位和由高水位突降至低水位时，诱发了最强地震。表明蓄水对库区构造应力场产生了影响，使得局部应力场较区域构造应力场作用方向出现明显偏转，作用方式发生改变，呈现较大的垂直作用效应，节面错动出现较大正倾滑动分量。     

利用哈佛CMT目录研究全球Ⅰ级构造系统的地震活动

地震是描述地壳现今构造带和应力场的最佳信息源,包含了全面而又丰富的动力学内涵。根据全球地震的分布及其运动学、动力学特征,全球最活动的构造被划分为环太平洋构造系、大洋中脊构造系和大陆构造系等 3个全球Ⅰ级构造系统。文中应用包含多种参数的哈佛CMT地震目录,研究了全球及其 3个Ⅰ级构造系统的地震震源破裂类型、地震活动特征、震源深度分布特征等,讨论了三大构造系在这些方面存在的差别,进而说明了各个构造系在构造环境和动力作用方面的差别     

Dominant factors in controlling marine gas pools in South China

In marine strata from Sinian to Middle Triassic in South China, there develop four sets of regional and six sets of local source rocks, and ten sets of reservoir rocks. The occurrence of four main formation periods in association with five main reconstruction periods, results in a secondary origin for the most marine gas pools in South China. To improve the understanding of marine gas pools in South China with severely deformed geological background, the dominant control factors are discussed in this paper. The fluid sources, including the gas cracked from crude oil, the gas dissolved in water, the gas of inorganic origin, hydrocarbons generated during the second phase, and the mixed pool fluid source, were the most significant control factors of the types and the development stage of pools. The period of the pool formation and the reconstruction controlled the pool evolution and the distribution on a regional scale. Owing to the multiple periods of the pool formation and the reconstruction, the distribution of marine gas pools was complex both in space and in time, and the gas in the pools is heterogeneous. Pool elements, such as preservation conditions, traps and migration paths, and reservoir rocks and facies, also served as important control factors to marine gas pools in South China. Especially, the preservation conditions played a key role in maintaining marine oil and gas accumulations on a regional or local scale. According to several dominant control factors of a pool, the pool-controlling model can be constructed. As an example, the pool-controlling model of Sinian gas pool in Weiyuan gas field in Sichuan basin was summed up.     

Subsidence history and forming mechanism of anomalous tectonic subsidence in the Bozhong depression, Bohaiwan basin

The Bozhong depression of the Bohaiwan basin belongs to a family of extensional basins in East China, but is quite different from other parts of the basin. The Cenozoic subsidence of the depression is controlled by a combination of lithospheric thinning and polycyclic strike-slip movements. Three episodic rifts have been identified, i.e. Paleocence-early Eocene, middle-late Eocene and Oligocene age. The depression underwent syn-rift and post-rift stages, but two episodic dextral movement events of the strike-slip faults modify the subsidence of the Bozhong depression since the Oligocene. The early dextral movement of the Tan-Lu fault associated with crustal extension resulted in accelerated subsidence during the time of deposition of the Dongying Formation with a maximum thickness of 4000 m. A late reactivation of dextral movement of the Tan-Lu fault began in late Miocene (about 12 Ma), which resulted in the intense subsidence of Minghuazhen Formation and Quaternary. In addition, dynamic mantle convection-driven topography also accelerated the post-rift anomalous subsidence since the Miocene (24.6 Ma). Our results indicate that the primary control on rapid subsidence both during the rift and post-rift stages in the Bozhong depression originates from a combination of multiple episodic crustal extension and polycyclic dextral movements of strike-slip faults, and dynamic topography.     

Zircon SHRIMP U-Pb ages and trace element geochemistry of the Kuhai gabbro and the Dur''''ngoi diorite in the southern east Kunlun tectonic belt, Qinghai, Western China and their geological implications

Timing of the intermediate-basic igneous rocks developed in the area of Kuhai-A'nyêmaqên along the southern east Kunlun tectonic belt is a controversial issue. This paper presents new zircon SHRIMP U-Pb dating data for igneous zircons from the Kuhai gabbro and the Dur'ngoi diorite in the Kuhai-A'nyemaqen tectonic belt, which are 555±9 Ma and 493±6 Ma, respectively. The trace element geochemical features of the Kuhai gabbro and the Dur'ngoi diorite are similar to those of ocean island basalts (OIB) and island arc basalts (IAB), respectively. Thus, the Kuhai gabbro with the age of 555±9 Ma and OIB geochemical features is similar to the Yushigou oceanic ophiolite in the North Qilian orogen, whereas the Dur'ngoi diorite with the age of 493±6 Ma and IAB geochemical features is similar to the island arc volcanic rocks developed in the north Qaidam. The Late Neoproterozoic to Early Ordovician ophiolite complex in the area of Kuhai-A'nyêmaqên suggests that the southern margin of the "Qilian-Qaidam-Kunlun" archipelagic ocean in this period was located in the southern east Kunlun tectonic belt. Therefore, the southern east Kunlun tectonic belt in the early Paleozoic is not comparable to the Mianlüe tectonic belt in the Qinling orogenic belt.     

土地房产基础地理信息系统建库中的质量控制探讨

在土地房产地理信息系统工程实践基础上，从空间数据的质量控制，属性数据的质量控制。空间数据之间的关系的质量控制以及空间数据与属性数据之间关联的质量控制等方面，探讨了土地房产基础地理信息系统数据采集和建库中有关质量控制问题，并提出了一些质量控制的方法和措施。     

高碳黑色页岩型铂族元素矿床性探讨

简析了高碳黑色页岩型铂族元素矿床（PGED）的研究现状，并根据矿床的特征初步将该类矿床划分为中层状黑色页岩，薄层状黑色页岩和高碳构造岩型3类；并从形成环境，成因等方面对PGED形成进行了剖析，强调了源区供给，有机迁移和热液叠加作用的差异是导臻形成不同类型黑色含碳页岩型铂族元素矿床的根源，指出了我国贵州－湖南高碳黑色页岩型铂族元素成矿性较差与层薄和叠加温度低有关。     

贵州地壳表层构造地球化学分区及其意义

根据贵州所处大地构造位置，在前人划分的扬子陆块、江南造山带和右江造山带构造单元的基础上，结合水系沉积物测量区域化探扫面成果，划分出四川盆地边缘SiO2-Na2O高背景地球化学区，黔北隆起F－CaO-MgO及亲基性元素高背景地球化学区，黔西断陷Au-As-Sb-Cu-Pb-Zn-Fe3O3亲硫元素及亲基性元素强聚集地球化学区，黔南台陷Cd-Hg-Sb-Ag-SiO2高背景地球化学区，江南造山带Ba-Ag-Al2O3－K2O-Na2O高背景地球化学区和右江造山带B－Au-Sb-SiO2高背景地球化学区等6个地球化学区。结合有关资料还在阐述各区地球化学特征的基础上，探讨了它们的科学意义。