A study on benthic community structure in west of the Taiwan Strait and near the Taiwan Shoals     

Wu Qiquan  Jiang Jinxiang  Xu Huizhou  Cai Erxi  Lin Shuangdan 《海洋学报(英文版)》1995,14(2):235-245

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滇西地区地壳上地幔电性结构与地壳构造活动的关系   总被引：46，自引：3，他引：43       下载免费PDF全文

孙洁  徐常芳 《地震地质》1989,11(1):35-45

本文根据滇西地区18个大地电磁测深点资料的数据处理和分析结果,对测区深部导电率在纵、横向上的变化特征进行了研究。结果表明:滇西地区深部电性为多层结构,大致可分四至五个电性结构层;深部电性结构横向变化大,明显受区域构造控制;该区上部地壳内普遍存在低阻层;上地幔高导层明显存在两个隆起区,一个以剑川—鹤庆为中心呈北北西向展布的隆起区,另一个以腾冲—潞西为轴呈南北向展布的隆起区。 本文还讨论了地壳上地幔电性结构与大地构造的关系,滇西北裂陷区盆地的形成,以及该区地震活动与深部构造的关系  相似文献   

Decrepitation Thermometry and Compositions of Fluid Inclusions of the Damoqujia Gold Deposit,Jiaodong Gold Province,China:Implications for Metallogeny and Exploration   总被引：20，自引：0，他引：20  

Yang Liqiang  Deng Jun  Zhang Jing  Guo Chunying  Gao Bangfei  Gong Qingjie  Wang Qingfei  Jiang Shaoqing  Yu Haijun 《中国地质大学学报(英文版)》2008,19(4):378-390

The recently discovered Damoqujia (大磨曲家) gold deposit is a large shear zone-hosted gold deposit of disseminated sulphides located in the north of the Zhaoping (招平) fault zone, Jiaodong (胶东) gold province, China. In order to distinguish the temperature range of cluster inclusions from different mineralization stages and measure their compositions, 16 fluid inclusions and 5 isotopic geochemistry samples were collected for this study. Corresponding to different mineralization stages, the multirange peaks of quartz decrepitation temperature (250-270, 310-360 and 380-430℃(2) indicate that the activity of ore-forming fluids is characterized by multistage. The ore-forming fluids were predominantly of high-temperature fluid system (HTFS) by CO2-rich, and SO2-4-K type magmatic fluid during the early stage of mineralization and were subsequently affected by low-temperature fluid system (LTFS) of CH4-rich, and Cl--Na /Ca2 type meteoric fluid during the late stage of mineralization. Gold is transferred by Au-HS- complex in the HTFS, and Au-Cl- complex can be more important in the LTFS. The transition of fluids from deeper to shallow environments results in mixing between the HTFS and LTFS, which might be one of the most key reasons for gold precipitation and large-scale mineralization. The ore-forming fluids are characterized by high-temperature, strong-activity, and superimposed mineralization, so that there is a great probability of forming large and rich ore deposit in the Damoqujia gold deposit. The main bodies are preserved and extend toward deeper parts, thereby suggesting a great potential in future.  相似文献   

Guadalupian （Middle Permian） Conodont Faunas at Shangsi Section, Northeast Sichuan Province   总被引：1，自引：0，他引：1  

孙亚东  赖旭龙  江海水  罗根明  孙思  阎春波  PaulBWignall 《中国地质大学学报(英文版)》2008,19(5):451-460

This study recovered the Guadalupian conodont faunas from Shangsi (上寺) Section in Northeast Sichuan (四川). Four genera and nine species were identified, and three conodont zones were recognized and established; they include Jinogondolella nankingensis Zone, J. aserrata Zone, and J. postserrata Zone. The Roadian and Wordian boundary is set in the interval 5 m from the top of Bed 86 by the first appearance of the conodont J. aserrata. The Wordian and Capitanian boundary is set in the interval 2.3 m from the top of the Bed 95 by the first appearance of J. postserrata. Most of the specimens demonstrated low color alteration index (CAI) as 1.5-3, indicating that most part of the Maokou (茅口) Formation may have the suitable thermal conditions for the formation of oil source rocks.  相似文献   

南极国际GPS跟踪站的海潮位移改正 (英文)     

Youwen Liu  Weiping Jiang  Xiaohui Zhou 《地球空间信息科学学报》2008,11(2):148-151

This paper describes the ocean loading tides corrections of GPS stations in Antarctica, such as the Great Wall station and Zhongshan station. Based on the theory of ocean loading tides, the displacement corrections of ocean loading tides on GPS stations in Antarctica are calculated by using the CRS4.0 ocean loading tides model. These corrections are also applied to GPS data processing. The GPS data are analyzed by the GAMIT software with and without these corrections. We compared and analyzed the GPS baseline components to get the differences. The results show that the ocean tidal displacement corrections have obvious effects upon GPS baseline components. Therefore, we should not ignore the ocean loading tides corrections of GPS stations in Antarctica to obtain precise and reliable results.  相似文献   

垣曲盆地最高阶地风尘堆积形成时代及其构造意义   总被引：1，自引：1，他引：0       下载免费PDF全文

傅建利  王书兵  蒋复初  蔡遥 《第四纪研究》2008,28(5):841-853

对垣曲盆地原土坪阶地剖面进行了详细的沉积学和磁性地层学研究,结果表明,原土坪剖面地层自下而上由水下河湖相-漫滩相-风尘堆积构成,整个剖面记录了一个水位下降、由水下沉积环境转变为气下环境的连续堆积过程。剖面地层记录的1.84～1.62MaB.P.期间由河湖相沉积环境转变为典型风尘堆积的沉积转型及风尘堆积反映出的1.21MaB.P.前后古气候变化事件是对青藏高原青藏运动C幕和昆黄运动的区域沉积响应。开始于1.62MaB.P.的典型风尘堆积底界年龄代表了该级阶地的形成时代,表明该段黄河至少在此时已经形成。  相似文献   

末次盛冰期东亚气候的成因检测   总被引：4，自引：0，他引：4       下载免费PDF全文

姜大膀  梁潇云 《第四纪研究》2008,28(3):491-501

在国际古气候模拟比较计划设置的标准试验方案下,首先利用中国科学院大气物理研究所的全球大气环流模式（IAP-AGCM）模拟了末次盛冰期东亚气候状况,然后通过4组数值敏感性试验逐一模拟了大气CO₂浓度、海洋表面温度（SST）和海冰、陆地冰盖和地形、东亚植被变化4项强迫因子的单独气候效应,进而对末次盛冰期东亚气候的成因进行了检测。结果表明,末次盛冰期除华南局部略有升温外,中国年均地表气温显著降低,降温幅度总体上向北增大,青藏高原处存在一个降温中心。其中,SST和海冰变化是华南局部略偏暖的主因,它同时导致了东亚其他区域地表气温的显著降低,特别是在东北亚地区;陆地冰盖和地形变化对于东亚地表气温的显著冷却作用主要体现在东亚的西北部;大气CO₂浓度降低会引起东亚地区0.2～0.9℃的普遍降温;相对而言,东亚植被的降温作用（0.5～1.0℃）主要显现在中国40°N以南的区域。与此同时,SST和海冰变化能引起中国东部年均降水一定程度的减少,而大气CO₂浓度、陆地冰盖和地形、东亚植被单独变化均不会显著影响东亚年均降水的分布状况,然而,上述四项因子的共同变化会通过协同作用引起中国东部年均降水的显著减少,西部地区降水则与现在差别不大。此外,末次盛冰期东亚夏季风的显著减弱源于SST和海冰变化,冬季风变化则可归因于SST和海冰、陆地冰盖和地形的变化。  相似文献   

Study on the connectivity of heavy oil reservoirs by ultraviolet spectrum technique in the western part of the QHD32-6 oilfield     

Yaohui Xu  Dan Chen 《中国地球化学学报》2008,27(3):306-309

As a new method, the ultraviolet spectrum technique is applied to studying the connectivity of biode-gradable heavy oil reservoirs. The similarity of crude oils can be judged according to the extinction coefficient （E） because aromatic hydrocarbons and non-hydrocarbons have conjugated bonds and obvious absorption in the ultraviolet range, and different materials have different characteristics and additives. The relationship diagram is made in terms of the extinction coefficients （E） of the samples by taking E as the Y-axis and wavelength as the X-axis. The connectivity of oil reservoirs is estimated according to the curve positions and characteristic fingerprints of the sampies. The connectivity of part of the reservoirs in the western part of the QHD32-6 oilfield was studied with this method. The results showed that the connectivity of samples from wells F7 and F8 in the Nm-2 oil reservoir zone is good, that of samples from wells F17 and F20 in the Nm-1 oil reservoir zone also is good, and that of samples from wells F17, F19, and F20 is poor.  相似文献   

松辽平原区荒漠化形成与发展的地质基础   总被引：1，自引：0，他引：1  

赵福岳  路云阁  姜德仁  陈树旺  姜琦刚 《国土资源遥感》2008,19(3):90-93

利用卫星数据,结合实地地质调查、光释光（Optically Stimulated Luminecence, OSL）测年及孢粉数据,从地层、新构造和沉积环境等角度阐述了松辽平原晚更新世晚期湖积环境的形成与变化,提出了松辽平原晚更新世晚期湖积环境或湖积物质是区内荒漠化形成与发展的地质基础。  相似文献   

抗战内迁北碚的中央地质调查所与中国西部科学院          下载免费PDF全文

侯江 《江苏地质》2008,32(4):317-323

抗战时期,中央地质调查所内迁重庆北碚,中国西部科学院帮助其在纷乱的战时安定下来,开始相对稳定的科研工作,主要在西部地区开展调查、从事科研。地调所的科研血脉得以传承,成为战时国内矿产资源调查研究中心。  相似文献