广西河池五圩矿田构造应力场划分及力源探讨     

章程 《南方国土资源》2000,13(2):7-10

五圩矿田位于广西南丹-河池锡多金属成矿带的南端,主干构造为NNW向的不对称短轴背斜,其上叠加了NE、SN、EW 3个方向的褶皱,它们在丹池带上都有表现.文章通过大量共轭节理、层面擦痕、断层派生小构造、次级褶皱等构造要素野外观测,室内计算,恢复了五圩矿田中生代(印支-燕山期) 4期构造应力场,各期主压应力方位依次为NEE、NW-SE、N WW-SEE及NNE向,前两期为印支期,后两期为燕山期.并探讨了其力源:印支期来源于古特提斯板块向北俯冲与江南古陆向南推移形成的SN向顺时针区域力偶;燕山期来源于丹池断裂的右旋或左旋走滑活动.  相似文献   

顾及起算数据误差的附加基准平差   总被引：4，自引：3，他引：1  

王穗辉 《大地测量与地球动力学》2005,25(1):72-75

在独立网附加基准法平差基础上,讨论了起算数据有误差时的处理方法．并对用这种方法得到的参数值及参数精度进行了较为充分的讨论．在此基础上推导出了简洁实用的计算公式,该公式与较繁杂的传统计算方式比较．具有更好的合理性及规律性。  相似文献   

青藏高原隆升机制新模式   总被引：25，自引：4，他引：21  

李德威 《地球科学》2003,28(6):593-600

作为创建大陆动力学理论体系的最佳野外实验室的青藏高原, 涉及当代固体地球科学前沿和热点的许多重大科学问题.迄今为止, 包括板块构造在内的众多模式不能合理地解释青藏高原重要的地质和地球物理现象.本文从下地壳与中上地壳、造山带与沉积盆地的耦合作用出发, 对青藏高原及邻区进行分尺度、分层块、分阶段的构造解析, 提出青藏高原隆升的下地壳层流构造模式, 认为青藏高原地壳增厚和构造隆升是晚新生代由于锡瓦利克盆地、塔里木盆地和四川盆地下地壳的热软化岩石大量流向青藏高原造成的.   相似文献   

Three Stages of Mesozoic Bimodal Igneous Rocks and Their Tectonic Implications on the Continental Margin of Southeastern China   总被引：7，自引：0，他引：7  

XING Guangfu  YANG Zhuliang  CHEN Rong  SHEN Jialin  WEI Naiyi  ZHOU Yuzhang Nanjing Institute of Geology  Mineral Resources  Ministry of Land  Resources  Nanjing  Jiangsu 《《地质学报》英文版》2004,78(1):27-39

There are large-scale Mesozoic bimodal igneous rock associations on the continental margin of southeastern China. They aroused extensive attention in the 1980s because of their specific tectonic implications, and have been found frequently during recent geological surveys. This paper reviews the studies of regional Mesozoic bimodal rocks, and concludes that they can be subdivided into three stages, i.e., the Early Jurassic (209-170 Ma, the first (Ⅰ) stage), the Late Jurassic-early Early Cretaceous (154-121 Ma, the second (Ⅱ) stage), and the late Early Cretaceous-Late Cretaceous (115-85 Ma, the third (Ⅲ) stage). These three stages of bimodal rocks were formed in different tectonic settings, and are important indicators for regional Mesozoic tectonic evolution.  相似文献   

高精度自动化水平基准装置中微米级微位移平台的应用     

路杰  史雨辉 《大地测量与地球动力学》2011,31(2):145-148

针对高精度水平基准装置人工调试时人为误差大,费时费力等实际,提出一种自动调平方法。  相似文献   

Effects of high CO2 seawater on the copepod (Acartia tsuensis) through all life stages and subsequent generations     

Kurihara H  Ishimatsu A 《Marine pollution bulletin》2008,56(6):1086-1090

We studied the effects of exposure to seawater equilibrated with CO(2)-enriched air (CO(2) 2380 ppm) from eggs to maturity and over two subsequent generations on the copepod Acartia tsuensis. Compared to the control (CO(2) 380 ppm), high CO(2) exposure through all life stages of the 1st generation copepods did not significantly affect survival, body size or developmental speed. Egg production and hatching rates were also not significantly different between the initial generation of females exposed to high CO(2) and the 1st and 2nd generation females developed from eggs to maturity in high CO(2). Thus, the copepods appear more tolerant to increased CO(2) than other marine organisms previously investigated for CO(2) tolerance (i.e., sea urchins and bivalves). However, the crucial importance of copepods in marine ecosystems requires thorough evaluation of the overall impacts of marine environmental changes predicted to occur with increased CO(2) concentrations, i.e., increased temperature, enhanced UV irradiation, and changes in the community structure and nutritional value of phytoplankton.  相似文献   

地球介质的非定常参数黏弹模型   总被引：3，自引：0，他引：3       下载免费PDF全文

施行觉  李成波  Adnan Aydin  黄建华  赵闯 《地球物理学报》2009,52(1):50-56

用开尔文黏弹模型对实验蠕变曲线和冰后期地面抬升观测曲线进行反演,得到相关的黏弹参数,发现所有的黏弹参数都随实验（或观测）时间长度发生有规律的变化, 表明黏弹参数是实验(或观测)时间的函数.在此基础上提出非定常参数的黏弹模型,将通常采用的剪切模量μ₂、弛豫时间τ 和黏度η 相应地从常数修正为时间的函数μ₂(t)、τ(t) 和η（t）,检验表明修正后的开尔文模型可以更好地符合实测蠕变曲线.用修正后的μ₂(t)对软流层的黏度进行估算,其值约为4.6×10²⁰ Pa·s.  相似文献   

IMPACT OF UPLIFT OF TIBETAN PLATEAU AND CHANGE OF LAND-OCEAN DISTRIBUTION ON CLIMATE OVER ASIA^*          下载免费PDF全文

CHEN Longxun  LIU Jiping  ZHOU Xiuji  WANG Pinxian 《Acta Meteorologica Sinica》2000,14(4):459-474

Using an improved CCM1/NCAR climate dynamic model and a combination distribution of land-ocean-vegetation during 40-50 MaBP,a series of numerical experiments representing different stages of the Tibetan Plateau uplifting and different land-ocean distributions are designed to discuss the influence of the Plateau uplifting and land-ocean distribution variation on Asian climate change.It is shown that Tibetan Plateau uplifting can firstly increase the precipitation in China during the period from initial uplift to half height of modern Tibetan Plateau and then decrease the rainfall during the time from the half height to the present plateau. At the same time.the uplifting can reduce surface air temperature over China.Besides.the effects of the uplift and land-ocean distribution change on the variation of winter and summer Asian monsoon circulation are also discussed.  相似文献   

STAGES OF THE NEOTECTONIC MOVEMENT IN THE MENYUAN BASIN, QINGHAI PROVINCE     

Ma Baoqi 《地学前缘》2000,(Z1)

STAGES OF THE NEOTECTONIC MOVEMENT IN THE MENYUAN BASIN, QINGHAI PROVINCE  相似文献   

RELATION BETWEEN RAPID UPLIFTING AND GRAVITATIONAL EQUILIBRIUM ,TECTONICS AND THERMODYNAMIC EFFECT IN QINGHAI—TIBET PLATEAU     

Chi Xiaoguo  Li Cai  Liu Shen  Yang Rihong 《地学前缘》2000,(Z1)

RELATION BETWEEN RAPID UPLIFTING AND GRAVITATIONAL EQUILIBRIUM ,TECTONICS AND THERMODYNAMIC EFFECT IN QINGHAI—TIBET PLATEAU  相似文献