基底岩系对火山岩型金矿成矿的意义   总被引：1，自引：0，他引：1  

刘秉光  易善锋 《地质与资源》1995,4(2):81-85

本文以浙江治岭头、黑龙江团结沟、辽宁二道沟和日本菱刈等四个金矿床为例,说明火山岩型金矿之矿体除产于火山岩中之外,亦产于火山岩下伏基底岩系中,其基底岩系对火山岩型金矿成矿的意义在于:①基底岩石原岩常含有基性和超基性岩所含金丰度较高,且同位素资料显示出成矿的部分金来源于基底岩石;②基底岩系所含碳较高有利于金的成矿;③基底岩块相应上隆部位是成矿有利地带。  相似文献   

夏季太平洋低纬地区季风环流与信风环流一种可能的连接机制     

陆胜元  易兵 《热带气象学报》1985,(3):217-224

北半球夏季太平洋低纬地区的平均经向环流,西部(150°E以西)为季风环流;中部和东部(170°W以东)为信风区的Hadley环流;150°E—170°W之间为季风环流与信风环流的连接区或过渡区。连接季风环流与信风环流的水平环流系统,在高层为太平洋中部热带对流层高层槽(TUTT),低层为强大的太平洋副热带高压。太平洋中部高空槽区就是季风环流与信风环流的连接区或过渡区。本文分析了高空槽的流场结构,并根据各层水平环流和各经度带的垂直环流给出了太平洋低纬地区的三维气流分布示意图。   相似文献   

Observations of Dynamic Turbulence in the Lower Stratosphere over Inner Mongolia Using a High-resolution Balloon Sensor Constant Temperature Anemometer     

Xiaoyu REN  Yi LIU  Zhaonan CAI  Yuli ZHANG 《大气科学进展》2022,39(3):519-528

We present characterizations of the dynamic turbulence in the lower stratosphere measured by a new balloon-based system designed for detecting finer scale dynamic turbulence. The balloon-based system included a constant temperature anemometer(CTA) operating at a sampling rate of 2 k Hz at an ascent speed of 5 m s^-1(corresponding to a vertical resolution of 2.5 mm), an industrial personal computer, batteries, sensors for ambient temperature and humidity, an A/D converter, and others. The system was successfully launched to 24 km altitude over Bayannur City, Inner Mongolia Province. Results show the spatial intermittence of the turbulence layers, with clear boundaries between turbulent and nonturbulent regions. This is the first time that the dynamic turbulence spectrum down to the viscous sub-range has been obtained throughout the lower stratosphere over China. With that, the energy dissipation rates of dynamic turbulence could be calculated with high precision. The profile of the dissipation rates varied from 7.37 × 10^-7 to 4.23 W kg^-1 and increased with altitude in the stratosphere.  相似文献   

一种顾及各向异性的数字水深模型插值方法     

陈轶  彭认灿  张立华  郑义东  董箭  李宁 《海洋测绘》2011,31(5):31-33

提出了一种顾及各向异性的数字水深模型插值方法,通过局部水深信息解析海底地形的微地貌结构特征,构建了顾及距离和方向的水深插值模型。实验证明,所提方法较距离反比例平方加权法能更多地保留地形信息,同时具有更高的插值精度和插值稳定性。  相似文献   

华北克拉通北缘柴胡栏子金矿富甲烷流体包裹体的发现及地质意义     

张宇  唐名鹰  李永刚  陆丽娜  卢欣祥  朱德全  何玉良  彭翼  黄斐  王炜晓 《地质学报》2022,96(4):1321-1339

柴胡栏子金矿位于华北克拉通北缘赤峰-朝阳金矿集区西段,是区内典型的石英脉型为主的金矿床,也是赤峰-朝阳地区首次发现的含大量单相甲烷包裹体群的金矿床.矿体呈脉状产于太古宙建平群大营子组下岩段含石墨绢云母片岩切层断裂中,金主要产出在蚀变含石墨绢云母片岩和石英脉中.根据野外观察和包裹体测温结果,将柴胡栏子金矿流体成矿过程划分...  相似文献   

用连续小波变换分析探地雷达回波信号   总被引：5，自引：1，他引：4  

詹毅  李修忠  梁昌洪  岳元俊 《物探与化探》1999,23(6):443-447,453

脉冲探地雷达回波信号是典型的非平稳、非线性信号.本文通过连续小波变换,对地下圆柱目标实测结果进行分析,得到了目标冲击响应的典型波形特征.分析结果证明,这种方法可以有效地用于目标检测,时延估计等脉冲探地雷达信号处理中的关键问题  相似文献   

沉积盆地中恢复地层剥蚀量的新方法   总被引：33，自引：0，他引：33  

王毅  金之钧 《地球科学进展》1999,14(5):482-486

主要介绍了磷灰石裂变径迹分析法,沉积波动过程分析法和宇宙成因核素分析法等３种恢复和计算地层剥蚀量的新方法。它们的优点是不但给出一个剥蚀面造成的地层总的剥蚀量,还能详细刻画整个剥蚀过程,从而能计算出每一期构造抬升引起的地层剥蚀量。  相似文献   

GIS在土地管理信息化方面的应用   总被引：2，自引：0，他引：2  

翟翊  王玉明 《四川测绘》1999,22(2):80-82

本文从土地信息数据的采集、处理以及数据的共享三个方面探讨了目前GIS在土地管理信息化方面的应用,并对GIS在土地信息化方面的进一步发展进行了分析讨论。  相似文献   

北京1980～1994年降雪的天气气候分析   总被引：12，自引：1，他引：11  

仪清菊  刘延英  许晨海 《应用气象学报》1999,10(2):249-254

该文利用15年资料,分析了北京降雪的天气气候特点。主要结果是:降雪年际变率大;11月、2月和3月雪量大;降雪的环流型主要有低槽（涡）型和中亚低槽东亚高后型两类;充沛的水汽和能量是北京降雪的必要条件。  相似文献   

Forced regression and its sedimentary response to continental lacustrine rift basin: A case of the Member 3 of Shahejie Formation in Laizhouwan sag,Bohai Bay Basin          下载免费PDF全文

Qin Yi  Zhu Xiao-Min  Wang Tong  Guo Cheng  Xie Shuang-Hui 《古地理学报》1999,22(3):457-468

Falling stage systems tract(FSST)is an offlap strata with strong relationship with hydrocarbon exploration,which is driven by relative lake-level fall and developed above the highstand systems tract and below the lowstand systems tract of a new sequence. It has no relationship with sediment supply. Based on the theory of sequence stratigraphy and sedimentology,3D seismic data,drilling core data,and well-logging data were comprehensively analyzed. The study showed that the FSST strata was formed in the Member 3 of Shahejie Formation in the Laizhouwan sag. The FSST can be divided into three units,namely as units P1,P2,and P3 from bottom to top. The P1 is the first unit of progradation downlap the bottom of the FSST. The top of the unit P3 is a sequence boundary exhibits subaerial unconformity. The seismic profile along the source direction is characterized by the low-angle oblique progradation reflection that downstream the center of lake basin from west to east. Incised valleys developed on the top of the FSST perpendicular to the source direction. Gamma-ray logging response is manifested by a series of funnel-shaped complex,indicating that the sedimentary response of the FSST was a cycle of coarsening-upward parasequence sets. Comprehensive studies on core interpretation and well-logging analysis showed that the FSST was a fluvial-delta sedimentary system with slumped fan deposits associated with the delta front. Consequently,the FSST is a common result of relative dry climate and falling of lake level,considering regional tectonic evolution,sediment supply,and paleo-climate change. The discovery of the FSST in the Laizhouwan sag has an important geological significance for the sedimentological interpretation,and it offers a guidance for further oil exploration in the study area. In addition,it also serves as a significant reference for future research on the FSST development and exploration in the continental lacustrine rift basin.  相似文献