雅鲁藏布江缝合带造山型金矿床成矿流体特征:来自He-A r同位素的约束   总被引：1，自引：0，他引：1  

赵晓燕  杨竹森  张雄  裴英茹 《地质学报》2021,95(2):463-475

雅鲁藏布江缝合带造山型金成矿带是近些年来在青藏高原新确立的碰撞造山型金成矿带,成矿流体是一套CO2-H2 O-NaCl-CH4-N2体系,以变质水为主.为探讨地幔组分对成矿的影响,本文选取雅鲁藏布江缝合带内邦布矿床和念扎矿床两个大型的造山型金矿为研究对象,对与成矿相关的黄铁矿及胶黄铁矿进行He-Ar同位素分析.结果显示...  相似文献   

论泥石流沉积与环境     

熊黑钢  崔之久 《山地学报》1991,(1)

甘肃武都地区及陕西某些地区典型泥石流沉积剖面,可分为A,B,C,D,A′5种相。不同的相组合,剖面沉积特征及纵、横剖面等,都从不同的角度较好地记录了环境变化。  相似文献   

A generalized time-dependent local convection theory     

Da-run Xiong 《Chinese Astronomy and Astrophysics》1985,9(1):1-7

The time-dependent convection theory given in [1] is generalized to include non-radial oscillations. Under some reasonable assumptions, dynamic equations are derived of the auto-correlation and cross-correlation functions of the velocity and temperature fluctuations. Steady and pulsating components are separated and solved for. Our steady component agrees with Vitense's formulae. The pulsating component contains a phase-lag, due to the inertia of the convective motion.  相似文献   

稠油注蒸汽热采过程中的水化学问题     

李雨新 《地球科学与环境学报》1993,(4)

本文简要论述了稠油注蒸汽采过程中所引发出的水化学问题,指出:在注蒸汽热采过程中,随着蒸汽的注入,将在储层内自注热井向四周逐渐形成一些连续过渡的温、压、pH值和水相状态不同的汽水浸润带,即蒸汽饱和带→蒸汽过热水混合带→过热水带→与储层温压条件相当的热水带,由于各带内状态条件的不同,故各带内所引发出的水-岩作用(包括矿物的溶解与沉淀作用)将是有所不同的,因而对各带内储层孔隙结构的影响程度也将是不同的。文中还扼要地介绍了对此进行水化学研究的方法原理和研究途径。  相似文献   

沉降网变形分析计算的实用方法     

周雄 《地球科学与环境学报》1995,(4)

本文从变形分析的一般原理出发，通过研究沉降监测网的图形矩阵特点，给出了变形分析计算的一般方法。所给公式意义明确，很便于在实际中具体应用。本文最后通过算例说明了整个计算过程。  相似文献   

THE　ORIGIN　AND　CHARACTERISTICS　OF　THE　GLACIAL　DEBRIS　FLOW　IN　THE　DUKU　HIGHWAY　OF　TIANSHAN　MOUNTAINS，     

熊黑钢  刘耕年  崔之久  宋长青 《中国地理科学(英文版)》1996,6(3):282-288

ＴＨＥＯＲＩＧＩＮＡＮＤＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＧＬＡＣＩＡＬＤＥＢＲＩＳＦＬＯＷＩＮＴＨＥＤＵＫＵＨＩＧＨＷＡＹＯＦＴＩＡＮＳＨＡＮＭＯＵＮＴＡＩＮＳ，ＣＨＩＮＡ￥ＸｉｏｎｇＨｅｉｇａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ...  相似文献   

监测网设计的逆特征值法     

周雄 《大地测量与地球动力学》1996,(1)

利用监测网具有监测方向性这一特点，在监测网设计中应用矩阵逆特征值理论构造准则矩阵，并结合算例论述了监测网的二类设计。  相似文献   

In Search of the Cretaceous-Tertiary Boundary in Heilongjiang River Area of China   总被引：1，自引：0，他引：1  

Sun G  M.Akhmetiev  Dong Z.M  A.R.Ashraf  Sun Y.W  E.Bugdaeva  D.L.Dilcher  L.Golovneva  I.Harding  K.Johnson  T.Kezina  T.Kodrul  LU J.S  V.Markevich  H.Nishida  H.Okada  Park S.O  Sun C.L  Xiong X.Z  Xing Y.L  Zhou Z.L 《世界地质(英文版)》2002,5(2)

Abstract A new geological section recognized in Baishantou of Jiayin, Heilongjiang Province, China, was studied preliminarily in searching for the K/T boundary. An early Paleocene florule characrerized by abundant Tiliaephyllum tsagajanicum leaves and its associated plants, was collected from the Baishantou Member (new member representing the lower part of the Paleocene Wuyun Formation) overlying the possible K/T boundary. A tuff bed was found from the upper part of the Furao Formation (uppermost Cretaceous) in this section. The new findings imply that the K/T boundary is probable lying in the interval between the base of the Baishantou Member and the tuff bed, based on the correlation of the present strata with the stratotype of the Tsagajan Group spanning the K/T boundary in "Belaya Gara" of the Bureya Basin, Russia. The early Paleocene florule from the Baishantou Member and the early-middle Maastrichtian dinosaurs found from the Yuliangzi Formation underlying the Furao Formation suggest that the Baishantou section is more promising for searching for the K/T boundary in this area. Further studies of the section is needed, integrating paleontological, biostratigraphic, geochemical, paleomagnetic, and sedimentary research would benefit our understanding the mass extinction event and biotic recovery in the Heilongjiang River area, China, and even all of northeast Asia during the K/T boundary interval.  相似文献   

虚拟现实及其在军事测绘与作训模拟中的应用     

高俊  游雄 《测绘学院学报》1996,(2)

虚拟现实是由计算机生成的人造环境或对象,它可以与操作者交互,构成一个封闭的系统,使人有身临其境之感。这一技术扩展了人的认知手段和范围,改变了传统的仿真与模拟方式,已引起了各个专业领域的重视。测绘工程为虚拟现实技术提供了理论、方法和数据基础,并应把这一技术作为下一世纪测绘保障的新手段而给予重视和开发。  相似文献   

Three-Dimensional Gravity Modeling In All Space   总被引：11，自引：2，他引：9  

Xiong Li  Michel Chouteau 《Surveys in Geophysics》1998,19(4):339-368

We review available analytical algorithms for the gravity effect and gravity gradients especially the vertical gravity gradient due to a right rectangular prism, a right polygonal prism, and a polyhedron. The emphasis is placed on an investigation of validity, consistency, and especially singularities of different algorithms, which have been traditionally proposed for calculation of the gravity effect on ground (or outside anomalous bodies), when they are applied to all points in space. The rounding error due to the computer floating point precision is estimated. The gravity effect and vertical gradient of gravity in three dimensions caused by a cubic model are calculated by different types of algorithms. The reliability of algorithms for the calculation of gravity of a right polygonal prism and a polyhedron is further verified by using a regular polygonal prism approximating a vertical cylinder and a regular polyhedron approximating a sphere, respectively. By highlighting Haáz-Jung-Plouff and Okabe-Steiner-Zilahi-Sebess' formulae for a right rectangular prism, Plouff's algorithm for a right polygonal prism, and Gouml;tze and Lahmeyer's algorithm for a polyhedron and removing their singularities, we demonstrate that these formulae and algorithms can be used to model the gravity anomaly and its vertical gradient at all possible computation positions.  相似文献