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991.
Delaunay三角网是DEM主要表示方式,一直以来,因其数据结构和构造算法的复杂性导致应用受限。本文结合随机增量式算法理论,提出一种全新的有向无环图(directed acyclic graph,DAG)查找数据结构(search data structure)和随机增量式Delaunay三角网构造算法,并对算法作了简要证明和深入分析。该算法最大的特点是具有随机特性,能够支持地形特征数据的动态更新。 相似文献
992.
现代小卫星技术是近些年来迅速发展起来的航天领域高新技术,利用该技术为地球观测服务是一件远景可观、意义深远的事情。在对地观测卫星的诸多关键技术之中,地面站的设计是一个很重要的方面。本文主要对对地观测卫星地面站的站址选择与布局进行了详细的讨论。 相似文献
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WEI Ran WANG Yitian MAO Jingwen HU Qiaoqing QIN Siting LIU Shengyou YE Dejin YUAN Qunhu DOU Ping 《《地质学报》英文版》2020,94(4):884-900
The extensive Changba-Lijiagou Pb-Zn deposit is located in the north of the Xihe–Chengxian ore cluster in West Qinling. The ore bodies are mainly hosted in the marble, dolomitic marble and biotite-calcite-quartz schist of the Middle Devonian Anjiacha Formation, and are structurally controlled by the fault and anticline. The ore-forming process can be divided into three main stages, based on field geological features and mineral assemblages. The mineral assemblages of hydrothermal stage I are pale-yellow coarse grain, low Fe sphalerite, pyrite with pits, barite and biotite. The mineral assemblages of hydrothermal stage II are black-brown cryptocrystalline, high Fe shalerite, pyrite without pits, marcasite or arsenopyrite replace the pyrite with pits, K-feldspar. The features of hydrothermal stage III are calcite-quartz-sulfide vein cutting the laminated, banded ore body. Forty-two sulfur isotope analyses, twenty-five lead isotope analyses and nineteen carbon and oxygen isotope analyses were determined on sphalerite, pyrite, galena and calcite. The δ34 S values of stage I(20.3 to 29.0‰) are consistent with the δ34 S of sulfate(barite) in the stratum. Combined with geological feature, inclusion characteristics and EPMA data, we propose that TSR has played a key role in the formation of the sulfides in stage I. The δ34 S values of stage II sphalerite and pyrite(15.1 to 23.0‰) are between sulfides in the host rock, magmatic sulfur and the sulfate(barite) in the stratum. This result suggests that multiple S reservoirs were the sources for S2-in stage II. The δ34 S values of stage III(13.1 to 22‰) combined with the structure of the geological and mineral features suggest a magmatic hydrothermal origin of the mineralization. The lead isotope compositions of the sulfides have 206 Pb/204 Pb ranging from 17.9480 to 17.9782, 207 Pb/204 Pb ranging from 15.611 to 15.622, and 208 Pb/204 Pb ranging from 38.1368 to 38.1691 in the three ore-forming stages. The narrow and symmetric distributions of the lead isotope values reflect homogenization of granite and mantle sources before the Pb-Zn mineralization. The δ13 CPDB and δ18 OSMOW values of stage I range from-0.1 to 2.4‰ and from 18.8 to 21.7‰. The values and inclusion data indicate that the source of fluids in stage I was the dissolution of marine carbonate. The δ13 CPDB and δ18 OSMOW values of stage II range from-4 to 1‰ and from 12.3 to 20.3‰, suggesting multiple C-O reservoirs in the Changba deposit and the addition of mantle-source fluid to the system. The values in stage III are-3.1‰ and 19.7‰, respectively. We infer that the process of mineralization involved evaporitic salt and sedimentary organic-bearing units interacting through thermochemical sulfate reduction through the isotopic, mineralogy and inclusion evidences. Subsequently, the geology feature, mineral assemblages, EPMA data and isotopic values support the conclusion that the ore-forming hydrothermal fluids were mixed with magmatic hydrothermal fluids and forming the massive dark sphalerite, then yielding the calcite-quartz-sulfide vein ore type at the last stage. The genesis of this ore deposit was epigenetic rather than the previously-proposed sedimentary-exhalative(SEDEX) type. 相似文献
998.
东平金矿位于辽西凌源-阜新金成矿带上,金矿(化)体主要赋存在硅化构造角砾岩、硅化流纹岩和硅化流纹质角砾熔岩中.矿石以自然金和银金矿为主,其中自然金约占80%,银金矿约占20%.激电中梯及钻探结果显示矿体主要受北北西向构造控制,金矿(化)体主要位于高阻低极化率的F2构造蚀变带内.土壤地球化学测量圈定综合异常22处,Ⅰ-4异常区经钻探验证发现多个隐伏金矿(化)体.在详细研究矿床地质特征的基础上,通过对比邻区赵家沟金矿,初步推断其成因类型为低温热液型金矿.同时认为区内北北西向构造蚀变带内具有的黄铁矿化、强硅化和碳酸盐化是主要的矿化蚀变信息,高阻低极化率及Au土壤地球化学综合异常带是重要的找矿方向. 相似文献
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胡兆量 《中国地理科学(英文版)》1998,8(4):326-334
I.THENATUREOFSEVENECONOMICZONESOnmarch17th,1996,thefourthmeetingoftheEighthNationalPeople’sCongresputforwardaproposalofconstr... 相似文献
1000.
Eight spatial structure types are determined through morphology, hydrogeology, hydrology and impulse response in karst districts, with the well studied Houzhai subterranean stream in Puding, Guizhou Province as a sample research area. These types contain peak-forest basin, peak-forest laterite platform, resurrected peak-forest basin, old peak-forest-funnel depression, peak-forest-funnel, peak-forest-funnel depression, peak-cluster valley and peak-forest-doline. In the area, each of them has its respective surface and subterranean structural feature, and morphology, hydrogeology, hydrology and impulse response as well. The difference of responses of subsurface system in different spatial structure types are obtained by time series analysis, frequency spectrum research and decline curve calculation of material current. According to the analysis of the aquifer feature, the upper reaches of suburfall stream is dominated by pipeline flow, the lower reaches is characterized by braided fissure flow drainage system and mixed characteristic exists in the middle reaches. The result of the impulse test shows that the large ascending range of stage in the test on swash condition is in fissure system. However, in pipeline type, especially in the subterranean stream where there is waterfall or incomplete fill of underground water, the ascending range of stage is one quantity level less than the impulse range of stage at some fissure types, showing that change range of stage can indicate the spatial structure characteristics of certain area upper the station. The main direction of karst geomorphic evolution there is positive course except in the west area. It can be seen that karst geomorphological evolution direction can change when discharge datum plane influences some part of a relatively large drainage. In certain time unit, the upper reaches are controlled by old datum plane and the lower reaches by new datum plane. Two opposite geomorphological evolution directions can exist in one drainage. 相似文献