新疆地区场地条件分区及其矢量化   总被引：1，自引：0，他引：1  

刘军  胡伟华  宋立军  李帅 《内陆地震》2014,(1):70-74

利用地形地貌、等高线资料对新疆地区场地条件进行初步分类,并通过地震安评钻孔资料的岩石剪切波速(或土的等效剪切波速)和覆盖层厚度双参数法对局部场地条件分区进行优化,最后采用ArcGIS软件对场地分区数据进行矢量化工作及数据质量控制。  相似文献   

Mineralogical and geochemical characteristics of scheelite-bearing skarns,and genetic relations between skarn mineralization and petrogenesis of the associated granitoid pluton at Sargipali,Sundergarh District,Eastern India   总被引：1，自引：0，他引：1  

Sangita Chowdhury  David R. Lentz 《Journal of Geochemical Exploration》2011

Skarn rocks occur at the contact between calcite-bearing dolomitic marbles and granitoids (massive varieties with pegmatites) in close spatial association with the mica schist-hosted Proterozoic Pb–Cu–Ag sulfide deposits at Sargipali, Sundergarh District, Eastern India. The exoskarn (pyroxene–garnet) of variable width (1 to 30 m) occurs in marble proximal to the granitic intrusion, and endoskarn (pyroxene–epidote) is variably developed (< 1 to 10 m). Molybdenum-free scheelite with minor pyrrhotite (0.2%) is found only in late garnet–clinopyroxene exoskarn assemblages.  相似文献   

新一轮土地整治规划分区研究——以山东省肥城市为例     

毛美桥  许庆福  丁喜莲  董锦  熊军 《山东地质》2012,(8):61-64

进行土地整治分区是编制土地整治规划的重要内容之一。以往的土地整理复垦开发分区已不能适应当前土地整治工作管理的需要。该文以山东省肥城市为例,提出了土地整治分区的原则和方法,从宏观尺度上,运用聚类分析法进行土地整治综合分区,从中观尺度上,运用叠图法进行土地整治功能分区,并指出了不同区域土地整治的方向和重点。  相似文献   

Regionalization with dynamically constrained agglomerative clustering and partitioning (REDCAP)     

D. Guo 《International journal of geographical information science》2013,27(7):801-823

Regionalization is to divide a large set of spatial objects into a number of spatially contiguous regions while optimizing an objective function, which is normally a homogeneity (or heterogeneity) measure of the derived regions. This research proposes and evaluates a family of six hierarchical regionalization methods. The six methods are based on three agglomerative clustering approaches, including the single linkage, average linkage (ALK), and the complete linkage (CLK), each of which is constrained with spatial contiguity in two different ways (i.e. the first‐order constraining and the full‐order constraining). It is discovered that both the Full‐Order‐CLK and the Full‐Order‐ALK methods significantly outperform existing methods across four quality evaluations: the total heterogeneity, region size balance, internal variation, and the preservation of data distribution. Moreover, the proposed algorithms are efficient and can find the solution in O(n ²log n) time. With such data scalability, for the first time it is possible to effectively regionalize large data sets that have 10 000 or more spatial objects. A detailed comparison and evaluation of the six methods are carried out with the 2004 US presidential election data.  相似文献   

计算分带序列的重心法程序     

朴寿成  连长云 《吉林地质》1995,14(4):69-74

重心法与其它计算原生晕分带序列的方法相比，具有比较明显的优点。本文详细论述了重心法的计算步骤和计算机程序中各主要模块的，说明在此基础上给出该方法的源程序。程序用ＢＡＳＩＣ语言编写，易于操作。  相似文献   

界牌岭锡矿床蚀变矿化分带及其成因探讨   总被引：2，自引：0，他引：2  

彭振安 《矿产与地质》1991,5(4):293-299

湖南界牌岭锡矿床蚀变矿化可分为条纹状云母萤石岩化—铍矿化带,细脉状云母萤石化—铅锌矿化带、黄玉—萤石—云英岩化—锡铜锌多金属矿化带和弱—无蚀变矿化带.不同蚀变矿化带物质组分迁移规律有不同的特点.其成矿物质主要来源于花岗斑岩,该矿床是与陆壳重熔型花岗岩类斑岩体有成因联系的斑岩型锡矿床.  相似文献   

对钻孔漏失层分类的研究与探讨     

王志远 《湖南地质》1989,8(3):58-64

目前的漏失层分类方案很难适用于错综复杂多因素影响的孔漏情况。针对这一缺陷,本文通过对影响“似漏失量”的四个主要因素进行分析后提出以“似漏失量”的大小来划分钻孔漏失层类型。该方案简单、实用、便于推广。  相似文献   

元素分带及其在地质找矿中应用的几个问题   总被引：2，自引：2，他引：2  

伍宗华  金仰芬 《物探与化探》1993,17(1):7-13

本文介绍了元素分带的研究概况,不同热源体周围元素的分带特征。讨论了将元素分带用于预测盲矿和评价矿体剥蚀程度中值得注意的几个问题。  相似文献   

新版美国地震区划图源及其参数模型的分析与评述   总被引：6，自引：4，他引：2  

潘华  高孟潭  李金臣 《震灾防御技术》2009,4(2):131-140

2008年版《美国地震危险性图》（本文称“美国地震区划图”）采用5种类型震源区模型。本文全面分析了这些震源模型的划分目的、划分原则、基本特征、用途、各类型源间的相互关系,及其地震活动性参数确定的原则与基本方法。评述了美国地震区划图震源区模型及其地震活动性参数确定的特点和存在的问题。以期为我国新一代地震动参数区划图编制提供参考。  相似文献   

Responses and adaptation strategies of commercial and charter fishers to zoning changes in the Great Barrier Reef Marine Park     

Elodie J.I. LédéeStephen G. Sutton  Renae C. TobinDebora M. De Freitas 《Marine Policy》2012,36(1):226-234

Fishers' responses to changes in resource access through the imposition of marine protected areas can be a critical factor influencing the likelihood of achieving management objectives.Face-to-face interviews with 114 commercial and charter fishers were conducted to investigate their responses and adaptation strategies to the increase in the size and number of no-take zones imposed by the 2004 Great Barrier Reef Marine Park zoning plan. Despite holding positive attitudes towards marine biodiversity protection, fishers were generally unsupportive of the new zoning plan 5 years after its implementation. Fishers' lack of support was related to the perception that they had not been adequately engaged in the rezoning process and the perception of significant impacts of the zoning plan on fishing businesses. Fishers generally believed that the new zoning plan had a negative impact on their access to productive fishing areas, the numbers of fish they catch, the profitability of their fishing business, and their personal income. In response to the new no-take zones, fishers tended to redistribute their fishing activity to locations closer to their home port, and to locations already known to them through their previous fishing, resulting in an increase in high density fishing locations within the park. Despite the impacts that fishers experienced, most reported that they have adapted their fishing activity and fishing business at least moderately well to the new zoning plan, suggesting that many of the impacts experienced by fishers might be short-term and may decline over time as fishers learn to adapt to the new zoning system. The information provided should prove valuable as a baseline for continued monitoring of the costs and benefits of the Great Barrier Reef Marine Park rezoning into the future.  相似文献