基于灰色线性规划的土地利用结构优化——以云南省澜沧县为例

土地利用结构优化是编制土地利用总体规划的基础和核心。以云南省澜沧县为例,分析该县2000年土地利用结构和社会经济结构状况,以最优化理论为指导思想,运用灰色线性规划方法,结合其未来社会经济发展的需求和有关控制指标,优化该县2015年土地利用结构,为全县土地资源的合理开发利用,获取最佳的社会、经济和生态效益提供“定量”的参考,最终促进区域社会经济又好又快发展。     

内蒙古固阳县席麻塔一带共轭剪切带的地质特征及形成机制

通过区调填图在内蒙古固阳县北山新太古代石英闪长岩和中元古代英云闪长岩中发现了韧性剪切带.通过野外调查、应变测量及显微构造、电子探针等方法研究表明, 该韧性剪切带为两组呈共轭组合型式产出, 形成机制与西伯利亚板块和华北板块相互挤压作用有关, 为在地球较深层次、在压扁环境下的简单剪切, 形成时代为中元古代末期, 变质相为绿片岩相.      

Landscape Dynamics and Driving Factors in Da＇an County of Jilin Province in Northeast China During 1956-2000

The landscape pattern of Da＇an County, Northeast China has undergone significant changes since the 1950s as a result of climatic change and human activities. The aim of this paper is to quantitatively study landscape pattern and its spatial dynamics of Da＇an County at the landscape level over the nearly 50-year span. Patch dynamics were examined according to land use and land cover change processes built from a series of images, as well as topographic maps, and temporal patterns built from landscape pattern metrics. The transition matrix of landscape patch types and changes of various landscape metrics were applied. The results showed that, from 1956 to 2000, the landscape within the study area had undertaken a complicated evolution in landscape structure and composition. The outstanding characteristic is that saline-alkali land increased and grassland decreased. As some smaller patches amalgamated, the heterogeneity of patch decreased. All those changes were the synthetic result of both climatic and anthropogenic influences, but the predominant factor was different in different parts. In the southern part of the study area, the landscape pattern changes resulted from the modification of climate obviously, while in the northern part, the landscape pattern changes were mainly caused by human activities, such as the conversion between farmland and saline-alkali land. This phenomenon showed that human activities played more important role in the north than in the south of Da＇an County.     

烃气测量法在广西南丹县大厂镇更庄地区找矿潜力评价中的应用

广西大厂矿田为一大型-超大型锡多金属矿田。碳沥青、包裹体、矿石成分分析等方面的研究结果表明,区内成矿过程中存在大量有机质的参与,烃类气体是其重要的伴生组分。通过对土壤中的烃类组分分析发现,其背景含量与异常差异很明显,显示区内存在明显的成矿热液活动,深部有较大的找矿潜力。在总结烃类组分和微量元素As、Sb在更庄地区土壤中的异常展布特征的基础上,结合异常分布区的地质和构造条件,圈出了3个找矿有利区。     

Investigations and assessment of the landslide hazards of Fengdu county in the reservoir region of the Three Gorges project on the Yangtze River

The spatial database of landslides in Fengdu County of the reservoir region of the Three Gorges project (TGP) on the Yangtze River was compiled from a variety of different sources including field investigations on landslides, existing catalogues and archives on landslides, reports of meteorological events and human engineering activities that triggered slope failures. The major factors that are found to have affected the slope stabilities are outlined, and an assessment and zonation of landslide hazards of the region is made using an integrated information model, which is divided into destructive, disastrous, likely disastrous and essentially non-disastrous areas from the assessment of landslide hazards. The destructive and disastrous areas are respectively 1.9 and 13.8% of the total region, mostly being nearby townships, highways along the south bank of the Yangtze River and residential quarters along two flanks of the Yangtze River and its distributaries, that will impose direct impact to highway transportation and residential lives, and may effect to some degree the navigation of the Yangtze River, reservoir banks, and building of cities and towns.     

福建永安丰门坑多金属矿地质特征及找矿前景

永安丰门坑多金属矿呈似层状、层状、透镜状,贮存在寒武系林田组下段钙质碎屑岩中,矿床具明显的层控和热液叠加改造特征,为沉积-热液改造型多金属矿床。该多金属矿床的发现,为我省在寒武系林田组中寻找该类矿床提供新的目标。     

贵州务川瓦厂坪铝土矿床地球化学特征

务川瓦厂坪铝土矿床是近年探明的大型矿床,332+333资源量4397万吨.地球化学研究显示,矿床中Al_2O_3与TiO_2含量成正相关关系,与SiO_2含量成负相关关系;硫同位素组成属于沉积岩范畴,总体显示出变化范围大(-29.20‰～+12.40‰),反映出复杂的成矿环境和轻重硫同位素的多次分离;不同岩、矿石的稀土总量(∑REE)含量变化大,LREE/HREE均大于1,显示轻稀土较富集;铝土矿层中,土状铝土矿稀土元素含量相对高,致密块状铝土矿含量相对低,稀土元素含量与矿石质量总体呈正相关关系.铝土矿层及志留系韩家店组的稀土总量含量较接近.矿床成因属古风化壳沉积型.     

河北省灵寿县西石门金矿黄铁矿热电性标型及其找矿意义

河北省灵寿县西石门石英脉型金矿位于华北地台太行隆起区之南东部的阜平矿集区,与该区石湖大型金矿受不同断裂控制。黄铁矿是矿床的主要载金矿物,以4个世代产出于黄铁矿-石英阶段(I)、石英-黄铁矿阶段(II)、多金属硫化物阶段(III)和石英-碳酸盐阶段(IV)等4个成矿阶段,其中,石英-碳酸盐阶段的黄铁矿十分稀少。本矿段黄铁矿单晶热电系数变化范围为-328~341μV/℃,从早期到晚期,4个世代的黄铁矿热电系数离散性先增大再减小,石英黄铁矿阶段（II）离散性最大。从黄铁矿-石英阶段(I)至石英-碳酸盐阶段(IV),黄铁矿热电导型的变化规律是P>N(III)→P>>N (IV); P型黄铁矿热电系数均值αP和出现率P%由浅部到深部,总体为逐渐降低,局部呈波状起伏,与矿石金品位呈正相关关系.黄铁矿的热电系数温标计算和投图表明,该矿床的成矿温度集中在168～330℃,为中低温矿床。热电系数在50—200μV/℃之间的黄铁矿是富金矿段的标志。综合分析认为,该矿床290m以下仍有良好的找矿潜力。     

河北尚义侏罗系后城组节理研究

研究区侏罗系后城组地层发育着多组节理,根据其方位及相互关系,自早到晚分为５个节理组,其定向分别为１７４°、７７°、５８°、１４５°和１１９°,反映出节理形成的最大主压应力方向交替变化和偏转。岩石应变强度具有由弱至强,再由强至弱的演化趋势,而节理型式趋向不规则。区内节理多属构造成因,推测形成于侏罗纪末至白垩纪初近南北向的区域挤压过程。热液活动在区内节理形成之后,而后１１９°方位节理组发生右行走滑。     

吉林省辉南县地质灾害调查与区划空间数据库的建设

辉南县地质灾害调查与区划空间数据库建设是以Mapgis6.0软件作为工作平台,利用"县(市)地质灾害调查与区划信息系统"软件将辉南县地质灾害调查成果数据进行采集、存储、管理、分析,为辉南县地质灾害防治规划工作提供依据。