Urban Construction Land Suitability Evaluation Based on Improved Multi-criteria Evaluation Based on GIS （MCE-GIS）： Case of New Hefei City,China

Urban construction land suitability evaluation （UCLSE） is a complex system engineering and the basis for rational use of the limited urban land resources in China. It has an important practical value on urban construction land use planning and management from the angle of methodology. As a widely used technique, traditional multi-criteria evaluation based on GIS （MCE-GIS）, is not suitable for UCLSE. This study develops an improved MCE-GIS method which could be more suitable for UCLSE based on urban complex ecological system theory and the summary of the shortcomings of traditional MCE-GIS. The improvements include three aspects： a composite evaluation index system rather than natural indexes alone, an index weight calculated by using fuzzy Analytic Hierarchy Process （AHP） method rather than the common AHP method, and the integrated overlay rule, which includes selecting the minimum value, weighted linear combination （WLC） and simple summation. The main advantage of this improved technique is that it can make UCLSE more comprehensive, more operational and more reasonable. It can provide a scientific basis for decision making in the planning and management of urban construction land use. The improved MCE-GIS system has been adopted in the New Hefei City, Anhui Province, China. Based on the results of UCLSE in New Hefei, three functional areas including construction-appropriate areas, construction-restricted areas and construction-forbidden areas could be worked out, in which 36.90% of the total study area could be developed as urban construction land and the remaining 63.10% should be protected as reserves land or as ecological land. Furthermore, the results can orovide scientific decision suooort for spatial planning and eco-environment nrotection in New Hefei.     

地面沉降模拟计算的灰色离散GM（1，1）模型

地面沉降的模拟计算属于灰色问题,建立一个有效的灰色预测模型是十分重要的,在分析灰色线性回归组合模型模拟序列特点的基础上,建立了以原始数据直接建模的离散GM（1,1）模型（称为ODGM（1,1）模型）,将某沉降实例数据建立ODGM（1,1）模型,并与灰色线性回归组合预测模型进行比较,结果证明离散GM（1,1）模型优于灰色线性回归组合预测模型。     

松辽盆地姚家组—嫩江组沉积演化与成藏响应

松辽盆地姚家组—嫩江组是一套完整的基准面升降旋回沉积地层,嫩江组二段底部最大湖泛面形成了盆地范围内稳定分布的油页岩,不仅是层序及地层对比的标准界面,而且成为重要的烃源岩层和盖层。姚家组及嫩江组一段是湖进形成的大型湖泊与退积型三角洲沉积,嫩江组二段到五段是强制性水退形成的大型湖泊与进积三角洲沉积;在湖进期嫩江组一段长轴物源方向发育大型重力流水道及末端浊积扇沉积,在嫩江组二段强制性水退环境下进积型三角洲前方发育大型滑塌扇沉积;储集层是湖进-湖退过程中形成的大型三角洲复合体,以分流河道、河口坝及席状砂体为特征,这些砂体向湖盆中心延伸楔入湖相泥岩及成熟烃源岩中,形成良好的生储盖组合关系,特别是盆地长轴物源方向发育的大型三角洲复合体成为油藏集中发育的良好场所,是松辽盆地成为巨型陆相含油气盆地的重要地质条件,同时重力流水道及滑塌扇体也具有形成岩性油气藏的有利条件,是不可忽视的勘探领域。     

MT有限元模拟中截断边界的影响

利用有限元方法进行大地电磁正演数值模拟时,由于是在有限网格区域上的数值计算,模拟计算时的网格边界为截断边界,而有限元数值模拟时的大地电磁场边界条件需要在足够远处才能够满足,所以截断边界的存在可能会使大地电磁正演模拟的边界条件无法满足,致使对计算结果和计算精度产生影响。利用有限元二维正演程序,在网格边界处加载一维情况下的大地电磁场,然后固定研究区域的网格剖分,并对一维地电模型和二维地电模型在改变有限元网格边界大小的情况下进行计算。在对一维模型进行模拟计算时,截断边界对边界条件没有影响,边界条件自然满足。而对二维模型进行模拟计算时,截断边界的存在对计算结果有较大影响。利用趋肤深度作为有限元网格边界变化的量度,通过改变网格边界大小,对不同的二维地电模型进行计算比较,总结出适合大地电磁有限元正演模拟的参考网格边界。     

利国矿区铜（金）成矿条件的研究

利国矿区是江苏省重要铁矿基地之一,矿区位于秦岭一昆仑纬向构造带东延的南侧与新华夏构造体系第三隆起带的交接复合部位。铁矿床主要产于燕山期闪长玢岩杂岩体与下奥陶统碳酸盐地层的接触带及其附近灰岩中,矿体呈似层状一透镜状等,产状与围岩一致,具层控矿床的特征。笔者主要从成矿地质特征着手,分析总结了该区铜、金矿化特征及主要成矿规律,指出了利国矿区铜（金）矿的找矿方向和有望靶区。     

基于MAPGIS的区域化探异常查询系统的开发

随着地理信息系统（GIS）技术的不断完善,利用GIS的空间数据（矢量化数据）与化探测量数据（定量数据）的有机结合,建立基于地理信息系统（GIS）空间数据库对已有的海量化探数据进行统一管理,并开发基于GIS空间信息技术的地球化学异常查询系统,是化探相关地质信息提取的有效途径。     

具磷灰石假象绿松石的岩石矿物学及谱学特征

采用x射线粉晶衍射（XRD）、博里叶变换红外光谱（FTI码以及拉曼光谱等方法对安徽马鞍山具磷灰石假象的绿松石进行了研究。结果表明：其主要矿物组成为绿松石,保留了磷灰石六边形的形态特征。XRD~U试的特征谱线d值为36745～36748（111）、29008～29025（123）、34247～34293（2101、32709～32781（113）、61626～61781（011）3020130～20162（301）,与绿松石的标准衍射谱线基本致。红外光谱测试分析表明：3510～3465cm。间的谱带归属绿松石0（OH）的伸缩振动,3300～3070cm’间的谱带归属为绿松Nu（M-H。O）伸缩振动,1210-1012cm’间的谱带归属为绿松石U3口O。）ira缩振动,在838cm。附近的吸收谱带归属为绿松石6（OH）弯曲振动,655-480cm。间的谱带归属为绿松石u4（P04）弯曲振动。拉曼光谱测试分析表明：3466cm’附近的尖锐拉曼谱峰归属于绿松石（OH）基团的伸缩振动所致,宽缓的拉曼谱峰3281cm’~03078cm’归属于绿松石中水合络离子的伸缩振动,798cm’谱峰则是由于OH的弯曲振动所致。     

哀牢山南段长安金矿深部找矿新进展

长安金矿床是"十五"期间云南省重大找矿突破之一。文章介绍了长安金矿床成矿地质背景、矿床地质特征、矿床类型、控矿因素等方面的新认识,提出了矿床主矿体并非受控于中上志留统与下奥陶统之间的加里东期不整合面,而是受控于NNW向陡立的F6断裂破碎带,属于构造破碎蚀变岩型金矿";通过采用TEM+IP物探方法圈定深部低阻、高充电率异常带,并结合成矿地质因素确定深部找矿空间,深部找矿工作获得新突破,扩大了资源∕储量。     

Geochemistry of rare-earth elements in shallow groundwater,northeastern Guangdong Province,China

Shallow groundwater and hot springs were collected from northeastern Guangdong Province, Southeast China, to determine the concentrations and fractionation patterns of rare-earth elements(REE). The results show that the La, Ce and Nd of REEs are abundant in groundwater and rock samples, and the ∑REE contents in groundwater and rock samples range from 126.5 to 2875.3 ng/L, and 79.44 to 385.85 mg/L, respectively. The shallow groundwater has slightly HREE-enriched PAAS-normalized patterns. However, the granitic rocks PAAS-normalized patterns, with remarkable negative Eu anomalies, are different from that of shallow groundwater. The enrichment of HREE is considered to be controlled by REE complexation and readsorption for most groundwater has Ce and Eu positive anomalies. The Ce and Eu anomalies in groundwater are controlled by redox conditions. Moreover, the Fe-contain sediments dissolution and/or the reduction of Fe oxyhydroxides are another factor contributing to Ce anomalies. The Eu anomalies in groundwater are controlled by the preferential mobilization of Eu2+ during water-rock interaction compared to Eu3+.     

川南煤田古叙矿区煤层气勘探选层的探讨

川南煤田煤炭资源占四川省煤炭资源的60％以上,评价的煤层气资源最占80％以上。通过煤炭资源勘查、煤层气参数外资料分析,认为将龙潭组全段作为一个目的层段研究,将有助于全方位客观评价四川省煤层气的勘探开发前景。根据煤层间距小、储层参数差异小、含气量高等条件提出了以C12-C14、C15-C21、C23-24C、C25煤层群（组）作为目的煤层的观点,并提出必须加大施工排量、多打铺垫液、提高加砂浓度的压裂改造等建议,以期对南方小盆地多煤层的煤层气开发提供新的思路。