莱芜市钢城区国土资源执法监察工作现状及建议

随着卫片执法检查的逐步深入,钢城区在执法监察方面做出了大量的摸索,有效规范了国土资源秩序,但执法监察形式仍不容放松警惕。在总结钢城区执法监察方面基本做法的同时,分析了存在的问题,提出合理化建议。     

贵州铜仁碧江区耕地土壤硒富集分布特征及影响因素研究

硒是重要的人体必需微量元素,对特色农业发展起着重要的助力作用。碧江区土壤硒元素含量平均值超过贵州省及全国硒含量均值。富硒耕地面积达29426 8万亩,具有较大的富硒资源开发潜力。成土母岩为炭质页岩所形成的土壤中硒元素含量高于其他类型成土母岩所形成的土壤,强酸性土壤中硒元素含量平均值高于其他酸碱度等级土壤,水田中硒元素含量平均值显著高于旱地、果园、水浇地等其他类型土地。成土母质是土壤中硒元素的主要来源及影响因素,pH值、有机质、土壤质地等理化条件对土壤硒元素有一定影响。     

市县区行政区划图的标准化研究

从市县区行政区划图的编制内容、流程与地图图示方面进行了探讨,为建立市县区行政区划图的标准和制作规范提供了参考。     

济宁城区地面沉降演变规律及经济损失估算方法

济宁城区位于汶泗河冲积平原的前缘地带，孔隙地下水资源丰富，开采量多年来处于超采状态，1988年以来发生了地面沉降。经采取调整地下水开采井布局等措施后，城区地面沉降速率逐渐减小，而沉降漏斗随地下水的开采向城区北部、东北部转移，地面沉降值大于60mm的范围达到了145km^2证实地面沉降的发生完全受控制于地下水的开采程度。根据济宁市地面沉降的危害程度和破坏性，可将其造成的经济损失分为直接和间接经济损失，其中间接经济损失为全部经济损失的75％以上。     

Geochemistry of groundwater,Burdwan District,West Bengal,India

Hydrogeochemical investigations are carried out in the different blocks of Burdwan district, West Bengal, India in order to assess its suitability for drinking as well as irrigation water purpose. Altogether 49 representative groundwater samples are collected from bore wells and the water chemistry of various ions viz. Ca²⁺, Mg²⁺, Na⁺, K⁺, CO₃²⁻, HCO₃⁻, Cl⁻, SO₄²⁻ and NO₃⁻ are carried out. The chemical relationships in Piper and Gibbs diagram suggest that the groundwater mainly belongs to alkali type and Cl⁻ group and are controlled by rock dominance. A comparison of groundwater quality in relation to drinking water quality standards proves that most of the water samples are suitable for drinking water purpose whereas groundwater in some areas of the district has high salinity and high sodium adsorption ratio (SAR), indicating unsuitability for irrigation water and needs adequate drainage.     

Age and sources of gold mineralization in the Marmato mining district, NW Colombia: A Miocene–Pliocene epizonal gold deposit

Epigenetic gold mineralization occurs in the Marmato mining district, within the Calima Terrain of the Setentrional Andes, Colombia. Regional rocks associated with this mineralization include: graphite- and chlorite-schists of the Arquia Complex; metamorphosed during the Cretaceous, Miocene sandstones, shales and conglomerates of the Amagá Formation; as well as pyroclastic rocks (clasts of basalt, andesites and mafic lavas) and subvolcanic andesitic/dacitic bodies of the Combia Formation (9 to 6 Ma). The subvolcanic Marmato stock hosts mesothermal and epithermal low-sulfidation Au–Ag ores in the form of distensional veins, stockwork, and quartz veinlets within brecciated zones. Ore minerals are pyrite, sphalerite and galena with subordinate chalcopyrite, arsenopyrite, pyrrhotite, argentite and native gold/electrum.Sericitized plagioclase from a porphyry dacite yielded a K–Ar age of 5.6 ± 0.6 Ma, interpreted as the age of ore deposition. This is in close agreement with the age of reactivation of the Cauca–Romeral Fault System (5.6 ± 0.4 Ma), which bounds the Calima Terrain. A porphyry andesite–dacite (6.7 ± 0.1 Ma), hosting the Au–Ag veins, shows a measured ⁸⁷Sr/⁸⁶Sr between 0.70440 and 0.70460, ε_Nd between + 2.2 and + 3.2 and ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios of 18.964 to 19.028; 15.561 to 15.570; and 38.640 to 38.745, respectively. The ⁸⁷Sr/⁸⁶Sr and ε_Nd values of rocks from the Arquia Group range from 0.70431 to 0.73511 and − 12.91 to + 10.0, respectively, whereas the corresponding Pb isotopic ratios (²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb) range from 18.948 to 19.652; 15.564 to 15.702; and 38.640 to 38.885, respectively. ⁸⁷Sr/⁸⁶Sr and ε_Nd values obtained on sulfides from the gold quartz veins, which occur at shallow and intermediate levels, range from 0.70500 to 0.71210 and from − 1.11 to + 2.40. In the deepest veins, ε_Nd values lie between + 1.25 and + 3.28 and the ⁸⁷Sr/⁸⁶Sr of calcite and pyrite fall between 0.70444 and 0.70930. The ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios of all mineralization are in the ranges 18.970 to 19.258; 15.605 to 15.726 and 38.813 to 39.208, respectively. Carbonates have an average ⁸⁷Sr/⁸⁶Sr ratio of 0.70445, which is within the range of values measured in the host dacite. The Sr isotopic data indicate that carbonic fluids have a restricted hydrothermal circulation within the host igneous body, while the Sr, Pb and Nd isotopic compositions of the sulfides suggest that the fluids not only circulated within the Marmato stock, but also throughout the Arquia Complex, inferring that these rocks offer a potential target for mineral exploration. Based on geological and geochronological evidence, the epizonal Marmato gold ores formed during the Miocene to Pliocene, as a result of cooling of the Marmato stock and reactivation along a crustal-scale fault zone related to thermal processes in an accretionary oceanic–continental plate orogen.     

SST-ll重力卫星轨道运动对K波段测距系统的影响

给出了物体作近圆椭圆轨道运动的近似运动学方程,并结合GRACE重力卫星的轨道参数,在没有考虑摄动效应的前提下,计算了双星的距离、相对速度以及双星连线的倾角,并讨论了这些量对K波段测距系统的影响。同时分析表明,2倍轨道频率的效应可望用于K波段测距和测速的在轨性能检验,这对于K波段研究具有一定指导意义。     

巴什布拉克铀矿区遥感油气还原蚀变信息提取

从巴什布拉克铀矿床油气还原蚀变岩石的光谱特征分析入手,开展了基于ETM数据的白垩系油气还原蚀变信息的反向增强和 基于ASTER数据的直接增强技术研究。通过对增强的油气还原蚀变信息分布特征的分析,发现矿床所在的北西西向狭长的白垩系出 露范围内,西段的油气还原蚀变强烈,中段和东段的蚀变弱,从而为矿区外围铀矿找矿提供了重要依据。     

济南市济阳区农用地整理潜力分析

农用地整理潜力作为农用地整理项目选取和项目时序安排的基础,在新形势下的国土空间综合整治规划中有重要的现实意义。本文以济南市济阳区为研究对象,在济阳区耕地质量更新评价成果和2017年济阳区土地利用现状成果基础上,运用arcgis,spss等分析软件,运用统计分析方法分析济阳区数量潜力,运用产能核算方法分析其质量潜力,通过几何平均法对济阳区各乡镇(街道）潜力评价结果进行了分级。结果表明：济阳区平均新增耕地系数为0.28%,共划分为5个潜力区,以二级、三级为主。