Mercury, arsenic, antimony, bismuth and boron as geochemical indicators for geothermal areas

From 1982 to 1983, 131 soil samples were collected within an area of 60 km² in known geothermal field and their vicinities in Tengchong, Yunnan Province. Distinct anomalies of Hg, As, Sb and Bi were found on the known geothermal fields. The contour of the multiplicative anomaly of Hg × As × Sb encircled the two known geothermal fields, Reshuitang and Rehai, within its extent, disclosing the interrelation between these two fields, and enlarging their future prospects. The B anomaly is related to structural features. Significant correlations among Hg, As and Sb are shown by correlation analysis. It was concluded that a geochemical survey with a density of two samples per km² could be carried out effectively to delineate promising targets of geothermal resources.     

鄂尔多斯盆地北部东胜地区侏罗系—白垩系钻孔数据库与三维地质模型

随着砂岩型铀矿找矿工作的进一步开展,其对以往钻孔资料集成应用的需求尤为迫切。在煤田钻孔资料“二次开发利用”和“煤铀兼探”新方法、新思路的指导下,通过采集东胜地区钻孔资料属性数据,按照统一的标准和要求,将煤田、铀矿等类型的重要钻孔资料,通过整理、扫描、数据类型转换、录入和集成,建成了东胜地区侏罗系—白垩系综合钻孔数据库,实现了对多源钻孔数据的统一管理。该数据库共包含3个Access数据库和相应的成果图件。每个Access数据库均包含钻孔基本信息表、综合柱状分层表、岩性描述分层表、地层名称及代号表、地层颜色表、测井曲线数据表、测井曲线配置表和钻孔弯曲度测量数据表等8张数据表,分别详细记录了地质编录岩性信息、地层分层信息、岩石颜色信息、测井曲线信息、水文分层信息、钻孔样品采样信息、弯曲度测量信息等。通过应用实践,该钻孔数据库成果可实现连井剖面、含煤含铀目的层的顶底板标高、地层等厚图、砂体等厚图及含砂率图等重要基础地质图件的快速生成,从而提高数据的使用效率并为铀矿勘查及研究工作提供重要数据基础。     

鄂尔多斯盆地南缘黄陵地区煤铀兼探钻孔数据集成与三维地质模型构建

鄂尔多斯盆地南缘黄陵地区铀成矿前景良好。中国地质调查局在该地区组织实施了含铀岩系三维地质调查工作,以寻找可地浸砂岩型铀矿找矿靶区为目标,采用“煤铀兼探”、“油铀兼探”的新思路,对煤田钻孔资料进行“二次开发利用”,开展勘查选区研究,完成了354口煤田钻孔（其中筛选出潜在砂岩型铀矿（化）孔49口）和21口铀矿验证钻孔（其中工业矿（化）孔16口）的数据采集建库,在此基础上建立了专题成果图集及三维地质模型。该数据库主要由含铀岩系地层厚度等值线图、砂体厚度等值线图、顶底板埋深等值线图、含砂率等值线图、放射性异常等值线图等专题成果图集和三维地质结构模型组成,为铀矿勘探开发提供了有利支撑和服务作用。     

城市大气气溶胶的物理化学特性及其对人体健康的影响

根据在北京、重庆、上海等城市大气气溶胶的观测结果和气溶胶中有机化学成分的有关资料,分析城市地区大气气溶胶的浓度、尺度谱分布、日变化规律及其化学成分的谱分布特征,并与干净地区的结果作比较,进而探讨了大气气溶胶对人体健康的影响。     

Chemical Analysis of Water and the Resource of Br,K Prospects of Oilfield Brines from Ordovician and Carboniferous in Tarim,China

正China is lack of bromine and potassium seriously.Oilfield brines is the headline goal of bromine and potassium resources exploration.Applicants grab 24oilfield brines samples from various wells of Ordovician     

作物生长岩-土环境中不同存在形态钾素含量动态变化

以较系统的观测资料,对土壤环境中的缓效态、速效态、水溶态钾素含量的动态变化进行探索.结果表明,缓效态钾的季节性动态变化制约着速效态、水溶态钾的季节性动态变化,但是后两者变化幅度较缓效态钾的大;这种动态变化同时受土壤类型和深度的影响.     

Geochemical Characteristics,Origin, and Evolution of Ore‐Forming Fluids of the Khut Copper Skarn Deposit,West of Yazd in Central Iran

The Khut copper skarn deposit is located at about 50 km northwest of Taft City in Yazd province in the middle part of the Urumieh‐Dokhtar magmatic arc. Intrusion of granitoid of Oligocene–Miocene age into carbonate rocks of the Triassic Nayband Formation led to the formation of marble and a calcic skarn. The marble contains high grade Cu mineralization that occurs mainly as open space filling and replacement. Cu‐rich sulfide samples from the mineralized marble are also anomalous in Au, Zn, and Pb. In contrast, the calcic skarn is only weakly anomalous in Cu and W. The calcic skarn is divided into garnet skarn and garnet–pyroxene skarn zones. Paragenetic relationships and microthermometric data from fluid inclusions in garnet and calcite indicate that the compositional evolution of skarn minerals occurred in three main stages as follows. (i) The early prograde stage, which is characterized by Mg‐rich hedenbergite (Hd_53.7Di_42.3–Hd_86.1Di_9.5) with Al‐bearing andradite (69.8–99.5 mol% andradite). The temperature in the early prograde skarn varies from 400 to 500°C at 500 bar. (ii) The late prograde stage is manifested by almost pure andradite (96.2–98.4 mol% andradite). Based on the fluid inclusion data from garnet, fluid temperature and salinity in this stage is estimated to vary from 267 to 361°C and from 10.1 to 21.1 wt% NaCl equivalent, respectively. Pyrrhotite precipitation started during this stage. (iii) The retrograde stage occurs in an exoskarn, which consists of an assemblage of ferro‐actinolite, quartz, calcite, epidote, chlorite, sphalerite, pyrite, and chalcopyrite that partially replaces earlier mineral assemblages under hydrostatic conditions during fracturing of the early skarn. Fluids in calcite yielded lower temperatures (T < 260°C) and fluid salinity declined to ～8 wt% NaCl equivalent. The last stage mineralization in the deposit is supergene weathering/alteration represented by the formation of iron hydroxide, Cu‐carbonate, clay minerals, and calcite. Sulfur isotope data of chalcopyrite (δ³⁴S of +1.4 to +5.2‰) show an igneous sulfur source. Mineralogy and mineral compositions of the prograde assemblage of the Khut skarn are consistent with deposition under intermediately oxidized and slightly lower fS₂ conditions at shallow crustal levels compared with those of other typical Fe‐bearing Cu–Au skarn systems.     

轮古西地区前石炭纪古岩溶微地貌特征及刻画

应用印模法,以石炭系区域标志层双峰灰岩底至奥陶系潜山面填平补齐的沉积厚度为标识,恢复了轮古西地区前石炭纪古岩溶地貌。自东向西划分了岩溶台地、岩溶缓坡地和岩溶盆地3类二级地貌单元。应用现代岩溶分类方法,根据微地貌组合形态,对二级地貌作精细刻画,划分了9种三级地貌单元。认为不同的地貌位置,其水动力条件不同,不同类型岩溶地貌的发育特征、古水系排泄和储层充填特征存在着差异性。     

基于MODIS资料的中国东部时间序列空气动力学粗糙度和零平面位移高度估算

空气动力学粗糙度和零平面位移高度是很多气候模型和陆面模式中的重要参数,采用气象学方法推导这两个参数对于大范围长时间序列的计算需要大量长期的野外观测,而遥感方法可以快速经济的提供大范围数据,在本研究中采用形态学模型,以MODIS产品数据作为数据源,计算植被冠层面积指数,估算了中国东部2001-2003年归一化到植被高度的...     

最高最低气温突升突降概念模型预报工具初探

通过数理统计和气候分析的方法,得出百色单站24h最高最低气温突升突降的分布特征,进行区间划分和分型.利用概念模型预报方法进行研究,得出最高最低气温突升突降的概念模型预报工具.