云南西邑隐伏铅锌矿地电化学异常特征及找矿预测

为了在云南西邑铅锌矿区外围和深部寻找隐伏铅锌矿,在董家寨矿段开展了地电化学法找矿研究,对铅锌矿石进行了电化学溶解并在已知矿体上开展了地电化学法找矿可行性试验。结果表明:外加电场作用不仅会使铅锌矿发生电化学溶解,同时地电化学法也可将溶解出来的Pb、Zn等成矿离子提取;已知矿体上方同步出现了Pb、Zn、Ge、Ag异常,地电提取的异常值大小为Pb＞Zn＞Ge＞Ag,[JP2]为典型的喷流热水沉积富锗银铅锌矿的地球化学标志;在此基础上,利用地电化学法在西邑董家寨未知区开展了找矿预测,共圈定了5个综合异常区,其中Ⅰ类异常区2个、Ⅱ类异常区2个、Ⅲ类异常区1个,为下一步勘查找矿工作奠定了基础。      

宁夏卫宁北山地区金场子金矿区找矿模型及成矿预测

卫宁北山地区位于北祁连造山带东段,是宁夏境内金多金属矿床成矿条件最好、成矿迹象最多的地区之一,其中金场子金矿是该地区已知最大的金矿床。在归纳该区近年来找矿成果基础上,对金场子金矿床控矿因素、找矿标志和深部矿化规律进行了总结,构建了基于地-物-化多要素的综合找矿模型,并对矿区及外围、深部找矿靶区进行了圈定。研究表明:金场子金矿控矿因素主要为构造和地层,其中控矿构造表现为东西向断裂、北东向断裂及其次生裂隙为主,控矿地层表现为特定的地层层位及岩性组合。赤铁矿-褐铁矿化、硅化、绢云母化、黄铁矿化、黄钾铁矾化等围岩蚀变,Au-Ag-As-Sb化探组合异常以及中电阻率、中-高极化率地球物理异常为该区主要找矿标志。综合控矿因素和找矿标志,构建了矿区金矿综合找矿模型,并以此圈定地表找矿靶区6处,并进一步根据矿化深部变化规律圈定深部找矿靶区3处。通过对矿区及外围靶区开展地球化学剖面测量以及深部靶区钻探工作,验证了此次靶区圈定的合理性,为今后该地区找矿工作起到了很好的示范作用。      

玲珑金矿田东风矿床深部成矿规律及成矿预测

东风金矿床位于玲珑金矿田内,受招(远)-平(度)断裂下盘次级构造控制。中浅部多以石英脉型为主,深部已渐变为蚀变岩型金矿。该文在系统收集、分析以往矿区勘查开发资料基础上,运用井中激电、测井和构造叠加晕研究,首次建立了东风金矿床构造叠加晕理想模式图,圈定物化探异常区。并利用钻孔对少量异常区进行验证,结果表明物化探异常区与实际见矿位置较吻合,预示该区深部具有较大的找矿潜力。     

广西某金矿区勘查地球化学寻找隐伏矿的试验研究

文章介绍广西某金矿区已探明的主要矿段上的两条典型剖面,进行土壤地球化学剖面测量、地电化学测量、土壤中金属活动态测定以及元素垂向分带研究等新方法技术的试验研究,结合矿区的地质条件、含矿地层、控矿构造及矿体的地质特征,对该矿区地下深部含矿性进行评价,探索寻找该类型金矿体的有效勘查地球化学方法与技术.     

北票二道沟金矿综合信息找矿模型

在花岗闪长岩体、构造、次生晕组合异常、物探异常与金矿脉的关系及金矿脉原生晕分带序列等综合控矿信息的分析和统计的基础上,作者总结出岩体倾伏端为二道沟金矿聚集的良好空间场所。在倾伏端范围内的马蹄形环状矿化带中,导矿和容矿断裂锐角交汇区或两组容矿裂隙的锐角复合交汇区为金矿的富集地段。金矿脉原生晕明显表现出Sb、Ag、Bi、Hg头晕组合及Cu、Co、Ni尾晕组合特征。Au、Ag、sb、Pb、Hg5种元素次生晕组合异常与低阻、低磁、高极化或低阻、高磁、高极化物探组合异常吻合。上述影响金矿富集的综合控矿信息的有机组合,构成了二道沟金矿综合信息找矿模型的全部内容。     

河南周庵铂族—铜镍多金属矿地电化学找矿研究

为了更好地研究和解决河南南阳地区寻找隐伏矿的问题,文章有针对性地介绍在该矿区开展地电提取(CHIM)、土壤离子电导率(Con)、土壤热释汞(Hg)等多种新方法找矿预测试验,在测区内共圈出8个地电提取Cu、7个地电提取Ni异常,以及7个电导率异常、11个土壤热释汞(Hg)异常。并结合矿区元素共生组合和成矿作用,在测区内划分了3类4个具有找矿前景的综合异常靶区,其中Ⅰ类靶区1个、Ⅱ类靶区2个、Ⅲ类靶区1个,初步建立了该地区地电化学理想的找矿模型。     

利用地电化学勘探法提取技术在青海拉陵灶火中游铜钼多金属矿区的找矿应用研究

为了研究地电化学提取技术在青海拉陵灶火中游铜钼多金属矿区的找矿应用效果,对矿区内已知剖面进行了方法有效性试验,试验表明在已知剖面上方出现的地电化学异常与已知矿体位置吻合,说明了在该地区应用地电化学提取技术进行找矿预测工作是切实可行的。同时,通过对找矿未知区进行的地电化学研究工作,最终圈定了2处地电化学异常找矿预测靶区,经过后期在预测靶区的钻探工程验证,验证了地电化学提取技术在青海拉陵灶火中游铜钼多金属矿区的找矿预测准确性,有望后期在同类特殊地球化学景观的找矿工作中提供有利的帮助。     

梧州市张屋金矿区地质特征及找矿标志

文章通过对梧州市张屋金矿区地质特征、物化探异常及矿体特征等进行综合分析,在此基础上分析总结张屋矿区矿床成因及其找矿标志,认为其找矿标志包括构造标志、蚀变标志、地球化学异常标志等三个方面,这为该矿区乃至大瑶山地区寻找破碎带蚀变岩型金矿提供参考。     

激电测量在莱西市山后金矿区萌山矿段的应用

激电测量为寻找隐伏金矿的有效地球物理手段。通过在招平断裂带上山后矿区萌山矿段的成功运用,建立了激电测量在招平断裂带上山后矿区萌山矿段寻找隐伏矿资料解译模型,运用找矿模型对深部隐伏矿体是否存在进行判定,取得了良好的地质效果。     

山东牟乳成矿带金青顶矿区三维综合找矿模型的构建及深部预测

探讨山东牟平-乳山成矿带金青顶金矿区成矿元素地球化学场三维分布特征,总结成矿规律,建立三维综合找矿模型,为金矿深部成矿预测提供更为丰富的信息,指导矿山生产与发展方向。针对金青顶矿区深部找矿问题,在全面收集已有地质、矿产资料的基础上,结合野外实地调查,应用三维建模与可视化技术、构造叠加晕及地质统计学理论与方法,构建矿床地质、地球化学场等方面的三维综合找矿模型,将金青顶矿床的预测评价研究拓展到三维空间,揭示了区内成矿地质特征和地球化学异常表征,据此探讨了矿体及地球化学场的三维空间分布规律。并在此基础上,开展了矿区的地质-地球化学综合信息分析与深部预测评价,减少了深部预测的不确定性。矿体三维模型显示,矿体呈现中间宽两端窄的形态,有向深部尖灭的趋势。三维地球化学场分布特征显示,Au、As、Sb、Hg、Cu、W、Sn、Co、Ni元素及组合因子主要分布于矿体浅部,向深部呈现元素场强度下降的趋势;Mo、Bi元素主要分布于矿体深部;Ag、Pb、Zn元素分布较分散,存在多个矿化中心。地质-地球化学三维模型显示,组合因子高得分区域与组合矿物富集区域相符合,Au成矿作用主要发生于矿体浅部,深部成矿作用减弱。应用格里戈良分带指数法求取Ⅱ号金矿体的原生晕垂向分带序列为Sb-Cu-Ni-Au-Sn-W-Hg-As-Co-Ag-Zn-Pb-Mo-Bi,该序列与单一期次成矿垂向分带序列进行对比无明显反常现象,指示Ⅱ号矿体当前开采深度以下成矿潜力不高。研究结果显示,在综合找矿模型指导下,基于三维地球化学空间场晕模型的三维地质、地球化学异常信息的展示、提取与综合分析,可以有效地评价深部成矿潜力,为深部成矿预测研究提供了新思路,有利于指导矿山工作的部署。综合分析认为金青顶Ⅱ号主矿体在-1 200 m以下找矿潜力一般,不宜继续进行大规模的深部探矿。      

ADVANCES IN MEDICO-CHEMICAL GEOGRAPHY IN CHINA

We have made progress in medico-chemical geography as follows: the correlative law of organism with geochemical environment; the geochemico-ecological classification of chemical elements; the types of formative cause of biogeochemical provinces in China; the parabolic correlation between contents of iodine in drinking water and prevalence rate of endemic goiter; the discovery and proof of the low selenium zone in China; the successive discovery of endemic fluorosis of the types of pollution from burning coal, drinking high fluoride tea and high fluoride table salt from the year 1978; the study on chemical geography of schistosomiasis and the compilation of the Atlas of Endemic Diseases and Their Environments in the People's Republic of China.     

临沂市与江苏省四市保障用地做法对比分析

临沂市毗邻江苏省,前者是革命老区,经济欠发达城市,后者则是全国经济发展速度最快的省份之一.经济发展形势的差异使得二者在保障用地的措施做法上产生了差别.文章以江苏省徐州市、宿迁市、南通市和扬州市为例,重点分析了经济发展较快地区化解用地矛盾的做法,并与临沂市作了比较,借以提出了可供经济欠发达地区借鉴的保障发展用地的措施建议.     

综合找矿方法在鲁西地区莱芜高家岭金矿勘查中的应用

高家岭金矿地处鲁西泰莱断陷与鲁村凹陷之间的隆起地带,矿体发育于铜冶店-孙祖断裂上盘下接触面的构造蚀变带中,通过地质、物化探综合技术手段圈定了物化探异常,指导探矿工程的布设,进而发现高家岭金矿,矿体平均品位5.61×10^-6,预测金矿金属量6788kg,达到中型矿床规模,取得了良好的找矿效果。区内综合找矿方法的应用对类似地区金矿的勘查具有借鉴意义。     

试述学校发展电化教育应注意的问题

随着信息社会的发展，新技术和新媒体的出现必然影响学校现代教育的发展。通过阐述发展学校电化教育的应注意的问题，探讨了解决问题的方法。     

山东省烟台市观水镇白垩纪基岩裂隙水供水可行性分析

近年来,由于地下水污染问题加剧,山东省烟台市观水镇生活用水矛盾日益突出,急需寻找优质地下水缓解当地居民用水问题。通过水文地质调查、地球物理勘探、实施探采结合井、抽水试验和水质化验等手段,初步查明了观水镇及附近区域的蓄水构造类型及赋存规律,圈定了优质地下水的富水地段,论证了白垩纪基岩裂隙水供水可行性,为政府相关部门决策、解决村民吃水问题提供科学建议。     

Changes in the small-jellyfish community in recent decades in Jiaozhou Bay, China

We used long term monitoring data to evaluate changes in abundance and species dominance of small-jellyfish (collected with zooplankton net whose bell diameter was less than 5 cm) between 1991 and 2009 in the Jiaozhou Bay, China. Zooplankton samples were vertically towed with conical plankton net from near-bottom to surface, identified microscopically, and mapped in time-space using Grapher 7.0 and Surfer 8.0. Results show that the abundance of small-jellyfish throughout the bay had been increasing during 2001-2009 on average of 15.2 ind./m 3 , almost 5 times higher than that between 1991 and 2000. The occurrence of peak abundance shifted from spring to summer after 2000, and two peaks appeared in spring and summer, respectively, after 2005. Both the abundance and the frequency of blooms of small-jellyfish increased after 2000 in the bay. In addition, the biodiversity of jellyfish has increased significantly in recent years with a change in dominant species. Several new dominant species appeared after 2000, including Rathkae octopunctata in winter, Phialidium hemisphaericum in spring, summer, and autumn, Phialucium carolinae in spring, and Pleurobrachia globosa in summer and autumn, while some previous dominant species throughout the 1990s (Eirene ceylonensis, Zanclea costata, Lovenella assimilis, and Muggiaea atlantica) were no longer dominant after 2000. The abundance of small-jellyfish was positively correlated with the density of dinoflagellates, and the abundance of zooplankton. We believe that the changes in smalljellyfish abundance and species composition were the result of eutrophication, aquaculture and coastal construction activities around the bay. Concurrently, seawater warming and salinity decrease in recent decades promoted the growth and reproduction of small-jellyfish in the bay.     

东营郑南斜坡带砂砾岩体储层微观特征

东营凹陷郑南斜坡带砂砾岩体是古近纪沙四段沉积时期形成的以砂、砾岩为主的近岸水下扇沉积体。储集层岩石结构成熟度和成分成熟度均较低,多为双模态和复模态结构。首先对影响储集层岩石的主要成岩作用进行了描述,分析了该砂砾岩体储集层的孔隙类型和孔隙结构特征。该类砂砾岩体储集层孔隙类型多样,孔隙结构复杂,以中-低孔隙度、低渗透率储层类型为主。     

青岛市城中村土地征用(收)调查

随着全国大部分地区尤其是东部沿海区域城市化发展进入加速期,城区土地资源紧张问题愈发显现。同时城区内大片旧城区和城中村的改造,影响着城市化能否顺利实施,为了破解这一城市发展难题,青岛市国土部门创新思路,探索实施新的城中村土地征用(收)办法,全方位保障被拆迁群众的利益,推动了城市化的顺利实施,促进了社会的和谐和城市经济健康发展。     

Community participation in forest resource management in Nepal

Livelihood of the people in Nepal hills depends much upon forest resources in addition to farming as forest plays a critical role in the well being of the farming households where access to alternative sources, such as energy for cooking, nutrition for animals, materials for fertilizer and constructing materials for shelter, are limited. Thus, the well being of the people in the hills is directly affected by the management of these forest resources. This issue was addressed in this paper by examining the forest resource management practices and its effect on well being of rural people in two different stages in a village lying in the steep hill of Mahabharat Range in the southern hills of Kathmandu valley, Lalitpur District. The main ethnic/caste groups in the villageare Brahmin/Chhetri (high Hindu caste),Magar/Tamang (Tibeto Burmans) and Kami (occupational caste: cobbler). Currently there are four community forest users groups, with mixed ethnic membership, organized to manage the forest resources. The endowments, weak institutional settings, before 1990 helped the Bhramins, Magars and Tamangs to get access into the private forest endowment, which made them easy to get access to the forest resources, mainly fuel wood, fodder and timber in 1990 and enhanced their well beings. But the socially backward Kami could not get benefit from the institutions that existed during that time and had less chance to enhance their well beings. After the set up of different endowments during late 199os, i.e.,hand over of forest management to users groups in line with the concept of community forest,environment to use the forest resources became better for all the groups, along with the management of the forest. This enhanced the well beings of all the groups in the study village. However, the ability of Kami to use the forest resources to enhance their well beings was still lacking behind. The reason was partially due to the difference in endowments carried over from the endowments before 199o, and partly due to their occupational work and location of their settlements.     

RECENT DEVELOPMENTS IN DEBRIS FLOW RESEARCH IN ITALY

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