共查询到20条相似文献，搜索用时 46 毫秒
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《地质与勘探》2021,(2)
浅层钻探技术是覆盖区化探取样技术研究的新方向。手持钻机是轻便钻机的一种。为了探索手持钻机的化探取样效果,以大兴安岭南部半干旱草原浅覆盖区中的内蒙古拜仁达坝银铅锌矿区作为研究区,采用回转式和冲击式手持钻机开展浅钻化探取样试验,分析该方法相对于常规化探方法的优势。结果表明,与常规土壤化探方法相比,浅钻化探取样轻便高效,样品完整连续,分层清晰,可采集深部样品;冲击式钻机更适用于研究区,可行有效的钻进和取样深度一般小于4 m。通过对比两类钻机的钻进、取样工艺及效果,分析总结两类钻机对于草原覆盖区不同覆盖物的适用性及存在问题,为覆盖区浅钻化探技术和取样钻机的发展和推广提供借鉴和参考。 相似文献
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TGQ-15型轻便取样钻机钻具改进实验及其应用 总被引：1，自引：0，他引：1
结合北京市土壤地质环境情况,改进以钻代槽(浅层钻探技术)。选取TGQ-15型轻便取样钻机,在北京市平原区、山区共开展两种类型改进应用实验,即取样管改进应用实验和取样管外部刻度尺改进应用实验。在河床沉积区、河床一级阶地和山前坡积区,3种不同的区域选择不同的方法采集样品分析测试。结果表明:经过不同材质对比以及样式设计的有机玻璃管用来取样及存储土壤样品是安全的,并且土壤中的重金属含量不会受到影响;通过对3个不同地貌单元的分析评价后得出结论,钻机采取垂直样品过程中,Cu(铜)、Zn(锌)、Pb(铅)、Cr(铬)、Ni、Cd(镉)、AS(砷)和Hg的含量未受影响,其分析评价结果可以反应取样区域的污染状况;经过改进设计的刻度尺,提高了孔深校正的效率和精度,同时便于地质地层的编录。总之,钻机的改进避免了土壤的人为污染,提高了土壤样品质量,同时提高了取样效率。 相似文献
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介绍了TGQ-10A 型浅层取样钻机的主要性能参数、设计思路及应用情况,为后续的浅层取样钻机的设计拓宽了思路,为浅覆盖区的地质填图及浅层取样工作提供了可部分替代槽井探的新选择. 相似文献
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冲击钻进取样是支撑生态地质调查中松散地层优质高效、原状无污染取样的有效手段,但目前常见的便携式冲击取样钻机采用汽油机驱动,不能较好地适应安全生产与绿色勘查的发展要求。鉴于此,本文研制了一种以锂电池作为动力源的便携式电动冲击取样钻机及配套工具,详细介绍了钻机的电动冲击器、控制器、锂电池动力源及配套的取样器、锂电池液压起拔器的设计选型过程,并开展了钻机取样试验。实践证明该钻机及配套工具轻便可靠,可以实现5 m以浅松散地层的安全、高效、零碳排取样,是践行绿色勘查理念、推动浅层钻探装备电动化升级的有益尝试。 相似文献
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通过对土壤放射性调查可以掌握土壤中放射性元素的分布,也可以为环境放射性影响评价提供依据。这些工作对于城市而言,可以保障人们的生活和环境安全。而对于核设施则帮助制定退役、去污策略,以防止放射性污染物向环境迁移,危害环境安全。综述土壤放射性污染水平监测方法,其中取样方法涉及了取样工具要求、分层采样的方法。污染物分析监测方法则具体阐述了用中子活化分析方法研究土壤中的微量元素含量、如何监测土壤特性的方法。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献