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1.
《Scientia Geologica Sinica》1997,(2)
ＡＷＯＲＫＩＮＧＨＹＰＯＴＨＥＳＩＳＩＮＴＨＥＳＥＣＯＮＤ－ＲＯＵＮＤＳＵＤＹＯＮＵＬＴＲＡＨＩＧＨ－ＰＲＥＳＳＵＲＥＭＥＴＡＭＯＲＰＨＩＳＭＩＮＴＨＥＤＡＢＩＥ－ＳＵＬＵＲＥＧＩＯＮTXＡＷＯＲＫＩＮＧＨＹＰＯＴＨＥＳＩＳＩＮＴＨＥＳＥＣＯＮＤＲＯ... 相似文献
2.
关中平原地下水水位变化规律与影响因素分析 总被引：1，自引：0，他引：1
根据关中平原148个潜水监测点和116个承压水监测点近年地下水统测资料,分析潜水和承压水的地下水水位变化规律。对潜水水位变化规律按照地貌分区进行研究,对承压水变化规律按照各城市集中供水水源地进行研究。分析各区域潜水和承压水的变化规律和影响因素。研究表明:西安市城区南郊和西郊以及咸阳市水位目前处于上升趋势。承压水水位上升幅度较大,潜水也有一定幅度上升。周至户县长安南部一带由于农业发展,承压水和潜水下降幅度较大。研究结果为地下水开采和调节地下水位起到一定的指导作用。 相似文献
3.
渭河白杨水源地环境同位素研究 总被引：1，自引：0，他引：1
本文应用环境同位素（＾１４Ｃ、＾１３Ｃ、＾３Ｈ、Ｄ及＾１８Ｏ）对渭河白杨水源地地下水年龄、运移过程和一些水文地质参数进行了研究。研究结果表明，水源地潜水为现代水补给，氚含量较高，渭河河水对其补给量约占１／２左右；中、深层承压水补给途径较远，＾１４Ｃ年龄分别为距今４０００￣５０００年和７０００￣８０００年。δ＾１８Ｏ值变化不大，说明主要来源于大气降水补给。 相似文献
4.
银川平原属中温带干旱区,蒸发强烈,潜水水质差,承压水是银川市地下水开采的主要水源。通过ArcMap空间分析、传统作图分析、氢氧同位素分析等方法,分析银川地区承压含水层水化学特征及各含水层水化学特征的差异,探讨了承压水水化学分布特征的控制因素。研究表明,潜水和承压水水化学分布特征在水平和垂直方向上均存在较大差异;第一和第二承压水水化学分布特征在水平方向上相似,在垂直方向上存在一定差异。水平方向上,两层承压水水化学特征存在一定分带性,而潜水无明显规律性。两层承压水在靠近西侧补给区溶解性总固体（TDS）较小,阴离子以HCO-3为主,阳离子以Mg2+和Ca2+为主,向东溶解性总固体逐渐增加,在银川断裂附近,阴离子变为以Cl-和SO2-4为主,阳离子以Na+为主。垂向上,由于银川断裂贯穿承压和潜水含水层,且潜水水位高于承压水位,第二承压水可能主要受到更深层地下水沿着断裂的混入作用,第一承压水可能同时受到更深层地下水和潜水的混入,使得在银川断裂附近,部分第二承压水TDS大于第一承压水,且具有更高含量的Na+和Cl-,及更低含量的Ca2+和HCO-3,也有部分第一承压水TDS大于第二承压水,该部分第一承压水中的个别水样TDS大于潜水。由此得出,银川断裂的发育及其对潜水及承压含水层的贯通作用是控制该区地下水水质的一个重要因素。如果承压水继续过量开采,承压水位持续下降,将进一步激发潜水和更深层地下水的混入,从而导致承压水质恶化。因此控制银川区承压水的过量开采,对于承压水资源的可持续利用至关重要。 相似文献
5.
碰撞造山与华南花岗岩及其成矿系列研究的新进展 总被引：7，自引：1，他引：7
碰撞造山与华南花岗岩及其成矿系列研究的新进展ＮＥＷＡＤＶＡＮＣＥＳＩＮＴＨＥＳＴＵＤＹＯＦＣＯＬＬＩＳＩＯＮＯＲＯＧＥＮＹＯＦＧＲＡＮＩＴＥＳＩＮＳＯＵＴＨＣＨＩＮＡＡＮＤＴＨＥＩＲＭＥＴＡＬＬＯＧＥＮＩＣＳＥＲＩＥＳ裴荣富洪大卫（中国地质科学院矿床... 相似文献
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包头平原地下水水循环模式及其可更新能力的同位素研究 总被引：12，自引：3，他引：9
同位素研究表明,包头平原中山前倾斜平原和黄河冲积平原区地下水具有不同的水循环模式。山前倾斜平原中,潜水的补给来源为当地雨水的补给,具有大型冲洪积扇典型的水文地球化学分带特点;承压水来源于补给高程较大的基岩裂隙水,主要通过山前断裂侧向补给。在地下水位漏斗区中,承压水δ^18和^3H浓度较高的现象反映有潜水向承压水的越流补给。黄河冲积平原中,黄河灌溉水入渗补给是该地区潜水的重要来源。相比于承压水,山前平原潜水的更新时间较短,循环速度较快,潜水的更新能力明显大于深层承压水。 相似文献
7.
通过水文地质钻探,抽水试验、样品分析等手段,结合前人资料,查明了乌鲁木齐北部平原内水文地质岩性结构、地下水分布状态,不同富水地段含水层特征参数等,并对地下水水质进行了评价。结果显示:评价区内赋存丰富的第四系松散岩类孔隙水,由单一结构潜水向双层或多层结构潜水、承压水演变。评价区潜水和浅层承压水质量等级为Ⅳ类或Ⅴ类,超标项目主要为硫酸盐、溶解性总固体、总硬度,较深层承压水质量等级为Ⅱ类。评价区浅层的潜水或承压水水质较差,较深层的承压水可作为理想的饮用水源。 相似文献
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《Scientia Geologica Sinica》1998,(1)
ＡＧＥＯＬＯＧＩＣＡＬＳＴＵＤＹＯＮＳＴＯＮＥＡＮＣＨＯＲＳＦＯＵＮＤＩＮＴＨＥＷＥＳＴＥＲＮＣＯＡＳＴＯＦＦＳＨＯＲＥＯＦＣＡＬＩＦＯＲＮＩＡＦａｎｇＡｉｍｉｎ,ＬｉＪｉｌｉａｎｇ,ＬｉｕＸｉａｏｈａｎａｎｄＸｕＷｅｎｌｉＬａｂｏｒａｔｏｒｙｏｆＬ... 相似文献
10.
作为庐枞盆地较早开展勘探工作的罗河铁矿, 矿区揭露的地下水可分为潜水和承压水2类, 潜水表现为弱碱性HCO3--Ca+·Mg2+型水; 区域构造和凝灰岩阻隔了潜水和承压水的水力联系, 承压水以SO42--Ca2+型微咸温水为主, 水化学成分不受外界因素变化影响.离子比例系数和相关性分析说明承压水中主要水化学反应包括硫酸盐矿物溶解和阳离子交换.PHREEQC反向模拟SO42--Ca2+型承压水的成因主要是砖桥组下段次生石英岩中大量硬石膏、石英和水云母的原位溶解; 与此同时, 地下水中沉淀生成了方解石和绿泥石, 石膏溶解的Ca2+离子吸附交换粘土矿物中的Na+离子, 少量黄铁矿还发生了氧化还原反应.分析结果验证了罗河铁矿深部地下水相对封闭, 补给有限, 以静储量为主. 相似文献
11.
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
12.
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
13.
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
14.
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20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
16.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献