排序方式： 共有6条查询结果，搜索用时 46 毫秒
1
1.
Hana Jir��kov�� Fr��d��ric Huneau H��l��ne Celle-Jeanton Zbynek Hrkal Philippe Le Coustumer 《Hydrogeology Journal》2011,19(8):1545-1562
Climatic instability during the late Pleistocene has been reflected in the pattern of groundwater recharge. This report summarizes palaeoclimate knowledge during the late Weichselian in Europe. During this period the majority of northern Europe was covered by thick ice sheets and permafrost, preventing aquifers from recharging. In contrast, southern Europe was generally free of these palaeoclimatic features. Palaeoclimatic information has been combined with isotope data to better understand the palaeorecharge conditions and recharge timing across the European continent. The 18O and 2H relationship shows latitudinal plus climatic influences. Radiocarbon data show that while southern European aquifers have generally been recharged continuously during the last 40,000 years, northern European aquifers typically show a recharge gap during the Last Glacial Maximum. Areas that underwent continuous recharge during the entire late Pleistocene period can also be distinguished from areas where recharge to aquifers was prevented during the Last Glacial Maximum. Finally, several examples are presented of melt-water recharge or subglacial recharge. The identification of such diversity in the groundwater palaeorecharge in Europe is of great importance for modellers developing management schemes for groundwater resources. 相似文献
2.
Assessment of rigid overlying strata failure in face mining 总被引：2，自引：0，他引：2
Eva Jiránková 《Central European Journal of Geosciences》2010,2(4):524-530
The method of overlying strata failure assessment of extracted seams is based upon the simultaneous assessment of surface subsidence and seismic activity, considering the spatiatemporal progress of mining, depending on the character of the rock mass. The rigid overlying strata failure assessment results in finding whether a failure of the firm overlying rocks occurred or whether a strutting arch was formed over the mined-out area. The practical importance of the overlying strata failure assessment consists in determining the size of the mined-out area at which the com-plete failure of the rigid overlying strata occurred and in the assessment of the current stress condition of the overlying strata failure. The assessment method is applicable in deep mine workings where thick coal seams are being mined by means of the method of longwall mining with controlled caving. The results of this method are used to amend contemporary known methods of rock-burst protection, namely (regarding the use of surface measurements for the evaluation) in overlying strata areas. 相似文献
3.
Jakub Jirásek Lada Hýlová Martin Sivek Janusz Jureczka Karel Martínek Ivana Sýkorová Mark Schmitz 《International Journal of Earth Sciences》2013,102(4):989-1006
The Main Ostrava Whetstone (MOW) is an important lithostratigraphic horizon of the Late Carboniferous sedimentary fill of the late Palaeozoic foreland Upper Silesian Basin. It is the largest and best-identified volcanogenic horizon in the basin, reaching thicknesses of 15.3 m and occupying an area of ca 2,973 km2 and a volume after lithification of 9.24 km3. It consists of volcanic materials transported to the basin probably by an aeolian process. Just after sedimentation, these materials were redeposited a short distance away in a shallow water environment. Granularity corresponds to a range from argillaceous siltstones to fine-grained sandstones. The components are dominated by glass shards replaced by clay minerals (mixed illite–smectite structures) in addition to quartz of volcanogenic and terrigenous origins. Sanidine and a plagioclase close to albite are also present. The sedimentary structures, micro-structures and composition of the MOW indicate variable and dynamic hydrodynamic conditions. The MOW represents a series of flooding events, which could be connected with unusual rainfall. Such major flooding events were most likely induced by volcanic eruptions. The available drill-core log data were used to construct a digital model of the whetstone, which showed an east–west zonality in the thicknesses, with the majority being synsedimentary. CA-TIMS U–Pb dating the volcanogenic zircons yields an age of 327.35 ± 0.15 Ma. The source location of the volcanogenic material is not clear; however, it is presumed to have been located in the west of the Upper Silesian Basin. 相似文献
4.
Matýsek Dalibor Jirásek Jakub Skupien Petr Thomson Stuart N. 《International Journal of Earth Sciences》2018,107(7):2553-2574
International Journal of Earth Sciences - The Žermanice locality represents the best-exposed example of the meta-basaltoid/meta-gabbroic rock type of the teschenite association. It forms a... 相似文献
5.
Jirî Bičák Edwin Budding Jan Novotny P. Hadrava Martin Machacek Jiří Podolsky J. Kleczek 《Astrophysics and Space Science》1985,111(2):419-424
The possibility of the existence, around type-I supernovae, of dust shells which existed before a supernova outburst is considered. None have so far been detected observationally; and any dust around the progenitor radiating in the near infrared would evaporate at outburst. Far infrared observations of the two possible types of progenitor, R Coronae Borealis-type stars and dwarf novae, would be useful to indicate whether there is any dust around them which would survive a supernova outburst. 相似文献
6.
Jiří Jiránek 《Lithos》1982,15(2):85-87
The structural state of monoclinic K-feldspars from the Karlovy Vary granite massif (Czechoslovakia) was assessed on the basis of the height/width ratio of the 131 diffractometric peak. The lowest ‘triclinicity’ corresponds to the eastern margin of the massif and to contact phenomena at the boundaries of the two bodies. 相似文献
1