A Study On The Hydrogeology Conditions Of Sandstone Type Uranimu Mineralization In Erennoer-Bayanwula Area In Erlian Basin

Based on the summary on the study of the uraniuln mineralization hydrogeologicalconditions and uranium mineralization regional geological background whichconducted by the domestic and foreign scholars；and based on the summary ofhydrogeology condition and uranium mineralization geology characteristics inErennuoer—Bayanwula area in Erlian basin，the dissertation deals with the sandstonetype uranium mineralization hydrogeology condition which includes hydrodynamic，hydrochemistry and paleo hydrology．There are two types of uranium deposits in the ore area，oxidation zone type(2083and 2082)and sedimentation—diagnosis type(Nuheting)uranium deposits In thedissertation，the author studied the hydrodynamic field and hydrochemistry fieldaround the two types of uranium deposits．Obtained the confined water head by themethod converting of land static pressure，built the ore area hydrodynamics fieldaround the uranium deposit and analyzed its significance to the uraniummineralization，analyzed and tested the content of the major element，trace element，uranium，hydrogen and oxygen stable isotopes，and researched the distributions ofthese elements in the two types of uranium deposits and analyzed their significance tothe uranium mineralization Based on these works，the author comparatively studiedthe geology and hydrogeology condition ofthe two types ofthe uranium deposit．Combine the results of three aspects：hydrodynamics，hydrochemistry and paleohydrology,we can conclude that in uranium prospecting，we should seek not only theoxidized zone type uranium deposits in runoff flow area，but also thesedimentation—diagenesis type uranium deposits in excretion area．These two types ofuranium deposits have different marks respectively：the Oxidation zone type uraniumdeposits fonned in the transition zones where hydrodynamics change from strong toweak both in horizontal and vertical directions．While the sedimentation-diagenesistype uranium deposits fonned under the weak hydrodynamic condition．The oxidationzone type uranium deposits cowesponded to HC03一and S04。type of groundwater The sedimentation—diagenesis type uranium deposits had CI—as the major anion．Theoxidation zone type uranium deposits distributed in sandstone and the sedimentation—diagenesis type uranium deposits in mudstone．Infiltration water is themain water that WOrked on the oxidation zone uranium mineralization While thesurface water in the same period was the most effective in sedimentation—diagenesistype uranium．The indirect marks in hydrological geochemical prospecting of the twotypes uranium deposit has several differences．In addition，it is believed that organiccarbon is one of the main hydrology elements that control the oxidation zone uraniummineralization，speculated that oil water maybe flow into the Nuheting deposit．Favorite hydrodynamic condition for uranium mineralization，relationship betweenorganic carbon in groundwater and uranium mineralization，trace elements andhyarogeochemieal index elements indicate the location of uranium ores in thedissertation are new cognitions in the study of the sandstone type uranium in thesediment basin，and this would enrich the theory and method for the function of thegroundwater,and also provided technical method and theoretical basis for theprospecting work in the other areas in Erlian basin and other similar area．...