伊犁盆地南缘局部排泄源对铀成矿的影响
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摘要
局部排泄源是地下水的局部泄水天窗,其成因大致可分为两类,一类是产生于构造动力的泄水天窗,另一类是由承压含水层顶、底板隔水层沉积缺失而引起的泄水天窗。在分析区域地质背景的基础上,结合遥感影像资料,分析了研究区因构造动力而产生的局部排泄源的分布特征。分析了局部排泄源对水动力条件、层间氧化带、铀矿体的空间定位关系等的影响。局部排泄源缩短了地下水的径流距离,对铀成矿有利。研究区隐伏性承压层间水排泄源对层间氧化带、地下水水文地球化学特征及矿体的定位均产生了较大的影响。构造动力成因的局部排泄源本身就是一把双刃剑,它既能助推铀矿带发育形成,也会对已形成的古矿床造成毁灭性的破坏。
Local discharge source is the drainage skylight of groundwater. The causes can be roughly divided into two categories,one kind of drainage skylight is produced in the tectonic dynamics,another kind is caused by sedimentary gap of the top or bottom of the confined aquifer. Based on the analysis of regional geological background,combined with the remote sensing image data. Analyzes the distribution characteristics of the local discharge source generated by the tectonic dynamics. The effects of local discharge source on hydrodynamic condition,interlayer oxidation zone and the orientation of uranium ore body. Local discharge source shortens the runoff distance of groundwater,which is favorable for uranium mineralization. In the study area,the buried water discharge of confined water between layers has a great influence on the interlayer oxidation zone,the geochemical characteristics of the groundwater and the orientation of the ore body. Local discharge source caused by tectonic dynamics is a double- edged sword. It can promote the formation of uranium ore belt,and can also cause devastating damage to the ancient deposits has been formed.
Local discharge source is the drainage skylight of groundwater. The causes can be roughly divided into two categories,one kind of drainage skylight is produced in the tectonic dynamics,another kind is caused by sedimentary gap of the top or bottom of the confined aquifer. Based on the analysis of regional geological background,combined with the remote sensing image data. Analyzes the distribution characteristics of the local discharge source generated by the tectonic dynamics. The effects of local discharge source on hydrodynamic condition,interlayer oxidation zone and the orientation of uranium ore body. Local discharge source shortens the runoff distance of groundwater,which is favorable for uranium mineralization. In the study area,the buried water discharge of confined water between layers has a great influence on the interlayer oxidation zone,the geochemical characteristics of the groundwater and the orientation of the ore body. Local discharge source caused by tectonic dynamics is a double- edged sword. It can promote the formation of uranium ore belt,and can also cause devastating damage to the ancient deposits has been formed.
引文
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(1)张占峰,蒋宏,李家金,等.2009.新疆察布查尔县蒙其古尔铀矿床P0~P31线详查地质报告[R].核工业二一六大队.
(2)师志龙,王新华,段新生,等.2006.新疆察布查尔县扎吉斯坦-洪海沟地段铀矿预查报告[R].核工业二一六大队.
康勇,王冰.2010.伊犁盆地南缘蒙其古尔铀矿床越流补给成矿作用[J].新疆地质,28(3):317-318.
康勇,王冰.2012.伊犁盆地南缘中西段水动力特征与铀成矿关系[C]//全国铀矿大基地建设学术研讨会论文集(上):464-469.
李学礼.1988.水文地球化学[M].北京:原子能出版社:316-320.
刘杰,聂逢君,侯树仁,等.2013.中新生代盆地砂岩型铀矿床铀矿物类型及赋存状态[J].东华理工大学学报:自然科学版,36(2):107-119.
刘金辉,孙占学,陈功新.2003.公婆泉盆地局部排泄源氧化还原属性与铀矿化关系探讨[J].华东地质学院学报,26(3):221-224.
任满船,李晓红,张全庆.2011.伊犁盆地南缘侏罗系地下水演化及油源分析[J].铀矿地质,27(4):225-230.
孙泽轩.1999.新生代盆地砂岩铀矿局部排泄源、阻水断裂研究[J].四川地质学报,19(3):222-224.
姚振凯,刘翔.2000.中亚独联体五国铀成矿的大地构造背景[J].大地构造与成矿学,24(1):1-8.
张国伟,李三忠,刘俊霞,等.1999.新疆伊犁盆地的构造特征与形成演化[J].地学前缘,6(4):203-214.
(1)张占峰,蒋宏,李家金,等.2009.新疆察布查尔县蒙其古尔铀矿床P0~P31线详查地质报告[R].核工业二一六大队.
(2)师志龙,王新华,段新生,等.2006.新疆察布查尔县扎吉斯坦-洪海沟地段铀矿预查报告[R].核工业二一六大队.