安徽庐枞盆地砖桥深部钻孔内电气石对铀钍成矿流体在高温阶段的指示意义
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摘要
安徽庐枞盆地砖桥深部钻孔深部(1 500~1 900 m)岩体内存在大量铀钍矿化,局部达到工业品位,为区域铀钍矿床(点)在盆地深部、高温热液阶段的产物。钻孔内存在大量电气石族矿物,电气石经历了生长-溶蚀、交代、再沉积-再生长的过程,可至少划分为3个期次,具有以下特点:①晶体因化学成分不同而呈现不同的颜色、结构;②存在于高温阶段;③由于氧化还原状态、流体成分的改变,化学成分发生Fe-Al、Fe-Mg等置换;④从早到晚的3个期次电气石中Mg含量均较高且相对稳定,Fe3+含量逐渐升高,反映氧逸度逐渐升高。电气石族矿物常在高中温热液矿床内出现,因具有多期次且颜色可随成分不同而异,常认为在找矿和勘察中具有重大意义。深钻内多期次的电气石化揭示了流体早期相对富镁,而后镁、铝含量有所降低,铁的含量相对升高。电气石反映出流体氧逸度逐渐升高和富F、B、H2O等挥发分的特征,这些为U6+的形成和运移提供了环境,反映了铀钍成矿流体在盆地深部高温阶段的演化特征。
        The Deep Drilling Pprogram, namely SinoProbe-03-06, was implemented at Zhuanqiao, Lujiang City, Anhui Province,where thoriumanduraniumanomalieswere found,whichmightindicate ahigh temperature mineralizationstyle of uranium depositin the depthof the basin.Abundant tourmaline-groupmineralswere foundin the core,which couldbe classified into at least three types.The mineralsexhibitsome general features:① sectorandoscillatory chemical zoningof crystals;② formation in high temperature;③ Fe-Al,Fe-Mg coupled substitution;④ high Mg content and evolution of varieties fromAl-rich to Fe3+-rich through Fe-Al coupled substitution caused by the increase of fO2. Tourmalines usually occur in high-temperature hydrothermal deposits and can be taken as efficient indicators for both prospecting and exploration of these important mineral deposits. The study indicates that the fO2of the fluids was rising and the fluids carried plenty of volatile materialssuchasF,BandH2Owith theevolutionof the tourmaline,whichprovidedafavorableenvironmentforthe formationof U6+ and the migrationofsome usefulelements.These dataalsopresentsome constraintsonfeaturesof the fluidsin the deep basin.
引文
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