大多数内生金属矿床成矿作用与花岗岩关系密切(Chen et al.,1989;洪大卫,1994),尤其是稀土元素、铀矿床等均与复式岩体晚期岩体(包括浅色花岗岩与伟晶岩)成岩作用关系密切。因此,厘清花岗岩复式岩体演化过程中的稀土元素演化,对认识花...大多数内生金属矿床成矿作用与花岗岩关系密切(Chen et al.,1989;洪大卫,1994),尤其是稀土元素、铀矿床等均与复式岩体晚期岩体(包括浅色花岗岩与伟晶岩)成岩作用关系密切。因此,厘清花岗岩复式岩体演化过程中的稀土元素演化,对认识花岗岩类演化过程中相应金属矿床的成矿作用等方面具有重要的理论意义。根据岩石熔化实验结果,在岩石熔化过程中。展开更多
Although rare earth elements(REEs)in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks,REE distribution patterns during the chemical alteration of zircons need clari...Although rare earth elements(REEs)in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks,REE distribution patterns during the chemical alteration of zircons need clarification.We investigated REE characteristics in zircons with different degrees of chemical weathering through systematic observation of a granodiorite-weathering profile in southeast China.Despite the relatively stable provenance of the studied profile(zircon U–Pb ages are95.2±4.8 Ma),the zircon REEs exhibited systematic differences in abundance and fractionation patterns from the bedrock to upper layers,e.g.∑PREE,(LREE/HREE)_(CN),and Ce/Ce*.This evidence suggests chemical alteration of zircons during intensive chemical weathering and an expected influence on REE variability in the weathered products due to the presence of REE-bearing minerals.展开更多
文摘大多数内生金属矿床成矿作用与花岗岩关系密切(Chen et al.,1989;洪大卫,1994),尤其是稀土元素、铀矿床等均与复式岩体晚期岩体(包括浅色花岗岩与伟晶岩)成岩作用关系密切。因此,厘清花岗岩复式岩体演化过程中的稀土元素演化,对认识花岗岩类演化过程中相应金属矿床的成矿作用等方面具有重要的理论意义。根据岩石熔化实验结果,在岩石熔化过程中。
基金supported by National Natural Science Foundation of China(No.41506058)Open Financial Grant from Qingdao National Laboratory for Marine Science and Technology(No.QNLM2016ORP0211)State Key Laboratory of Marine Geology,Tongji University(No.MG20170402)
文摘Although rare earth elements(REEs)in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks,REE distribution patterns during the chemical alteration of zircons need clarification.We investigated REE characteristics in zircons with different degrees of chemical weathering through systematic observation of a granodiorite-weathering profile in southeast China.Despite the relatively stable provenance of the studied profile(zircon U–Pb ages are95.2±4.8 Ma),the zircon REEs exhibited systematic differences in abundance and fractionation patterns from the bedrock to upper layers,e.g.∑PREE,(LREE/HREE)_(CN),and Ce/Ce*.This evidence suggests chemical alteration of zircons during intensive chemical weathering and an expected influence on REE variability in the weathered products due to the presence of REE-bearing minerals.
