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地球学报  2006 

赣中变质岩带地质地球化学演化特征

DOI: 10.3975/cagsb.2006.01.05

Keywords: 赣中变质岩带,元素地球化学,同位素地球化学,结晶基底,褶皱基底

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Abstract:

赣中变质岩带由结晶基底和褶皱基底组成。从结晶基底→褶皱基底,变质泥质岩类SIO2含量降低,AL2O3含量增加;变粒岩、石英片岩、硅质岩SIO2含量显著升高,AL2O3含量显著降低;NA2O含量显著降低,K2O的含量有明显的升高,NA2O/K2O值呈显著的降低趋势;FEO、MGO、TIO2及全铁含量(FE2O3FEO)呈降低的趋势,但FE2O3升高,FE2O3/FEO值显著增高。铁族元素TI、V、CR升高,MN、CO、NI降低;亲铜元素ZN显著升高;大离子亲石元素LI、RB、SR显著降低,U、TH、BA显著升高,SR/BA值急剧降低;LA、CE、YB、NB、Y元素升高;稀土总量、轻稀土含量、轻重稀土比值、轻重稀土相互分离程度、EU亏损程度增加,说明它们原岩沉积环境的差异性,但它们的重稀土含量、LA/CE值、SM/ND值变化很小,稀土配分曲线相互平行反映它们源区岩石的一致性及继承性。从结晶基底→褶皱基底,岩石的ΕND(0)、(~(206)PB/~(204)PB)I、(~(207)PB/~(204)PB)I、(~(208)PB/~(204)PB)I值由低→高;地壳趋于成熟,结晶基底形成于岛弧环境,褶皱基底形成于活动大陆边缘环境。

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