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以江西岩背含黄玉花岗岩的围岩钾长流纹斑岩及其蚀变产物为研究对象，根据蚀变岩和其原岩之间化学成分及稀土元素含量差异，以及包裹体和Ｏ，Ｓ同位素资料，认为蚀变热液是来自含黄玉花岗岩浆的富含Ｆ，Ｃｌ和金属元素Ｓｎ，Ｃｕ，Ｆｅ，Ａｌ，Ｃａ，并含有ＲＥＥ的流体．蚀变岩中Ｅｕ的相对富集系数最大，反映了Ｅｕ相对其它ＲＥＥ更易进入流体，岩浆结晶后期释放的这种富氟流体可能是导致岩背花岗岩强烈Ｅｕ亏损的主要因素之一。
In this paper, the porphyry K-type porphyry of porphyry and its alteration products from the rock-hosted topaz granite in Jiangxi Province are studied. According to the difference of chemical composition and REE content between the alterated rock and its original rock, and the relationship between the inclusions and O, S Isotopic data suggest that the alteration hydrothermal fluid is derived from the F, Cl and metal elements Sn, Cu, Fe, Al, Ca and contains REE containing topaz magma. The relative enrichment coefficient of Eu in altered rocks is the largest, which indicates that Eu is easier to enter the fluid than other REEs. The fluorine-rich fluid released in late stage of magma crystallization may be one of the main factors leading to intense Eu depletion in rock-dunitic granites.