The REE data in literature for garnet in skarn deposits are compiled to discuss main factors affecting the REE partition. The data shows that the garnet in skarn deposit is mainly grossular-andradite garnet. From the andradite to grossular, the garnet changes from LREE-enriched to HREE-enriched. In the LREE enriched type, with the decrease of andradite, the highest point in REE distribution diagram change from La-Ce through Ce-Pr to Pr-Nd. The statistic data show that the main factor affecting the REE pattern is the major composition of the garnet. The REE pattern of hydrothermal fluid and the other factors have little affection. REE usually enter dodecahedral site in garnet. With the increase of andradite, ideal radius of dodecahedral site increase accordingly, and garnet displays LREE-enriched and HREE-depleted features, for the larger ion radius of LREE than HREE. In the deposit with positive Eu anomaly fluid, most garnet also show positive Eu anomaly. The depletion of oxygen fugacity or increasing of salinity will elevate the Eu positive anomaly. Whereas the crystallization and dissolution of Eu enriched minerals can deplete and elevate Eu positive anomaly in hydrothermal fluid respectively. Then the hydrothermal fluid subsequently affects the garnet Eu anomaly character. As a result, the Eu anomaly of the garnet can be used to trace the salinity and oxygen fugacity of the hydrothermal fluids and the Eu enriched mineral dissolution or precipitation.

通过总结矽卡岩矿床中石榴子石的主、微量成分组成特征, 探讨影响稀土配分特征的主要原因。结果表明, 矽卡岩矿床中石榴子石主要为钙铝?钙铁榴石系列。随着Fe含量减少, 从钙铁榴石富集轻稀土变化为钙铝榴石富集重稀土。随着钙铁榴石含量逐渐减少, 富集轻稀土的石榴石配分曲线最高点从La-Ce移动到Ce-Pr, 再移动到Pr-Nd。石榴子石的稀土配分特征主要受石榴子石主量成分影响, 受热液稀土配分特征及其他因素的影响较小。稀土元素主要进入石榴子石的十二面体位置, 钙铁榴石含量越高, 十二面体的理想半径越大, 石榴子石就越富集离子半径较大的轻稀土, 亏损离子半径较小的重稀土。热液表现为 Eu正异常的矿床中, 大部分石榴子石也表现为Eu正异常。氧逸度降低或盐度升高都可以使热液Eu异常程度升高, 富Eu矿物结晶或分解可以使热液Eu异常程度减小或增加, 由此导致的热液性质变化直接影响石榴子石的Eu异常特征。因此, 石榴子石的 Eu异常可以用于反演热液的盐度和氧逸度, 以及富Eu矿物的结晶和分解等信息。