河南嵩山石秤岩体稀土元素特征及矿源研究

REE Characteristics and Ore Source of Shicheng Rock-mass in Songshan,Henan

石秤岩体是王屋山期岩浆活动形成的碱性岩体,其稀土元素特征为:ω∑REE约为地壳丰度的6.0倍,ωLREE/ωHREE为地壳丰度的近1.5倍,轻重稀土分异程度低,δEu呈强负异常,基本无δCe异常,侵入岩体围岩与稀土、稀有金属矿化体(碱长花岗岩)的稀土元素分布型式基本相似,呈向右陡倾斜线,但碱长花岗岩中稀土总量更高、重稀土相对更为富集。研究结果表明,岩浆和成矿物质最初可能均来源于上地慢的同一岩浆房,具有同源性,并在岩浆上侵过程中不同程度地同化混染了地壳物质。

In ancient Proterozoic, the Shicheng alkaline rock-mass was formed as a result of mag- matic intrusion. As shown by statistical analysis of REE in these rock-masses, the total content of ωREE is nearly6 times as the crustal clarke value, the ratio of ωoLREE/ωHREE is nearly 1.5 times as that of the crust, and the fractionation of LREE and HREE is slight, whereas Eu is strongly depleted, and Ce is not basically depleted. The REE distribution bodiest wall rock are basically similar to the ones of rare matal mineralized pa bo tterns of intrusive dy （alkali-feldspar granites）, all dipping steeply towards the right. Never less ∑REE and HREE are richer in alkali feldspar granites than in magmatite. The results show that the magma and metallogenetic materi- als of these rock-masses might be derived mainly from the same magma chamber in the upper mantle, both of them were homologous, and they assimilated and mixed the crustal materials with different degree during the intrusion of magma.