区域变质作用中岩石的质量迁移和元素活动：以庐山双桥山群变泥？…

依据质量平衡原理，从地球化学组成探讨了庐山双桥山群泥质岩系在区域变质作用过程中岩石的质量迁移和元素活动，结果表明黑云母片岩和（十字）石榴片岩相对于板岩，其质量分别损失了约１７％和２３％，元素Ｓｉ、Ｎａ、Ｋ、Ｒｂ、Ｓｒ有明显的活动迁移，Ａ１、Ｕ、ＲＥＥｓ等地有一定的活动性。岩石质量迁移与元素活动晃区域变质过程中变质流体的结果。

Mass Transfer and Element Mobility of Rocks During Regional Metamorphism--A Case Study of Metamorphosed Pelites from the Shuangqiaoshan Group in Lushan

According to mass balance analysis and their geochemical compositions, the mass transfer and element mobility during regional metamorphism of the pelites of the Shuangqiaoshan Group in the Lushan region are discussed. The results show that the total mass loss values, estimated relative to the low - grade slate using Ti as the immobile reference element, are around 17 % and 23% for the biotite schist and (staurolite) -garnet schist, respectively. The elements Si, Na, K, Rb and Sr have significant mobility while Al, U, REEs etc. are mobile to some degrees during regional metamorphism of the pelites of the Shuangqiaoshan Group. The mass change and the mobility of some elements in question result from the effects of metamorphic fluids on the rocks during the regional metarnorphism.