夹皮沟片麻岩岩石化学特征及其地质意义

赋存了夹皮沟金矿区绝大部分金矿的夹皮沟片麻岩主要由ＴＴＧ质斜长片麻岩及其中拉斑玄武岩质暗色包体组成，岩石化学上呈双峰特征和奥长花岗岩系列演化趋势，ＲＥＥ组成上均显示了较大的Ｅｕ正异常，δＥｕ最高可达４．６，相似于西格陵兰等典型太古代高级变质地体中的双峰式片麻岩，与裂谷型太古代绿岩带中的双峰式钙碱性火山岩有着本质的不同．

Petrochemical Characteristics of the Jiapigou Gneiss and Its Geological Significance

Detailed petrochemical studies show that the Jiapigou gneiss of Jiapigou gold mine iscomposed of TTG grey gneisses and their irregular to lentiform pl-amphibolite melenic enclaves.The major-element contents show obvious bimodality and trondhjemitic series evolution trend,and the chondrite-normalized REE paterns of grey gneiss possess qulie high positive Eu anomalies which can reach as high as 4. 6. The gneiss is very similar to the bimodal gneisses of some typical Archaean high grade metamorphic terrains as. W. Greenland etc., but totally different from the bimodal calcakalic volcanic rocks of rift--type Archaean greenstone belts.