REE geochemistry of some metamorphic rock types of the Late Archean Fuping Group and their anatectic derivatives in Pingshan, Hebei Province, China—A preliminary study

Abstract

The Late Archean Fuping Group of the Xiaojiao area in Pingshan County, Hebei Province consists mainly of three metamorphic rock types of supracrustal affinity, i. e., Kfeldspar leucoleptite, biotite leptite-gneiss and hornblendic rocks. Their anatectic derivatives formed in the initial stage of anatexis are petrochemically of K-feldspar granitic, trondhjemitic and granodioritic compositions respectively, and in general have inherited the main petrochemical features from their parent rock types. Probably due to the fact that they contain less REErich accessory minerals as compared with their parent rocks, the anatectic derivatives are in general lower in ΣREE content. But both the derivatives and their parent rocks have similar REE patterns, which serves as an additional indication of the genetic relationship between them.