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本文首次对我国石榴石橄榄岩类岩石进行系统的岩石学和地球化学研究。通过对大别山地区两个不同类型岩体中的石榴石橄榄岩的岩石学、岩石化学、矿物化学和稀土元素地球化学研究,表明这类岩石属钙碱性系列超基性岩;与地幔成分相比,富集易熔元素,亏损难熔元素;利用矿物地质温压计估算其形成压力为2×10~9pa,成岩温度为600～700℃具有正铕异常和轻稀土元素富集特征 推测为地壳下部的超基性岩经深成变质而成。
This article for the first time on China’s garnet peridotitic rocks systematic petrology and geochemistry. Based on the petrology, petrochemistry, mineral chemistry and REE geochemistry of garnet peridotites in two different types of rock masses in the Dabie Mountains, it is shown that these rocks are calc-alkaline series of ultrabasic rocks; Than that of enrichment of fusible elements and loss of refractory elements. It is estimated that the formation pressure is 2 × 10 ~ 9 Pa and the diagenesis temperature is 600 ~ 700 ℃ with the positive europium anomaly and light rare earth element enrichment The ultrabasic rocks in the lower part of the crust are deeply metamorphosed.