麻粒岩相区地质研究现状及评述

构成世界各大陆基底的前寒武纪高级变质区或称麻粒岩相区,是下部地壳的代表。它的研究不仅具有实际意义(赋存有大量矿产),而且具有极大的理论价值。因而对这一课题的研究已成为各国地质界的热门。当前,对这一领域的研究主要集中于以下几个方面:①前寒武纪麻粒岩相区以及下部地壳的性质及其组成;②麻粒岩相的形成条件和机制,温压条件测定方法的选择;③麻粒岩相区变质流体的性质及其作用;④下部地壳的地球化学研究;⑤麻粒岩相区地质学和岩石学研究及它们的动力学模拟(P-T-t轨迹)。

A PRESENT STUDY AND COMMENT ON GRANULITE FACIES TERRENE

Precambrian high grade terrene(granulite facies terrene), consisting of all continental shields (basements) in the world,are the representatives of lower crust. The study on it has not only practical significances,but also great theoretical values. It performs a promotive function to know and understand the early history of the earth, the formation and distribution of mineral resoureces.Therefore this problem has been a lot geological topic.Owing to the complexity of geologial evolution and the particularity of tectonic environment and the unreversity of crust evolvement in granu-lite facies terrene, we have been faced with a lot of difficulties.So comprehensive means and cooperative manner of learning branches must be adopted in our study.Nowadays the following aspects are mainly discussed in this field.1. The nature and constitution of the precambrian granulite facies terrene,2. The study and application of geothermometer and geobarometer,3. The nature and furction of metamorphic fluid in granulite terrene,4. Geochemical study lower crust,5. Event research and dynamic simulation (P-T-tpaths)What is discussed above is important for us to grasp the new trend of granulite facies terrene and to deepen the study in the similar terrene in China.