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在柴达木盆地北缘东段,首次从古元古代达肯大坂岩群中发现太古宙麻粒岩,并取得3450Ma Sm-Nd等时线同位素年龄。该麻粒岩以包体产出于元古代变质侵入体中,原岩为拉斑玄武质岩石,其形成于大洋岛弧构造环境,经高温高压麻粒岩相变质作用形成。
Archean granulite was found for the first time in the eastern segment of the northern margin of the Qaidam Basin from the Dayakan-Daban rock complex in the Paleoproterozoic, and the 3450Ma Sm-Nd isochron age was obtained. The granulite is derived from the metamorphic intrusions by means of inclusions. The protolith is tholeiitic basaltic rocks formed in the oceanic arc tectonic setting and formed by high-temperature and high-pressure granulite facies metamorphism.