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汉诺坝新生代玄武岩中丰富的幔源橄榄岩捕掳体,成为透视上地幔的重要窗口,而与橄榄岩相伴随的麻粒岩捕掳体由于数量少,且对它们的注意和研究是不够的.以往我们主要通过出露于地表的太古代麻粒岩相地体了解下地壳,这些麻粒岩都经历过复杂的地质构造与变质演化历史才抬升到地表,相比,被新生代玄武岩捕获快速携至地表的捕掳体麻粒岩其演化历史要简单得多,更能直接反映下地壳性质,因而成为我们探索现今下地壳物质组成和演化的最直接研究对象.这里我们提出的汉诺坝新生代玄武岩中的高温麻粒岩捕掳体,不同于华北克拉通地台区地体麻粒岩,可能具有现今下地壳的组成特点.
The abundant mantle-derived peridotite entrapment in the Hannobaoba Cenozoic basalts has become an important window of the upper mantle. However, due to the small number of entrained granulite entrapments associated with peridotites, attention and research on them Not enough.In the past we mainly through the surface of the Archean granulite facies understand the lower crust, these granulites have experienced complicated geological structure and metamorphic evolution history uplift to the surface, compared to the Cenozoic The basaltic capture of the captive granulite, which is rapidly entrenched to the surface, is much simpler in history and more directly reflects the nature of the lower crust, thus becoming the most direct object of our exploration of the composition and evolution of today’s lower crust. The high-temperature granulite entrapment in the Cenozoic basalts of Hannoba is different from that of the granulite in the North China Craton Datura area and may have the compositional features of the present lower crust.