摘要
<正>斑脱岩作为一个特殊的事件和时间标志层,在古环境、古地理和古构造分析等方面起到了极其重要的作用。奥陶纪-志留纪火山活动频繁,全球范围内存在大量的斑脱岩沉积记录,国际上对北美和欧洲这一期的斑脱岩年代地层学和地球化学研究成果颇丰,但国内对此研究相对薄弱。鄂尔多斯盆地西南缘甘肃平凉银洞官庄剖面上奥陶统平凉组产出数层斑脱岩,本文对其进行地球化学和高精度同位素年代学研究,探讨源岩性质、构造背景和沉积年代,为华北板块上奥陶统与欧美大陆的地层对比以及
引文
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