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北大西洋东北部 Hatton 与 Gardar 沉积堤的早更新统沉积层分属两类不同的深海碳酸盐软泥。前者粗组份含量高,以有孔虫为主;后者明显变细,主要由超微化石组成。生物产率、水深、沉积速率及等深线流活动都有可能影响软泥的类型,但等深线流的改造作用最重要。本文进一步证实沉积堤是等深线流长期作用的产物,并自渐新世形成以来长期保持稳定。
The Early Pleistocene sediments of the Hatton and Gardar sediments in northeastern North Atlantic belong to two different types of deep-sea carbonate slimes. The former crude component is high, mainly foraminifera; the latter is significantly thinner, mainly composed of ultrafine fossils. Biomass productivity, water depth, sedimentation rate and isobath flow activity may affect the type of slime, but the remodeling effect of isobath flow is the most important. This paper further confirms that the sedimentary dike is the product of the long-term action of the isobathic streamline and has remained stable for a long time since the Oligocene formation.