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本文回并认真讨论了扇三角洲最初的概念及其新近的变动。作为修改的定义,提出:扇三角洲是由冲积扇提供物质并沉积在活动扇与静止水体分界面处的、全部或大部分位于水下的沉积体。这里把扇三角洲看作是冲积扇实际上的三角洲,强调的是它所处的部位,即:水上与水下环境活动界面处。建议扇三角洲的概念应适用于各种类型的冲积扇,包括“干扇”和“湿扇”,只要它们能动地与湖或湖接触。靠近高地及与构造陡坡伴生是扇三角洲常见和重要的标志,但不是决定性的,而成为扇三角洲概念中的一部分。相标志被认为是在岩石记录中识别扇三角洲的最有用的依据。
This paper goes back and carefully discussed the original concept of the fan delta and its recent changes. As a definition of modification, it is proposed that the fan delta is a sediment that is wholly or mostly submerged by alluvial fans that provide matter and deposit at the interface between the moving fan and the rest water. The fan delta is here regarded as the actual delta of the alluvial fan, emphasizing the location of the alluvial fan, ie the interface between the water and the underwater environment. The proposed fan delta concept should apply to all types of alluvial fans, including “dry fans” and “wet fans,” as long as they actively touch the lake or lake. The common and important symbol of the fan delta, near the highlands and associated with the steep slopes, is not decisive, but part of the fan delta concept. Phase identification is considered as the most useful basis for identifying fan delta in rock records.