什么是浊流沉积?

2025-03-24 06:19:15
推荐回答(1个)
回答1:

浊流从大陆边缘带到深海的沉积,称浊流沉积。这种沉积,目前在许多海区均有发现。浊流沉积的最典型特征是具有递变层理,即在一个小沉积层中(数厘米厚)较粗的物质在层底,较细的物质在上部,逐渐变化。这种层理的出现,是由于浊流携带大量泥沙(不同粒级的),当流速减慢时,先沉积粗粒物质,在流速逐渐变缓过程中沉积物也由粗变细。浊流沉积的另一显著特征是含植物碎屑、浅水生物遗体及其他浅水沉积物。如在大西洋中脊附近发现有来自巴西海岸的砂,被认为是浊流搬运来沉积的。浊流沉积的沉积速率很大,它是形成大陆基的主要沉积物。浊流沉积的碎屑成分是石英、长石、海绿石、云母和植物碎片。识别浊流沉积的主要标志是:地层中同时具有深海、浅水的化石并呈有规律的泥、砂互层。

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