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地质论评  2003 

分叉波痕在广西上泥盆统钙质浊积岩中的发现及意义

Keywords: 小型不对称分叉波痕广西泥盆系钙质浊积岩碳酸盐定量水深集群绝灭沉积岩牙形石动物群

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Abstract:

小型不对称分叉波痕(简称分叉波痕)发现于桂林杨堤剖面上泥盆统弗拉斯阶linguiformis牙形石带,桂林碳酸盐台地东南缘斜坡相钙质浊积岩鲍马序列C段。波长7.5~8.0cm,波高0.5~0.8cm,波痕指数15~10;向流面长5.0~7.0cm,背流面长2.5~4.0cm,波痕对称指数2.0~1.8;背流面向东倾;波脊较圆滑、缓曲,且具明显的分叉现象。是浊流流速减缓,密度流转化为牵引流后在低流态条件下,并叠加有推进型风暴浪作用形成的复合成因波痕。根据该波痕和寄主地层特征,推断含分叉波痕的阳朔碳酸盐盆地的最大水深约100m,极限水深小于200m。这一估计值应能代表广西乃至华南板块泥盆纪广泛发育的含牙形石动物群和钙质浊积岩碳酸盐沉积盆地的定量水深,可能也代表了弗拉斯阶一法门阶之交受集群绝灭事件重创的浅水海相生物与基本未受影响的深水海相生物的水深分界线。

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