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Buried trees and basin tectonics: A discussion

机译：埋树和盆地构造：讨论

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摘要

Rooted tree trunks up to 12m tall, buried in growth position, are a feature of Euramerican late Carboniferous Coal Measures. They provide evidence of episodes in which generation of accommodation space, and resultant sediment accumulation, occurred at rates far in excess of the net long-term (cm/kyr) rates for the sections in which they occur; and they do so in a variety of tectonic settings. Episodic, metre-scale, co-seismic subsidence is the likeliest explanation for this phenomenon. Such episodic subsidence is unlikely to be a unique tectonic attribute of Carboniferous Coal Measure basins. Instead, it seems that the trees' morphology and ecology uniquely favoured their preservation as casts in growth position, thus providing a yardstick for the scale and rapidity of the co-seismic subsidence and accumulation. Other epicontinental shallow marine/paralic basins lack this means of gauging of the rate of subsidence, but it is possible that most of them also experienced episodic subsidence events. Such events would explain the capture of records of, for example, high-energy beach deposition and tidal sedimentation. They also suggest the need for a reappraisal of the significance of metre-scale parasequences in both siliciclastic and carbonate rocks.
机译：植根于生长位置的高达12m高的有根树干是欧美晚期石炭纪煤系的特征。它们提供了以下证据：在这些事件中，容纳空间的产生以及由此产生的沉积物堆积，其发生率远远超过了发生它们的区域的净长期（cm / kyr）率。他们在各种构造环境中都这样做。偶发的，米级的，同震的沉降是这种现象的最可能解释。这种偶发性沉降不太可能是石炭系煤系盆地的独特构造属性。取而代之的是，树木的形态和生态学似乎特别有利于树苗在生长位置的保存，从而为同震沉陷和堆积的规模和速度提供了衡量标准。其他陆上浅海/副盆地缺乏这种测量沉降速率的手段，但它们中的大多数也可能经历了周期性沉降事件。此类事件将解释如何捕获例如高能海滩沉积和潮汐沉积的记录。他们还建议有必要重新评估硅质碎屑岩和碳酸盐岩中米级副序列的重要性。

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