塔里木盆地东河砂岩段中的生物扰动作用

生物扰动作用对沉积过程的影响比较复杂,一般认为生物扰动作用发生在表层细粒泥质沉积物中,如深海海底、河口湾、潮滩等环境下。塔里木盆地东河砂岩段为高能碎屑滨岸沉积,其中含大量的遗迹化石,也发育大量的生物扰动构造,说明高能环境下存在生物扰动的事实。生物扰动强度也是进一步识别各沉积微相的依据,隐性生物扰动作用甚至可以保留原始沉积构造。

Bioturbation of Donghe Sandstone Member in Tarim Basin

The effect of bioturbation to deposition process is complex. It is generally recognized that bioturbation exists in surface granular mud sediments, such as the deep sea beds, estuary bays, tidal flats and other conditions. Donghe sandstone member in Tarim basin was deposited in high-energy shore clastic sedimentary environment. The numerous trace fossils and a large number of bioturbation structures may state the fact that there exists bioturbation in high-energy environment. The intensity of bioturbation has further become the evidence of identifying the sedimentary microfacies and the crypto-bioturbation can always reflect the original sedimentary structure.