川东北元坝地区长兴组生物礁的分布与控制因素

四川盆地东部地区吴家坪末期形成的开江—梁平陆棚古地貌与长兴期的持续海侵背景共同控制了该区长兴组生物礁的生长形态及分布规模。首先对该区长兴期生物礁进行了分析,揭示其分布特点以及所具有的退积礁的特点,并对各礁带前缘斜坡进行了研究,推测出礁体所处生长环境各有差异。其次对生物礁的生长环境进行了分析,认识到潮道与海平面变化对早期生物礁生长发育的影响,认为生物礁带中转折增大部位可能对应该时期海平面相对稳定期,整个长兴期海平面总体来说是上升的,到后期则大规模水退。

Bioreef Distribution and Its Influencing Factors of Changxing Formation in Yuanba Area, Northeastern Sichuan Basin

In Wujiaping of eastern Sichuan Basin, the paleogeomorphy of Kaijiang-Liangping continental shelf formed at the later stage and the Changxingian continuous transgression control the growth and distribution of Changxing Formation bioreef simultaneously. In this paper, the Changxingian bioreef is analyzed at first which illustrates the distribution characteristics and a feature of retrograding reef; and then, the frontal slope at every reef zone is studied and the different growth environment for every reef i...