Research on Paleoecology of the Upper Carboniferous (the Qijiagou Formation) Rugose Corals in Urumqi, Xinjiang Uygur Autonomous Region
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摘要:
在准噶尔盆地南缘上石炭统祁家沟组识别出2种生态类型的四射珊瑚动物群。一种是以小型单体无鳞板类型为主的Cyathoxonia动物群；另一种则是以发育鳞板类型为主的Caniniid–Clisiophyllid动物群。认为祁家沟组四射珊瑚动物群生活于中–高纬度地区温带气候条件下火山口周围类似于环礁的环境中。Cyathoxonia动物群生活于相对闭塞但与外海有连通的低能浅水礁湖（潟湖）环境中并且原地保存，Caniniid–Clisiophyllid动物群则生活于环礁向海一侧适于珊瑚生长的礁坪中–高能环境中。后者不断遭波浪侵蚀，在风暴和重力的作用下，沿着环礁陡峭的前缘斜坡以重力流的形式下滑，在正常浪基面之下的低能环境中保存下来。
Abstract:Two ecological types of rugose coral fauna may be recognized in the Qijiagou Formation of the Upper Carboniferous in the southern margin of Junggar Basin. One is the Cyathoxonia fauna dominated by small solitary forms without dissepiments. The other is the Caniniid–Clisiophyllid fauna dominated by large forms with dissepiments. It is considered that the rugose coral fauna from the Qijiagou Formation lived in an atoll–like environment around the crater in a temperate climate of mid to high latitudes. The Cyathoxonia fauna lived in relatively isolated, low–energy and shallow–water lagoons connected to the open sea and was preserved in situ; while the Caniniid–Clisiophyllid fauna lived in mid to high energy reef flat environments, which was favorable for coral growth, on the seaward side of the atoll. The latter was constantly eroded by waves, under the influence of storms and gravity, slid down along the steep foreslopes of the atoll in the form of gravity flows, and preserved in low–energy environments below the normal wave base.
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Key words:
- rugose corals /
- paleoecology /
- atoll /
- late Carboniferous /
- Junggar basin
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