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首页> 外文期刊>Facies >Genesis of microbialites as contemporaneous framework components of deglacial coral reefs, Tahiti (IODP 310)
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Genesis of microbialites as contemporaneous framework components of deglacial coral reefs, Tahiti (IODP 310)

机译：作为塔希提岛冰期珊瑚礁同时期框架组成的微比亚石的成因（IODP 310）

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摘要

Deglacial reefs from Tahiti (IODP 310) feature a co-occurrence of zooxanthellate corals with microbialites that compose up to 80 vol% of the reef framework. The notion that microbialites tend to form in more nutrient-rich environments has previously led to the concept that such encrustations are considerably younger than the coral framework, and that they have formed in deeper storeys of the reef edifice, or that they represent severe disturbances of the reef ecosystem. As indicated by their repetitive interbedding with coralline red algae, the microbialites of this reef succession of Tahiti, however, formed immediately after coral growth under photic conditions. Clearly, the deglacial reef microbialites present in the IODP 310 cores did not follow disturbances such as drowning or suffocation by terrestrial material, and are not “disaster forms”. Given that the corals and the microbialites developed in close spatial proximity, highly elevated nutrient levels caused by fluvial or groundwater transport from the volcanic hinterland are an unlikely cause for the exceptionally voluminous development of microbialites. That voluminous deglacial reef microbialites generally are restricted to volcanic islands, however, implies that moderately, and possibly episodically elevated nutrient levels favored this type of microbialite formation.
机译：来自塔希提岛的冰河礁（IODP 310）的特征是同时存在黄藻类珊瑚和微礁石，它们构成礁石框架的80％（体积）。微生物的倾向往往在营养更丰富的环境中形成，这一观念先前导致了这样一种观念，即这种结壳要比珊瑚框架年轻得多，它们形成于珊瑚礁大厦的更深一层，或者代表了对珊瑚礁的严重干扰。珊瑚礁生态系统。正如它们与珊瑚红藻的反复交错所表明的那样，塔希提岛这个珊瑚礁演替的微生物形成于光环境下，在珊瑚生长后立即形成。显然，IODP 310岩心中存在的冰河礁微生物岩并没有受到地面物质淹没或窒息等干扰，也不是“灾害形式”。鉴于珊瑚和微生物在空间上接近发展，由火山腹地的河流或地下水运移导致的营养水平高涨，是微生物不那么大量发育的原因。大量的冰河礁微生物岩通常被限制在火山岛上，但是，这意味着适度甚至可能在营养上升高的营养水平有利于这种微生物岩的形成。

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