Microbialite development patterns in the last deglacial reefs from Tahiti (French Polynesia; IODP Expedition #310): Implications on reef framework architecture
Microbialite development patterns in the last deglacial reefs from Tahiti (French Polynesia; IODP Expedition #310): Implications on reef framework architecture
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塔希提岛最后冰消期珊瑚礁中微生物岩的发育模式（法属波利尼西亚；IODP 探险队）
DOI：
10.1016/j.margeo.2010.10.013
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发表时间：
2010
期刊：
影响因子：
2.9
通讯作者：
P. Deschamps
中科院分区：
文献类型：
--
作者：
C. Seard;G. Camoin;Y. Yokoyama;H. Matsuzaki;N. Durand;E. Bard;Sophie Sepulcre;P. Deschamps
微生物岩在末次冰消期（16- 6 KaBP）生物礁框架中的广泛存在意味着对其发育模式的准确研究对于揭示生物礁结构随时间的演变以及重建生物礁对海平面变化和环境变化的响应具有重要意义。本研究是基于沉积学和年代学分析（14 C AMS测年）的钻井岩心在IODP远征#310“大溪地海平面”连续阶地代表现代大溪地礁斜坡。它提供了一个全面的数据库，调查微生物的生长模式（即生长速率和栖息地），分析它们在珊瑚礁框架中的作用，并重建海平面上升期间珊瑚礁框架结构的演变。大溪地最后的冰消期珊瑚礁由两个独特的生物群落组成：（1）珊瑚藻群落包括7个不同生长型的组合（2）在这些框架的原生腔中发育的微生物群落，在活珊瑚礁表面以下几米（1.5至6米）处，它们严重包裹在珊瑚藻组合中，形成微生物岩壳。测年结果表明，发生了两个不同的世代的微生物岩：“礁微生物岩”的珊瑚藻群落后，在浅水环境中发展了几百年，而“斜坡微生物岩”增长了几千年后，在显着更深的水条件下，珊瑚藻群落消亡后。微生物岩的发育受珊瑚群落的形态和堆积所决定的初始礁框架的原生腔的体积和形状控制。最广泛的微生物岩发育发生在以分支、薄结壳、平板状和坚固的分支珊瑚群落为主的框架中，这些珊瑚群落构建了以高孔隙率（>50%）为代表的松散和开放的框架。相比之下，他们的增长是最小的紧凑的珊瑚框架形成的大规模和厚的结壳珊瑚原生腔产生低孔隙度（~30%），不能主机显着的微生物膨胀。
The widespread occurrence of microbialites in the last deglacial reef frameworks (16–6KaBP) implies that the accurate study of their development patterns is of prime importance to unravel the evolution of reef architecture through time and to reconstruct the reef response to sea-level variations and environmental changes. The present study is based on the sedimentological and chronological analysis (14C AMS dating) of drill cores obtained during the IODP Expedition #310 “Tahiti Sea Level” on the successive terraces which typify the modern reef slopes from Tahiti. It provides a comprehensive data base to investigate the microbialite growth patterns (i.e. growth rates and habitats), to analyze their roles in reef frameworks and to reconstruct the evolution of the reef framework architecture during sea-level rise. The last deglacial reefs from Tahiti are composed of two distinctive biological communities: (1) the coralgal communities including seven assemblages characterized by various growth forms (branching, robust branching, massive, tabular and encrusting) that form the initial frameworks and (2) the microbial communities developed in the primary cavities of those frameworks, a few meters (1.5 to 6m) below the living coral reef surface, where they heavily encrusted the coralgal assemblages to form microbialite crusts. The dating results demonstrate the occurrence of two distinctive generations of microbialites: the “reefal microbialites” which developed a few hundred years after coralgal communities in shallow-water environments, whereas the “slope microbialites” grew a few thousands of years later in significantly deeper water conditions after the demise of coralgal communities. The development of microbialites was controlled by the volume and the shape of the primary cavities of the initial reef frameworks determined by the morphology and the packing of coral colonies. The most widespread microbialite development occurred in frameworks dominated by branching, thin encrusting, tabular and robust branching coral colonies which built loose and open frameworks typified by a high porosity (>50%). In contrast, their growth was minimal in compact coral frameworks formed by massive and thick encrusting corals where primary cavities yielded a low porosity (~30%) and could not host a significant microbialite expansion.
IODP 310 号探险队重建了末次冰消期期间南太平洋的海平面、气候和环境变化
影响因子：
1.2
作者：
Camoin;McInroy;IODP Expedition 310 Scientists including Felis
通讯作者：
IODP Expedition 310 Scientists including Felis
IODP 会议记录，310
DOI：
10.2204/iodp.proc.310.2007
发表时间：
2007
期刊：
影响因子：
--
作者：
Camoin;McInroy;Expedition 310 Scientists including Felis
通讯作者：
Expedition 310 Scientists including Felis