FRESH-WATER (PHYTOHERM) REEFS - THE ROLE OF BIOFILMS AND THEIR BEARING ON MARINE REEF CEMENTATION
FRESH-WATER (PHYTOHERM) REEFS - THE ROLE OF BIOFILMS AND THEIR BEARING ON MARINE REEF CEMENTATION
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DOI：
10.1016/0037-0738(92)90014-i
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发表时间：
1992-08-01
影响因子：
2.8
通讯作者：
PEDLEY, M
中科院分区：
文献类型：
--
作者：
PEDLEY, M
在富含碳酸盐的淡水环境中，生物构造通常导致厚的原生凝灰岩矿床的发育。在河流系统中，这些以植物为主的大型淡水礁石框架（植物草本植物）能够阻塞河道，形成湖泊链。由此产生的植物草本植物深刻地改变了其附近的当地环境和沉积模式，并为生物群提供了广泛的生态位。水下边缘胶结物覆盖所有暴露表面。它们结合了短暂的植物框架，提供了一个水泥框架，并赋予生物结构刚性。似球体与这些胶结物的发育密切相关，经常填充在礁内和框架腔内。有证据表明，泥晶边缘胶结物和似球粒都是与原核微植物生物膜和有机碎屑存在相关的生物中介的产物。随后在泥晶边缘和似质体上发育的叶片状低镁方解石条纹可能是较慢形成的无机沉淀。植物植物边缘胶结物和球体与它们的海洋礁相对应物之间的密切形态相似性被认为不仅仅是巧合。有人认为原核-微植物生物膜也对浅光海洋领域的泥晶沉积负责，细菌膜可能将这一过程深入到未光照的礁腔和管道以及深水岩石滩。
Bioconstructions in carbonate-rich freshwater environments generally lead to the development of thick autochthonous tufa deposits. In rivers systems, these large plant-dominated freshwater reef frameworks (phytoherms) are capable of damming the water courses to produce chains of lakes. The resulting phytoherms profoundly modify both local environment and sedimentation patterns in their vicinity and provide a wide range of niches for biota.Subaqueous fringe cements coat all exposed surfaces. They bind the ephemeral plant frameworks, providing a cement framework and give rigidity to the bioconstructions. Peloids are intimately associated with the development of these cements and frequently infil intra-reef and framework cavities.Evidence is presented to suggest that both micritic fringe cements and peloids are the product of biological mediation associated with a procaryote-microphyte biofilm and the presence of organic detritus. The bladed low-magnesium calcite fringes which develop subsequently on the micrite fringes and peloids are possibly slower formed inorganic precipitates.The close morphological similarities between phytoherm fringe cements and peloids, and their marine reef counterparts are considered to be more than coincidental. It is argued that procaryote-microphyte biofilms are also responsible for micritic precipitates in the shallow photic marine realm with bacterial films possibly carrying the process deep into unlit reef cavities and conduits, and deep water lithoherms.