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- Title
Ultrastructural Evidence for a Novel Accumulation of Ca in a Microbial Mat from a Slight Acidic Hot Spring.
- Authors
Xiaotong PENG; Huaiyang ZHOU; Huiqiang YAO; Jiangtao LI; Zijun WU
- Abstract
Microbial mats are ecosystems that can control or induce the precipitation of calcium (Ca) carbonate on Earth through geological time. In the present study, we report on a novel accumulation of Ca, together with iron (Fe), in a microbial mat collected from a slight acidic hot spring (pH=5.9) in south China. Combining an array of approaches, including environmental scanning electron microscopy, X-ray microanalysis, transmission electron microscopy, and selected area electron diffraction, we provide ultrastructral evidence for amorphous acicular aggregates containing Ca and Fe associated with cyanobacteria precipitating in the microbial mats. Cyanobacterial photosynthesis and exopolymeric organic matrixes are considered to be responsible for the precipitation of Ca. These amorphous acicular aggregates might imply the early stage of calcification occurring in microbial mats. Ca and Fe coprecipitation indicates another potential important way of inorganic element precipitation in hot spring microbial mats. Our results provide insight into the possible mechanism of cyanobacterial calcification and microfossil preservation in slight acidic hot spring environments.
- Subjects
CHINA; ULTRASTRUCTURE (Biology); CALCIUM; MICROBIAL mats; HOT springs; CALCIUM carbonate; X-ray microanalysis; CYANOBACTERIA
- Publication
Acta Geologica Sinica (English Edition), 2010, Vol 84, Issue 3, p624
- ISSN
1000-9515
- Publication type
Article
- DOI
10.1111/j.1755-6724.2010.00191.x