| Biomediated Precipitation of Calcium Carbonate in a Slightly Acidic Hot Spring, Yunnan Province |
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| 作者姓名： | JIANG Lei XU Hengchao QIAO Haijun |
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| 作者单位： | 1 Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, Hainan, China,1 Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, Hainan, China,2 State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
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| 基金项目： | This work was directly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB06060200) and the National Natural Science Foundation of China (grants 41403050). The FIB-milling and high-resolution SEM analyses were performed at the University of Shanghai. The TEM and STEM analyses were conducted at the China Engineering Research and Application Center for Nanotechnology. |
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| 摘 要： | A slightly acidic hot spring named "Female Tower"(t=73.5°C, pH=6.64) is located in the Jifei Geothermal Field, Yunnan Province, southwestern China. The precipitates in the hot spring are composed of large amounts of calcite, aragonite and sulfur. Scanning electron microscopy(SEM) analyses reveal that the microbial mats were formed from various coccoid or rod-shaped filamentous microbes. Transmission electron microscopy(TEM) shows that the intracellular sulfur granules are commonly associated with these microbes. A culture-independent molecular phylogenetic analysis demonstrates that the majority of the bacteria in the spring are sulfur-oxidizing bacteria. In the spring water, H_2S concentration is up to 60 ppm, while SO_4~(2-) concentration is only about 10 ppm. We speculate that H_2S might derive from sulfur-oxidizing bacteria in this hot spring water, leading to the intracellular formation of sulfur granules. Meanwhile, this reaction increased the p H in the micronscale microdomains, which fosters the precipitation of calcium carbonate in the microbial mats. The results of this study indicate that the sulfur-oxidizing bacteria might play an important role in calcium carbonate precipitation in slightly acidic hot spring environments.
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| 关 键 词： | Bio-mediated calcium carbonate slightly acidic ?hot spring Yunnan Province |
| 修稿时间： | 2016/1/19 0:00:00 |
Biomediated Precipitation of Calcium Carbonate in a Slightly Acidic Hot Spring,Yunnan Province |
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| Authors: | JIANG Lei XU Hengchao and QIAO Haijun |
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| Institution: | 1. Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Hainan, China;2. State Key Laboratory of Marine Geology, Tongji University, China |
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| Abstract: | A slightly acidic hot spring named “Female Tower” (t=73.5°C, pH=6.64) is located in the Jifei Geothermal Field, Yunnan Province, southwestern China. The precipitates in the hot spring are composed of large amounts of calcite, aragonite and sulfur. Scanning electron microscopy (SEM) analyses reveal that the microbial mats were formed from various coccoid or rod‐shaped filamentous microbes. Transmission electron microscopy (TEM) shows that the intracellular sulfur granules are commonly associated with these microbes. A culture‐independent molecular phylogenetic analysis demonstrates that the majority of the bacteria in the spring are sulfur‐oxidizing bacteria. In the spring water, H2S concentration is up to 60 ppm, while SO42?concentration is only about 10 ppm. We speculate that H2S might derive from sulfur‐oxidizing bacteria in this hot spring water, leading to the intracellular formation of sulfur granules. Meanwhile, this reaction increased the pH in the micron‐scale microdomains, which fosters the precipitation of calcium carbonate in the microbial mats. The results of this study indicate that the sulfur‐oxidizing bacteria might play an important role in calcium carbonate precipitation in slightly acidic hot spring environments. |
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| Keywords: | Bio‐mediated calcium carbonate slightly acidic hot spring Yunnan Province |
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