题名: Biomediated Precipitation of Calcium Carbonate in a Slightly Acidic Hot Spring, Yunnan Province
作者: Jiang, Lei1; Xu, Hengchao1; Qiao, Haijun2
刊名: ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期: 2017-02-01
卷号: 91, 期号:1, 页码:145-155
关键词: Bio-mediated ; calcium carbonate ; slightly acidic ; hot spring ; Yunnan Province
英文摘要: A slightly acidic hot spring named Female Tower (t=73.5 degrees 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 SO(4)(2-)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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary
关键词[WOS]: YELLOWSTONE-NATIONAL-PARK ; REHAI GEOTHERMAL-FIELD ; SOUTHWESTERN CHINA ; MICROBIAL MATS ; SP-NOV. ; BIOFILMS ; CACO3 ; SULFURIHYDROGENIBIUM ; CRYSTALLIZATION ; MINERALIZATION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000395768100010
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.idsse.ac.cn/handle/183446/1827]  
Appears in Collections:深海科学与工程研究所_深海科学研究部_深海极端环境模拟研究实验室_期刊论文


作者单位: 1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Hainan, Peoples R China
2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
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