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DOI	10.1016/j.chemgeo.2019.119331
	Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation
	Lu, Xianfu; He, Qiufang; Wang, Zhijun; Cao, Min; Zhao, Jingyao; Jiang, Jianjian; Zhao, Ruiyi; Zhang, Hong
通讯作者	He, QF (通讯作者)
发表日期	2019
ISSN	0009-2541
EISSN	1872-6836
卷号	530
英文摘要	Stable oxygen (delta O-18) and carbon (delta C-13) isotopes of speleothems are widely used as important proxies for paleoclimatic and paleoenvironment reconstructions. However, the influence of microbial activity on carbon and oxygen isotope fractionation during speleothem precipitation remains unclear. Bacterial carbonic anhydrase (CA) can promote calcium carbonate precipitation to catalyze the mutual transformation between CO2 and HCO3-(center dot )CA-producing bacteria (Lysinibacillus sp. strain LHXY2) were separated in the Xueyu Cave, Chongqing, SW China, and used in laboratory and cave in situ models to investigate their influence on the precipitation amount, mineral components, crystal morphology and carbon and oxygen isotope fractionation of CaCO3. A CA activity gradient was applied in the laboratory model by considering various CA inhibitor acetazolamide (AZ) concentrations, which showed that the CA activity could substantially enhance precipitation, alter the mineral components and morphology, and reduce the delta C-13 and delta O-18 values of the CaCO3 formed. Most importantly, the laboratory and in situ model results revealed approximately -7 parts per thousand and -1.4 parts per thousand delta C-13 shifts, respectively, compared to the bacteria-free model results, which indicated that microbial-driven carbon isotopic fractionation can cause great uncertainties in paleoclimate and paleoenvironment reconstructions.
关键词	BACILLUS-MUCILAGINOSUS ASIAN MONSOON MOONMILK DEPOSITS BIOMINERALIZATION SPELEOTHEMS DIOXIDE CO2 SEQUESTRATION EQUILIBRIUM MECHANISMS
英文关键词	Modern speleothem; Microbially induced carbonate precipitation (MICP); Lysinibacillus; Extracellular carbonic anhydrase (CAex); Isotope fractionation
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000499092400004
来源期刊	CHEMICAL GEOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259619
推荐引用方式 GB/T 7714	Lu, Xianfu,He, Qiufang,Wang, Zhijun,et al. Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation[J]. 中国科学院青藏高原研究所,2019,530.
APA	Lu, Xianfu.,He, Qiufang.,Wang, Zhijun.,Cao, Min.,Zhao, Jingyao.,...&Zhang, Hong.(2019).Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation.CHEMICAL GEOLOGY,530.
MLA	Lu, Xianfu,et al."Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation".CHEMICAL GEOLOGY 530(2019).