ITPCAS OpenIR
Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation
Lu, X (Lu, Xianfu)1,2,3; He, QF (He, Qiufang)3; Wang, ZJ (Wang, Zhijun)4; Cao, M (Cao, Min)3; Zhao, JY (Zhao, Jingyao)5; Jiang, JJ (Jiang, Jianjian)3; Zhao, RY (Zhao, Ruiyi)6; Zhang, H (Zhang, Hong)3
Source PublicationCHEMICAL GEOLOGY
2019
Volume530Issue:0Pages:119331
DOI10.1016/j.chemgeo.2019.119331
Abstract

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.

Subject AreaGeochemistry & Geophysics
WOS IDWOS:000499092400004
Language英语
Indexed BySCI
KeywordBacillus-mucilaginosus Asian Monsoon Moonmilk Deposits Biomineralization Speleothems Dioxide Co2 Sequestration Equilibrium Mechanisms
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN0009-2541
Department环境变化与地表过程重点实验室
URL查看原文
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9040
Collection中国科学院青藏高原研究所
Corresponding AuthorHe, QF (He, Qiufang)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100101, Peoples R China;
3.Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China;
4.Chinese Acad Geol Sci, Inst Karst Geol, Key Lab Karst Dynam, MLR & Guangxi, Guilin 541004, Peoples R China
5.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710054, Shaanxi, Peoples R China;
6.Chongqing Jiaotong Univ, Coll Architecture & Urban Planning, Chongqing 400074, Peoples R China.
Recommended Citation
GB/T 7714
Lu, X ,He, QF ,Wang, ZJ ,et al. Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation[J]. CHEMICAL GEOLOGY,2019,530(0):119331.
APA Lu, X .,He, QF .,Wang, ZJ .,Cao, M .,Zhao, JY .,...&Zhang, H .(2019).Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation.CHEMICAL GEOLOGY,530(0),119331.
MLA Lu, X ,et al."Calcium carbonate precipitation mediated by bacterial carbonic anhydrase in a karst cave: Crystal morphology and stable isotopic fractionation".CHEMICAL GEOLOGY 530.0(2019):119331.
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