Insights into microbially mediated cementation in modern beachrock in the Xisha Islands, South China Sea

doi:10.1016/j.palaeo.2022.110904

	Insights into microbially mediated cementation in modern beachrock in the Xisha Islands, South China Sea
	Zhang, Xi-Yang 3,4; Li, Yue 1,2; Sun, Fu-Lin 3,4; Tan, Fei 3,4; Shi, Qi 3,4; Yan, Hong-Qiang 3,4; Wang, Guan 3,4; Yang, Hong-Qiang 3,4
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2022-04-15
卷号	592 页码:10
关键词	Epilithic community cyanobacteria Calcification Mg calcite Beachrock Yongle Atoll
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2022.110904
通讯作者	Yang, Hong-Qiang(hqyang@scsio.ac.cn)
英文摘要	The present paper supplies biological and lithological evidence for the mechanisms of biochemical cementation in modern beachrocks on the tropical Yongle Atoll, Xiasha Islands in the South China Sea. High-throughput sequencing was used to precisely determine the epilithic microbial community in beachrocks. Microscopic mineralogical examination of sedimentary grains further showed complex processes from rapid carbonate precipitation. The results from 18/16 s rRNA diversity examination indicated that green algae and cyanobacteria only occupied a small proportion of the community, albeit they had considerable amounts. The occurrences of Lyngbya (Family Oscillatoriaceae), Calothrix and Dichothrix (Family Rivulariaceae) with light colour may be related to calcified sheaths coated on the living cells. The short rod-like Mg calcite in Lyngbya sheaths and anhedral to euhedral Mg calcite in Calothrix or Dichothrix sheaths were organominerals mediated most likely by photosynthesis of microorganisms with chloroplasts. Different initial crystal patterns were closely related to different cyanobacterial extracellular polymeric substance (EPS) structures. After cell death, these microcrystals were released into the voids and removed by interstitial water. The carbonate seeds scattered all around the particle surface and then began to enlarge the grain size with the degradation of organic matter. Different paths of crystal growth eventually cemented the intertidal grains abiotically or biotically. This case sheds light on cryptic microbially mediated mineralization in beachrock. Even though chemical processes were considerable in the formation of the beachrocks on the modern reef flat, the pervasive microbial geological processes occurred quietly but effectively.
资助项目	Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0206] ; National Natural Science Foundation of China[41506061] ; National Natural Science Foundation of China[41776128] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA13010103] ; National Science & Technology Fundamental Resources Investigation Program of China[2017FY201407] ; National Science & Technology Fundamental Resources Investigation Program of China[2018FY100103]
WOS关键词	GREAT-BARRIER-REEF ; EXOPOLYMERIC SUBSTANCES ; CARBONATE CEMENTATION ; MARINE STROMATOLITES ; CALCIUM-CARBONATE ; PRECIPITATION ; CALCIFICATION ; CYANOBACTERIA ; MATS ; DISSOLUTION
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000793294800001
资助机构	Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Science & Technology Fundamental Resources Investigation Program of China
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/40782]
专题	中国科学院南京地质古生物研究所
通讯作者	Yang, Hong-Qiang
作者单位	1.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 3.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xi-Yang,Li, Yue,Sun, Fu-Lin,et al. Insights into microbially mediated cementation in modern beachrock in the Xisha Islands, South China Sea[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2022,592:10.
APA	Zhang, Xi-Yang.,Li, Yue.,Sun, Fu-Lin.,Tan, Fei.,Shi, Qi.,...&Yang, Hong-Qiang.(2022).Insights into microbially mediated cementation in modern beachrock in the Xisha Islands, South China Sea.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,592,10.
MLA	Zhang, Xi-Yang,et al."Insights into microbially mediated cementation in modern beachrock in the Xisha Islands, South China Sea".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 592(2022):10.