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Biogenetic peloidal micrites within coral skeletons cause geochemical anomalies in reef limestones, Zhongsha Atoll, South China Sea

文献类型：期刊论文

作者Yang, Hong-Qiang1,4,5; Zhang, Xi -Yang4,5; Li, Yue3; Shi, Qi4,5; Tao, Shi-Chen4,5; Mu, Xi-Nan3; Wang, Ming-Zhuang2,5; Liu, Xiao-Ju2,5; Tan, Fei4,5; Zhou, Sheng-Nan2,5
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2023-01-15
卷号610页码:10
ISSN号0031-0182
关键词Mg calcite Peloidal micrite Microbial activity Cement Coral reef Holocene
DOI10.1016/j.palaeo.2022.111337
通讯作者Yang, Hong-Qiang(hqyang@scsio.ac.cn) ; Zhang, Xi -Yang(zhangxiyang@scsio.ac.cn)
英文摘要High-magnesian calcite (HMC) peloidal micrite is a ubiquitous synsedimentary cement observed in abundance in the Holocene cryptic niches of coral intraskeletal pores and borings at Zhongsha Atoll in the South China Sea. In this study, we assessed the petrographic and geochemical effects of these intraclasts during early diagenesis. Peloidal micrites with an average diameter of 20-40 mu m were composed of radially arranged rhombic microcrystals of HMC (similar to 20 mol% MgCO3) and massive micritic nuclei. Some living bacterial/algal clumps in peloidal micrites are associated with bioluminescence and manifest an organic-rich micro-environments. Fragmented calcified cyanobacterial sheaths, which are components of the peloidal nuclei, further enhance biogenetic carbonate precipitation throughout peloidal micrite formation. The stable isotope characteristics of the peloidal microfabrics (average delta C-13 of 2.55 +/- 0.15 parts per thousand and delta O-18 of -1.64 +/- 0.25 parts per thousand) suggest that photosynthesis and heterotrophic decomposition promoted peloidal micrite precipitation by increasing the carbonate saturation. Plentiful peloidal micrites within the intraskeletal pores also influenced the geochemical signatures of the bulk reef limestone. Owing to the presence of mixed HMC peloidal micrites, the delta C-13 and delta O-18 values of the bulk limestone (0.26 +/- 1.04 and-3.82 +/- 1.02 parts per thousand, respectively) were elevated and fluctuated widely compared with pristine coral skeletons (-3.43 +/- 0.48 parts per thousand and - 5.75 +/- 0.278 parts per thousand, respectively). Enriched Mn and depleted Sr contents led to an increase in the Mn/Sr diagenetic proxy. The co-occurrence of HMC peloidal micrites and elevated Mg/Ca, Mn/Sr, delta C-13, and delta O-18 ratios indicate that the HMC peloidal micrites played an essential role in these geochemical variations. We, therefore, propose performing a comprehensive diagenetic evaluation before geochemical analyses of reef limestone. In such cases, selective micro-analysis of pristine areas in altered limestone would yield more robust reconstructions based on corals.
WOS关键词CARIBBEAN FRINGING REEF ; ENVIRONMENTAL SIGNIFICANCE ; SUBMARINE CEMENTS ; GALETA-POINT ; DIAGENESIS ; HOLOCENE ; MICROBIALITES ; CARBONATE ; TAHITI ; GULF
资助项目National Science & Technology Fundamental Resources Investigation Program of China ; Key Technologies Research and Development Program of China ; Guangdong Basic and Applied Basic Research Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences ; [2018FY100103] ; [2021YFC3100603] ; [2022YFC3102402] ; [2021A1515011402] ; [XDA13010103]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
出版者ELSEVIER
WOS记录号WOS:000899503300001
资助机构National Science & Technology Fundamental Resources Investigation Program of China ; Key Technologies Research and Development Program of China ; Guangdong Basic and Applied Basic Research Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.nigpas.ac.cn/handle/332004/41561]  
专题中国科学院南京地质古生物研究所
通讯作者Yang, Hong-Qiang; Zhang, Xi -Yang
作者单位1.Chinese Acad Sci, Nansha Marine Ecol & Environm Res Stn, Sansha 573199, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironment, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
4.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China
5.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		 Yang, Hong-Qiang,Zhang, Xi -Yang,Li, Yue,et al. Biogenetic peloidal micrites within coral skeletons cause geochemical anomalies in reef limestones, Zhongsha Atoll, South China Sea[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2023,610:10.
APA Yang, Hong-Qiang.,Zhang, Xi -Yang.,Li, Yue.,Shi, Qi.,Tao, Shi-Chen.,...&Li, Yue.(2023).Biogenetic peloidal micrites within coral skeletons cause geochemical anomalies in reef limestones, Zhongsha Atoll, South China Sea.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,610,10.
MLA Yang, Hong-Qiang,et al."Biogenetic peloidal micrites within coral skeletons cause geochemical anomalies in reef limestones, Zhongsha Atoll, South China Sea".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 610(2023):10.

入库方式： OAI收割

来源：南京地质古生物研究所

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