In Situ Analysis of Sulfur Isotopic Fractionation in Deep-Sea Corals Using Secondary-Ion Mass Spectrometry: Insights Into Vital Effects
文献类型：期刊论文
| 作者 | He, Miaohong2; Yu, Xiaoxiao2; Deng, Wenfeng2; Chen, Xuefei2; Peng, Xiaotong1 ; Ta, Kaiwen1; Xu, Hengchao1; Cui, Zexian2; Yang, Qing2; Yang, Yanan2
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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| 出版日期 | 2024-10-01 |
| 卷号 | 129期号:10页码:19 |
| 关键词 | vital effects deep-sea coral S isotopes O isotopes kinetic process |
| ISSN号 | 2169-8953 |
| DOI | 10.1029/2024JG008032 |
| 英文摘要 | Carbonate-associated sulfate (CAS) delta 34S values (delta 34SCAS) are generally assumed to reflect S isotopic composition of paleo-seawater and have been extensively used to reconstruct secular variations in seawater sulfate concentrations during the geological past. However, it has often been documented that delta 34SCAS records are incompatible with seawater sulfur isotopes (20.9 +/- 0.1%, 2 sigma) determined from other archives, such as sulfate evaporites and barite (both of which may also display inconsistencies). A possible explanation for this discrepancy is that delta 34SCAS values can be easily altered by atmospheric sulfate and sulfide re-oxidation. However, the specific influence of biological factors (vital effects, common in biogenic carbonates) on CAS S isotopic composition remains unresolved, particularly at microscale levels. To elucidate these effects on delta 34SCAS, S isotopic profiles were analyzed across two skeletal transects of two modern deep-sea corals (gorgonia) using a novel secondary-ion mass spectrometry method. Strong S isotopic fractionation was observed in calcitic skeletons from the most 34S-depleted center (delta 34S = similar to 19 parts per thousand), increasing outward to a relatively constant 22.5 parts per thousand in gorgonia sp. coral and 21.6 parts per thousand in bamboo coral, suggesting that vital effects are much larger than previous estimated (similar to +/- 1 parts per thousand fractionation from seawater). Oxygen isotopic and Mg, S, O elemental compositions, and Raman spectral and crystal morphological features indicate that processes such as pH control, Rayleigh fractionation, and organic effects are precluded as causes of such fractionation. Instead, vital effects associated with kinetic processes related to surface entrapment seem plausible as controls on S isotopic fractionations in the coral. This novel method is significant for gaining insights into vital effects, assessing the reliability of biogenic carbonates as high-resolution environmental archives of S isotopes, and understanding the fundamental mechanisms governing biomineralization. The delta 34S values of carbonate-associated sulfate (CAS) serve as crucial indicators of past environmental conditions, providing insights into historical variations in seawater sulfate and atmospheric oxygen levels. It is commonly assumed that delta 34SCAS closely reflects seawater sulfate, except for severely altered samples. However, analysis of S isotopic profiles across two skeletal transects of modern calcitic deep-sea corals (gorgonia sp. coral and bamboo coral) using a newly developed in situ method based on secondary-ion mass spectrometry, reveals significant isotopic fractionation. The most 34S-depleted center (delta 34S = similar to 19 parts per thousand) increases outward to a relatively constant value of 22.5 parts per thousand for gorgonia sp. coral and 21.6 parts per thousand for bamboo coral. These findings suggest that vital effects play a notable role in delta 34SCAS fractionation, challenging the previous consensus of similar to +/- 1 parts per thousand. Further investigation, incorporating multiple indices and skeletal delta 18O, indicates that vital effects associated with kinetic processes related to surface entrapment contribute to this fractionation. These insights shed light on the processes driving S-O isotopic fractionation in biogenic carbonates, bolstering their utility in reconstructing paleo-oceanographic conditions. Development of in situ carbonate S isotopic analysis using secondary-ion mass spectrometry Commonly observed anomalous low delta 34S and delta 18O values in the axial skeleton of deep-sea gorgonia corals Contribution of kinetic-associated vital effects to significant Carbonate-associated sulfate sulfur isotopic fractionation, supported by multiple geochemical indices |
| WOS关键词 | CARBONATE-ASSOCIATED SULFATE ; INORGANIC CALCITE FORMATION ; TRACE-ELEMENT ; CA-44/CA-40 FRACTIONATION ; EQUILIBRIUM FRACTIONATION ; BIOLOGICAL CARBONATES ; GROWTH-RATE ; PH CONTROL ; OXYGEN ; SEAWATER |
| 资助项目 | The National Natural Sciences Foundation of China[42273012] ; The National Natural Sciences Foundation of China[42303012] ; National Natural Sciences Foundation of China[2022SZJJZD-02] ; Director's Fund of Guangzhou Institute of Geochemistry, CAS[202102020250] ; Science and Technology Program of Guangzhou, China |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001321017000001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | The National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Director's Fund of Guangzhou Institute of Geochemistry, CAS ; Science and Technology Program of Guangzhou, China |
| 源URL | [http://ir.idsse.ac.cn/handle/183446/11583]  |
| 专题 | 专家咨询委员会 深海科学研究部_深海地质与地球化学研究室 |
| 通讯作者 | He, Miaohong; Xu, Hengchao |
| 作者单位 | 1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 2.Chinese Acad Sci, CAS Ctr Excellence Deep Earth Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Miaohong,Yu, Xiaoxiao,Deng, Wenfeng,et al. In Situ Analysis of Sulfur Isotopic Fractionation in Deep-Sea Corals Using Secondary-Ion Mass Spectrometry: Insights Into Vital Effects[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2024,129(10):19. |
| APA | He, Miaohong.,Yu, Xiaoxiao.,Deng, Wenfeng.,Chen, Xuefei.,Peng, Xiaotong.,...&Wei, Gangjian.(2024).In Situ Analysis of Sulfur Isotopic Fractionation in Deep-Sea Corals Using Secondary-Ion Mass Spectrometry: Insights Into Vital Effects.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,129(10),19. |
| MLA | He, Miaohong,et al."In Situ Analysis of Sulfur Isotopic Fractionation in Deep-Sea Corals Using Secondary-Ion Mass Spectrometry: Insights Into Vital Effects".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 129.10(2024):19. |
入库方式： OAI收割
来源：深海科学与工程研究所
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