Fluid-mediated exchange reaction induces clumped isotope resetting: Insights from aragonite dolomitization experiments
文献类型：期刊论文
| 作者 | Guo, Yangrui2; Kong, Kai1,2; Liu, Xi2; Deng, Wenfeng2; Wei, Gangjian2 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2024-05-20 |
| 卷号 | 653页码:12 |
| 关键词 | Clumped isotope Oxygen isotope Dolomitization Carbonate recrystallization Isotopic exchange |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122036 |
| 英文摘要 | Carbon and oxygen isotopic exchange between external and internal fluids of carbonate minerals can reset the clumped isotope composition ( Delta 47 ) of paleotemperature archives. Understanding the nature of this exchange during carbonate diagenetic alterations is essential for correctly interpreting the paleoenvironmental significance of Delta 47 -derived temperatures. Through batch hydrothermal experiments on aragonitic coral carbonates, we examine the kinetic signatures of clumped isotope fractionation from the initial disequilibrium to final equilibrium states during the dolomitization of the aragonite. By analyzing oxygen isotope fractionation and Sr partitioning between carbonate and fluid, we simulate the effect of exchange reactions on the Delta 47 values. As the resetting feature of Delta 47 values in our aragonite samples disagrees with the fractionation pattern observed in previous aragonite solid-state reordering experiment, we rule out the effect of the solid-state reordering. Our findings demonstrate that isotope exchanges with internal or external fluids coexist, particularly during the early stage of aragonite self-recrystallization. The results of this study indicate that the Delta 47 value of coral aragonite is susceptible to internal exchange reactions in Mg -bearing solutions at 160-220 degrees C. Additionally, by modeling the bulk recrystallization and internal fluid -mineral exchange and evaluating their relative importance, we determine that the internal exchange reaction results in a nonlinear correlation between delta 18 O and Delta 47 values. Importantly, we highlight the previously unrecognized diagenetic scenario in which the internal fluid -mineral exchange effect on the Delta 47 value can outweigh the bulk recrystallization effect with external fluid coexisting. Consequently, our findings emphasize the need for a comprehensive assessment on the reaction kinetics for different types of recrystallization effects, to support the application of clumped isotope proxies for altered carbonate samples in diagenetic environments. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001221375100001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77012]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Guo, Yangrui |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, CAS Ctr Excellence Deep Earth Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Yangrui,Kong, Kai,Liu, Xi,et al. Fluid-mediated exchange reaction induces clumped isotope resetting: Insights from aragonite dolomitization experiments[J]. CHEMICAL GEOLOGY,2024,653:12. |
| APA | Guo, Yangrui,Kong, Kai,Liu, Xi,Deng, Wenfeng,&Wei, Gangjian.(2024).Fluid-mediated exchange reaction induces clumped isotope resetting: Insights from aragonite dolomitization experiments.CHEMICAL GEOLOGY,653,12. |
| MLA | Guo, Yangrui,et al."Fluid-mediated exchange reaction induces clumped isotope resetting: Insights from aragonite dolomitization experiments".CHEMICAL GEOLOGY 653(2024):12. |
入库方式： OAI收割
来源：广州地球化学研究所
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