| 引用本文: | 王楠,刘思远,刘羿,李云帅.2025.新兴碳酸盐团簇同位素温度计地质应用进展和挑战[J].地球环境学报,16(3):257-277 |
| WANG Nan,LIU Siyuan,LIU Yi,LI Yunshuai.2025.Advances and challenges of carbonate clumped isotope thermometry in geological applications[J].Journal of Earth Environment,16(3):257-277 |
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| 摘要: |
| 团簇同位素是指一个分子或基团中重同位素之间彼此成键（团簇）所构成的同位素体。与传统的碳酸盐氧同位素温度计相比，碳酸盐团簇同位素温度计不依赖古流体的氧同位素组成，重建误差可小于2 ℃，是具有极大潜力的古温度重建技术，在追溯冰川演化历史及“雪球”地球的起因与结束标志等古气候领域的若干科学问题上提供准确的温度约束。近年来Δ47在地质构造领域的应用工作也大量展开，在完善全球板块运动模型、探索地球内部动力学机制等重大科学问题中发挥着重要作用。介绍碳酸盐团簇同位素温度计的基本原理，重点评述其在古高程与古气候重建、盆地热历史与古流体恢复等方面的研究思路，最后提出Δ47在重建古气候与古构造演化历史等地质研究中尚未解决的问题和应用前景，以期为解决地球历史上重大古气候、古生态与古构造问题提供全新视角，为预测未来全球气候环境演化特征提供理论依据。 |
| 关键词: 碳酸盐 团簇同位素 古高程 古气候 成岩作用 地质应用 |
| DOI：10.7515/JEE221034 |
| CSTR：32259.14.JEE221034 |
| 分类号: |
| 基金项目:国家重点研发计划（2021YFC3000604）；国家自然科学基金项目（4192200195） |
| 英文基金项目:National Key Research and Development Program of China (2021YFC3000604); National Natural Science Foundation of China (4192200195) |
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| Advances and challenges of carbonate clumped isotope thermometry in geological applications |
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WANG Nan1, LIU Siyuan1, LIU Yi1, 2*, LI Yunshuai1, 2
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1. School of Earth System Science, Tianjin University, Tianjin 30072, China
2. Institute of Surface-Earth System Science, Tianjin University, Tianjin 30072, China
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| Abstract: |
| Background, aim, and scope Carbonate clumped isotope thermometry (Δ47) is an emerging geological research tool that provides important insights into critical changes in the Earth’s history, such as the “Snowball Earth” event. This review will provide a new opportunity for geologists to apply carbonate clumped isotope thermometry perspective to outstanding problems in geological history. Materials and methods This paper reviews the analytical methods and applications of clumped isotope thermometry in geological research, focusing on paleoelevation and paleoclimate reconstruction, basin thermal history and paleofluids. In addition, we offer our perspective on the challenges and prospects in these areas. Results Carbonate clumped isotope thermometry is a powerful proxy for reconstructing past temperatures. Based on the 13C—18O bond ordering in carbonates, Δ47 is independent of the isotopic composition of the carbon and oxygen in the parent water. Depending on the geological setting in which the carbonates grew, Δ47 can provide important constraints on paleoenvironmental changes. This thermometer has recently become widely used in the study of geological history. Discussion Although, this temperature proxy provides new opportunities for understanding the geological evolution process, it also presents many challenges. First, although it has been proved that carbonate standardization can significantly reduce differences between laboratories, the limited number of standards cannot fully meet the requirements of each laboratory. Second, large uncertainties arise when extrapolating to geologic histories due to the kinetic isotope effect during carbonate precipitation and 13C—18O bond reordering. Last, the quantitative linkage between the isotopic composition of biogenic carbonate and climatic factors is weak, hindering the precise reconstruction of the paleoclimate. Conclusions Current applications of the carbonate clumped isotope mainly focus on the reconstruction of paleoelevation, paleoclimate and the investigation of diagenesis in the shallow crust. However, the limitations of Δ47-based thermometers are also evident. Recommendations and perspectives (1) Explore internationally recognized carbonate reference materials for the inter-laboratory calibration. (2) Precise measurement of Δ48 and Δ47 compositions can improve the accuracy of temperature reconstructions, even under the influence of kinetics. (3) When attempting to constrain past seasonal variations of temperature, researchers should develop a robust understanding of the biology, ecology, and geochemistry of the target species. (4) In the future, Δ48 could be targeted as a complementary isotopic marker for diffusive 13C—18O bond breakage and reformation in the solid mineral lattice. |
| Key words: carbonate clumped isotope paleoelevation paleoclimate diagenesis tectonic applications |
