Lucarelli Jamie K, Carroll Hannah M, Ulrich Robert N, Elliott Ben M, Coplen Tyler B, Eagle Robert A, Tripati Aradhna
Department of Earth, Planetary, and Space Sciences, Department of Atmospheric and Oceanic Sciences, Center for Diverse Leadership in Science, Institute of the Environment and Sustainability, UCLA, Los Angeles, CA, USA.
US Geological Survey, Reston, VA, USA.
Geochem Geophys Geosyst. 2023 Feb;24(2). doi: 10.1029/2022gc010458. Epub 2022 Sep 27.
Carbonate clumped isotope geochemistry has primarily focused on mass spectrometric determination of 47 CO for geothermometry, but theoretical calculations and recent experiments indicate paired analysis of the 47 (COO) and 48 (COO) isotopologues (referred to as and ) can be used to study non-equilibrium isotope fractionations and refine temperature estimates. We utilize 5,448 and 3,400 replicate measurements of carbonate samples and standards, and 183 and 195 replicate measurements of gas standards from 2015 to 2021 from a multi-year and multi-instrument data set to constrain and values for 27 samples and standards, including Devils Hole cave calcite, and study equilibrium -, -temperature, and -temperature relationships. We compare results to previously published findings and calculate equilibrium regressions based on data from multiple laboratories. We report acid digestion fractionation factors, and , and account for their dependence on the initial clumped isotope values of the mineral.
碳酸盐团簇同位素地球化学主要集中于通过质谱法测定用于地质测温的⁴⁷CO，但理论计算和近期实验表明，对⁴⁷(COO)和⁴⁸(COO)同位素异构体（分别称为ε和ζ）进行配对分析可用于研究非平衡同位素分馏并改进温度估算。我们利用2015年至2021年来自一个多年度和多仪器数据集的5448次和3400次碳酸盐样品及标准品的重复测量，以及183次和195次气体标准品的重复测量，来约束包括魔鬼洞洞穴方解石在内的27个样品和标准品的ε和ζ值，并研究平衡ε-温度、ζ-温度和ε-ζ温度关系。我们将结果与先前发表的研究结果进行比较，并基于多个实验室的数据计算平衡回归。我们报告了酸消解分馏因子α和β，并说明了它们对方解石初始团簇同位素值的依赖性。
