A Unified Clumped Isotope Thermometer Calibration (0.5-1,100°C) Using Carbonate-Based Standardization
A Unified Clumped Isotope Thermometer Calibration (0.5-1,100°C) Using Carbonate-Based Standardization
复制标题
DOI：
10.1029/2020gl092069
复制
发表时间：
2021-04-16
影响因子：
5.2
通讯作者：
Bergmann, K. D.
中科院分区：
文献类型：
--
作者：
Anderson, N. T.;Kelson, J. R.;Bergmann, K. D.
碳酸盐块状同位素测温法有可能独立地限制碳酸盐矿物的形成温度和流体氧同位素组成，这使我们能够深入了解地球科学中长期存在的问题，但校准方案之间的仍然存在的差异阻碍了对温度测量的解释。为了解决校准之间的差异，我们设计和分析了一套样本(总共41个样本)，具有广泛的地学适用性，具有异常广泛的地层温度、降水方法和矿物学范围。尽管方解石和白云石之间的比较仍然没有定论，但我们没有看到样本类型之间的统计上的显著偏移。当数据以相同的方式简化时，本研究定义的回归与之前四项使用碳酸盐标准化的校准研究定义的回归几乎相同；我们将这些数据结合在一起，提出了一个复合的碳酸盐标准化回归方程。在广泛的温度和样品类型上的一致性表明，统一的、广泛适用的集束同位素温度计校准。
The potential for carbonate clumped isotope thermometry to independently constrain both the formation temperature of carbonate minerals and fluid oxygen isotope composition allows insight into long-standing questions in the Earth sciences, but remaining discrepancies between calibration schemes hamper interpretation of temperature measurements. To address discrepancies between calibrations, we designed and analyzed a sample suite (41 total samples) with broad applicability across the geosciences, with an exceptionally wide range of formation temperatures, precipitation methods, and mineralogies. We see no statistically significant offset between sample types, although the comparison of calcite and dolomite remains inconclusive. When data are reduced identically, the regression defined by this study is nearly identical to that defined by four previous calibration studies that used carbonate-based standardization; we combine these data to present a composite carbonate-standardized regression equation. Agreement across a wide range of temperature and sample types demonstrates a unified, broadly applicable clumped isotope thermometer calibration.