Semi‐Quantification of the Calcium Carbonate in Marine Sediments by Visible and Near‐Infrared Diffuse Reflectance Spectroscopy

作者：Wei Cao, Qingsong Liu, Zhaoxia Jiang, Yi Zhong, Congcong Gai, Haosen Wang, Dunfan Wang · 发表于：Geochemistry Geophysics Geosystems · 年份：2024 · DOI：10.1029/2023gc011370 · 被引用次数：8 · 研究领域：Geochemistry and Geologic Mapping、Hydrocarbon exploration and reservoir analysis、Spectroscopy and Chemometric Analyses

Abstract As one of the most widespread components in marine sediments, calcium carbonate (CaCO 3 ) plays a crucial role in the global carbon cycle and climate changes. To efficiently semi‐quantify the CaCO 3 concentration, a more effective, non‐destructive, economic, and accurate technique is required. Diffuse reflectance spectroscopy (DRS) has been widely used for the detection and quantification of minerals but has been less studied for CaCO 3 . This study synthesized a series of samples with well‐determined content of CaCO 3 to analyze the visible and near‐infrared DRS characteristics. Results show that the intensity of the second derivative of Kubelka‐Munk (K‐M) remission functions of the DRS spectra at 2,340 nm ( I 2340 ) is linearly correlated with the CaCO 3 content. Then, the new proxy I 2340 was applied for marine sediments from the Pacific Ocean with known CaCO 3 concentrations determined previously by chemical methods, and the robustness of the I 2340 as the proxy for CaCO 3 concentration was attested.