Abstract
The depositional products of sedimentary rocks provide vital references for investigating the paleoenvironment, paleogeography, and tectonic evolution history. However, the detection methods of geological evolution are still relatively complicated, and how to combine geological age and geological evolution is confusing. Based on the sensitivity of terahertz waves to organic matter, a THz dating method was introduced for characterizing the geological age of sedimentary rocks. In this study, the geological evolution of Liujiang Basin was analyzed by using terahertz time domain spectroscopy (THz-TDS). According to the close relation between organic matter content and sedimentary environment, it can be inferred that the geological deposition in this area is affected by Marine cover. In addition, the refractive index of Ordovician sedimentary rocks is significantly higher than that of other sedimentary rocks. Based on these results, it is inferred that the sedimentary environment of the Liujiang Basin gradually changed from continental deposition to deep-water marine deposition from the Neoproterozoic to the Ordovician, and the sea water gradually retreated due to the crustal movement, resulting in a transition from deep-water deposition to continental inshore ocean facies deposition. These findings are highly consistent with the geological history of the study area. Combined with principal component analysis (PCA) technology, the relative geological age of sedimentary rocks can be divided. Our study con-firmed the reliability of this THz dating technique, which provides an effective way to study the geological evolution history of sedimentary rocks.
Highlights
Sedimentary strata provide natural records of geologic history, and the accurate determination of their sequence and age is a prerequisite for studying their paleoenvironment, paleogeography, and tectonic evolution history [1–3]
Certain minerals are usually associated with a particular geological body, and the particular geological body is formed during a particular geological period, which requires a definite sedimentary environment for the rocks
Based on the results in this research, more and more sedimentary rocks can be measured using the THz method, and the results can be combined with principal component analysis (PCA) to obtain a large database, which can be used as an important reference standard to judge sedimentary environment of sedimentary rocks
Summary
Sedimentary strata provide natural records of geologic history, and the accurate determination of their sequence and age is a prerequisite for studying their paleoenvironment, paleogeography, and tectonic evolution history [1–3]. The geochemical compositions of sedimentary rocks can be studied to obtain information about the chemical environment, composition, and tectonic environment of the source area when they were deposited. These approaches may result in significant chronological uncertainty for stratum, hampering a direct comparison with historical data [9–23] Because this dating method has age limitations, after obtaining the approximate age, it is necessary to analyze the geological evolution law together with other testing methods. The THz spectroscopy was used to study sedimentary rock samples from nine areas with six different geological ages. The refractive index and absorption coefficient of the sample are obtained by further analysis
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