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Characteristics of Seismogenic Dust Particles from Mountain and Its Significance for Paleoseismic Records in Tufa Section: A Case Study of Jiuzhaigou, China
Jing, S.; Wang, F.; Capezzuoli, E.; Huang, G.; Li, J.; Jiang, H.; Zhou, Z.; Zhao, X.; Dong, F.; Brogi, A. Characteristics of Seismogenic Dust Particles from a Mountain and Their Significance for Paleoseismic Records in a Tufa Section: A Case Study of Jiuzhaigou, China. Minerals2023, 13, 981.
Jing, S.; Wang, F.; Capezzuoli, E.; Huang, G.; Li, J.; Jiang, H.; Zhou, Z.; Zhao, X.; Dong, F.; Brogi, A. Characteristics of Seismogenic Dust Particles from a Mountain and Their Significance for Paleoseismic Records in a Tufa Section: A Case Study of Jiuzhaigou, China. Minerals 2023, 13, 981.
Jing, S.; Wang, F.; Capezzuoli, E.; Huang, G.; Li, J.; Jiang, H.; Zhou, Z.; Zhao, X.; Dong, F.; Brogi, A. Characteristics of Seismogenic Dust Particles from a Mountain and Their Significance for Paleoseismic Records in a Tufa Section: A Case Study of Jiuzhaigou, China. Minerals2023, 13, 981.
Jing, S.; Wang, F.; Capezzuoli, E.; Huang, G.; Li, J.; Jiang, H.; Zhou, Z.; Zhao, X.; Dong, F.; Brogi, A. Characteristics of Seismogenic Dust Particles from a Mountain and Their Significance for Paleoseismic Records in a Tufa Section: A Case Study of Jiuzhaigou, China. Minerals 2023, 13, 981.
Abstract
The sedimentary characteristics of the special interlayer contained in the section of the Sparking Lake dam revealed by the 8.8 Jiuzhaigou earthquake in 2017 are obviously different from the tufa in the dam body, and they are considered to be prehistoric flood relics. Based on the study of the particulate matter from the 8.8 Jiuzhaigou earthquake, this paper combines comparative petrographic, mineralogical, geochemical and chronological studies of the special interbedded sediments of the Sparking Lake dam with other genetic samples to obtain homology information and genetic links, as well as to explore the tufa depositional dynamics and earthquake disaster subsidence. The palaeoseismic benefit in the discontinuity layer is explored, and the palaeoseismic information embedded in the profiles is extracted, providing a new idea to reconstruct the palaeoseismic events in the tufa deposition sequence. According to X-ray diffraction, laser particle size analysis and scanning electron microscope experiments, the particulate matter in the Jiuzhaigou mountains has its own specific mineralogical characteristics. The mineral composition of the particulate matter is basically calcite. The particle size is large, and the single particle is mostly angular and subangular. The fracture morphology observed under the single particle microscope is uneven, showing the characteristics of dust caused by earthquake disasters. Geochemical analysis data show that the provenance of various types of particles in the same area is stable, indicating the homology of terrestrial carbonate sedimentation in the karst system. Combined with mineralogy and grain size morphology, the interbedded particles in the tufa depositional profile have the potential application of palaeoseismic archives to record extreme seismic events. The palaeoseismic date was inferred from the chronological data of special interlayered sediments in the tufa dam body. Therefore, the tufa bedding can be related to the palaeoearthquake, and the special interlayer of the tufa section can be used to reconstruct palaeoearthquakes.
Environmental and Earth Sciences, Geochemistry and Petrology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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