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New applications of electron spin resonance dating dosimetry and microscopy

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So this study focuses on developing a new technique of using calcareous gouges to gain an insight into the ages of latest seismogenic event within the Holocene. Accordingly, this study employs a novel approach of using calcareous gouge as an active fault dating material to supplement the existing methods with the main objective to identify a useful ESR signal for dating of calcareous fault gouge and also develop a method to determine the age of the latest seismogenic event of the Ushikubi Fault in central Japan. However, ESR results gotten through this signal are unlikely because of the following reasons: This area shows a rugged relief, with incised valleys, which are drained by the Jinzu, Joganji and Shou rivers [ 13 ]. The northern margin of the Hida highlands belongs to the Hida geologic belt. This technique proved reliable because the mean age 1. The basement consists of Paleozoic Hida metamorphic rocks felsic gneiss, hornblende gneiss, meta-mafic rocks, crystalline limestone and calcareous gneiss that contain biotite. These underscore the importance of monitoring of active tectonics. Among these defect centers, a paramagnetic center called oxygen vacancy with one electron center has been used extensively to characterize and date faults. One of the countries in the World that is most vulnerable to the aforementioned components of active tectonics is Japan [ 3 , 4 ]. A younger age value would have been obtained if a lower artificial irradiation dose rate and a relatively pure carbonate fault gouge were used in the ED determination. Although the age of the latest event of the Ushikubi fault has been estimated indirectly using the radiocarbon dating method, the ESR method has not yet been employed.

New applications of electron spin resonance dating dosimetry and microscopy


The northern margin of the Hida highlands belongs to the Hida geologic belt. This technique proved reliable because the mean age 1. Accordingly, this study employs a novel approach of using calcareous gouge as an active fault dating material to supplement the existing methods with the main objective to identify a useful ESR signal for dating of calcareous fault gouge and also develop a method to determine the age of the latest seismogenic event of the Ushikubi Fault in central Japan. Introduction Active tectonics is associated with uplifts, earthquakes, volcanic eruptions, landslides and faulting, which have been reported having a direct impact on the environment and population [ 1 , 2 ]. Irrespective of all attempts to date young faults with the ESR method using defect centers in quartz, the main limitation reported by Noller et al. Some of these investigations include: These basements are intruded by Jurassic Funatsu granites which are overlain by Cretaceous sedimentary rocks of the Tetori group sandstones, mudstones, conglomerates [ 13 ] Fig. Moreover, isochronal experiment revealed that the gouge did not comprise pure carbonates but consisted of a mixture of calcite and quartz grains. This technique of ESR method is limited by obtaining only ages that are greater than tens of millennia. Although the age of the latest event of the Ushikubi fault has been estimated indirectly using the radiocarbon dating method, the ESR method has not yet been employed. This area shows a rugged relief, with incised valleys, which are drained by the Jinzu, Joganji and Shou rivers [ 13 ]. A younger age value would have been obtained if a lower artificial irradiation dose rate and a relatively pure carbonate fault gouge were used in the ED determination. The established ESR method reported by Ikeya et al. Among these defect centers, a paramagnetic center called oxygen vacancy with one electron center has been used extensively to characterize and date faults. Abstract The ages of fault events of active faults have been estimated using electron spin resonance ESR signals of siliceous gouges. So this study focuses on developing a new technique of using calcareous gouges to gain an insight into the ages of latest seismogenic event within the Holocene. As far as temporal characterization is concerned, quartz in fault gouges has been used to estimate the age of latest fault movements using the electron spin resonance ESR method [ 5 — 8 ]. For the first time, signal B of the ESR method has been used to estimate the age of the Ushikubi fault from calcareous gouge. However, ESR results gotten through this signal are unlikely because of the following reasons: These underscore the importance of monitoring of active tectonics. One of the countries in the World that is most vulnerable to the aforementioned components of active tectonics is Japan [ 3 , 4 ]. In recognition of this importance, earth scientists have not only intensified but also refined on both spatial and temporal dimensions the characterization of faults and earthquake prone zones in Japan. The basement consists of Paleozoic Hida metamorphic rocks felsic gneiss, hornblende gneiss, meta-mafic rocks, crystalline limestone and calcareous gneiss that contain biotite. The environmental and human impacts from the incidence of active tectonics can among others be exemplified by the March 11, earthquake and tsunami along the northeastern coast of Japan, and the Niigata Chuetsu-Oki earthquakes. Because of the importance of understanding active faults and estimating the age of faults to improve upon the mitigation management and hazard assessment [ 11 ], various investigations by various methods have been employed to elucidate the recent history and activity of the Ushikubi fault in central Japan.

New applications of electron spin resonance dating dosimetry and microscopy


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