ESR Chronology of Bedrock Fault Activity in Carbonate Area: Preliminary Results from the Study of the Lijiang-Xiaojinhe Fault, Southeastern Tibet, China

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Geochronometria Pub Date : 2021-01-01 DOI:10.2478/geochr-2020-0033

G. Yin, Chun-ru Liu, R. Yuan, Fei Han, R. Ding, J. Bahain

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引用次数: 1

Abstract

Abstract Carbonated rocks constitute one of the main lithologies of the southeastern Tibet area, China, a tectonically very active zone. However, due to the lack of suitable dating materials, it is difficult to carry out chronological studies of the local tectonic evolution in such carbonate areas. In the present study, electron spin resonance (ESR) method had been applied on the dating of carbonates heated during fault activity of the Lijiang-Xiaojinhe (LX) Fault, an important active fault located in the northwest of Yunnan Province. Clear displaced landforms show that the fault has undergone strong late-Quaternary activity. During the fault activity, the heat produced by friction lead to the melting of the frictional surface of the rocks, and the melting can attenuate or zero the ESR dating signal of carbonate. The aim of the present paper was to check the ability of carbonate use to chronologically identify fault activity using electron spin resonance (ESR) method. The results showed the last fault activity of the LX fault was dated by ESR about 2.0±0.2 ka ago, in agreement with historical and radiocarbon data. Hence ESR can be if necessary a practicable dating alternative method for the study of fault activity chronology in carbonate rock area.

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碳酸盐岩区基岩断裂活动的ESR年代学——藏东南丽江—小金河断裂研究的初步结果

碳酸盐岩是中国西藏东南部一个构造非常活跃的地区的主要岩性之一。然而，由于缺乏合适的测年材料，对此类碳酸盐岩地区的局部构造演化进行年代学研究是困难的。本文应用电子自旋共振(ESR)方法对云南西北部一条重要的活动断层丽江—小金河断裂活动期间加热的碳酸盐岩进行了测年。明显的位移地貌表明该断裂经历了强烈的晚第四纪活动。在断层活动过程中，摩擦产生的热量导致岩石摩擦面熔融，熔融使碳酸盐的ESR测年信号衰减或为零。本文的目的是利用电子自旋共振(ESR)方法来检查碳酸盐岩地层对断层活动的年代学识别能力。结果表明，LX断裂的最后一次断层活动时间约为2.0±0.2 ka，与历史和放射性碳资料一致。因此，如果有必要，ESR可以作为碳酸盐岩断裂活动年代学研究的一种可行的测年替代方法。

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来源期刊

Geochronometria 地学-地球科学综合

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geochronometria is aimed at integrating scientists developing different methods of absolute chronology and using them in different fields of earth and other natural sciences and archaeology. The methods in use are e.g. radiocarbon, stable isotopes, isotopes of natural decay series, optically stimulated luminescence, thermoluminescence, EPR/ESR, dendrochronology, varve chronology. The journal publishes papers that are devoted to developing the dating methods as well as studies concentrating on their applications in geology, palaeoclimatology, palaeobiology, palaeohydrology, geocgraphy and archaeology etc.