尼泊尔喜马拉雅山脉中央丘里亚冲断层的电子自旋共振测年

doi:10.13745/j.esf.sf.2023.4.1

地学前缘 ›› 2023, Vol. 30 ›› Issue (4): 260-269.DOI: 10.13745/j.esf.sf.2023.4.1

所属专题：印度-欧亚大陆碰撞及其远程效应

• “印度-欧亚大陆碰撞及其远程效应”专栏之八 • 上一篇下一篇

尼泊尔喜马拉雅山脉中央丘里亚冲断层的电子自旋共振测年

NEUPANE Bhupati¹^,²^,³^,^*(), ZHAO Junmeng⁴, LIU Chunru⁵, PEI Shunping¹, MAHARJAN Bishal⁶, DHAKAL Sanjev¹

1.State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
2.Department of Civil Engineering, Sagarmatha Engineering College, Lalitpur 44600, Nepal
3.Institute of Fundamental Research and Studies (InFeRS), Kathmandu 44600, Nepal
4.Tibet University, Lhasa 850000, China
5.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
6.Earth Science Research Centre, Kathmandu 44600, Nepal

收稿日期:2023-01-15 接受日期:2023-03-23 出版日期:2023-07-25 发布日期:2023-07-07
通讯作者: NEUPANE Bhupati

Electron spin resonance dating for the Central Churia Thrust of the Nepal Himalaya

NEUPANE Bhupati¹^,²^,³^,^*(), ZHAO Junmeng⁴, LIU Chunru⁵, PEI Shunping¹, MAHARJAN Bishal⁶, DHAKAL Sanjev¹

1. State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
2. Department of Civil Engineering, Sagarmatha Engineering College, Lalitpur 44600, Nepal
3. Institute of Fundamental Research and Studies (InFeRS), Kathmandu 44600, Nepal
4. Tibet University, Lhasa 850000, China
5. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
6. Earth Science Research Centre, Kathmandu 44600, Nepal

Received:2023-01-15 Accepted:2023-03-23 Online:2023-07-25 Published:2023-07-07
Contact: NEUPANE Bhupati
Supported by:
The Chinese Academy of Sciences President’s International Fellowship Initiative (PIFI) for Visiting Scientist(2023VMC0003);The National Science Foundation of China(42230307);The Strategic Priority Research Program (A) of the Chinese Academy of Sciences(XDA20070302)

摘要/Abstract

摘要：

利用断层泥样品中石英颗粒的ESR信号,研究尼泊尔喜马拉雅山脉南段中央丘里亚冲断层(CCT)第四纪断层活动的时间模式。为了更好地理解重置过程,分析了不同石英粒度的ESR信号、累积剂量和年龄的变化。样品CCT3的E1’中心(ESR定年的一种信号)的ESR强度结果显示,大块、粗粒(200~250 μm)和细粒(40~80 μm)粒度组分存在显著的空间变化。第四纪断层的ESR数据,粗年龄为(5±0.5) ka,细分数平均年龄为(50±10) ka,显示了西瓦利克地区最近的伸展事件。

关键词: 大地构造, 地质年代学, 中央丘里亚冲断层(CCT), ESR测年, 断层泥, 第四纪断层

Abstract:

A temporal pattern of Quaternary fault activity of the Central Churia Thrust (CCT) in the southern Nepal Himalaya has been investigated using Electron Spin Resonance (ESR) signals of quartz grains in fault gouge samples. In order to better understand the reset process, the study of the variations in ESR signal, accumulated dose, and age in various quartz grain sizes was analysed. The results of the E1’ center (a type of signal for ESR dating) of sample CCT3 show a significant spatial variation in the bulk, coarse (200-250 μm), and fine (40-80 μm) grain-size fractions. The ESR date of Quaternary faults, coarser age of (5±0.5) ka and finer fraction mean age of (50±10) ka, demonstrates the latest extension event in the Siwalik region.

Key words: tectonics, geochronology, Central Churia Thrust (CCT), ESR dating, fault gouge, Quaternary fault

中图分类号:

P597
P542

NEUPANE Bhupati, ZHAO Junmeng, LIU Chunru, PEI Shunping, MAHARJAN Bishal, DHAKAL Sanjev. 尼泊尔喜马拉雅山脉中央丘里亚冲断层的电子自旋共振测年[J]. 地学前缘, 2023, 30(4): 260-269.

NEUPANE Bhupati, ZHAO Junmeng, LIU Chunru, PEI Shunping, MAHARJAN Bishal, DHAKAL Sanjev. Electron spin resonance dating for the Central Churia Thrust of the Nepal Himalaya[J]. Earth Science Frontiers, 2023, 30(4): 260-269.

图/表 9

Fig.1 A—Tectonic map of the Nepal Himalaya. B—Geological map of the study area (Modified after Mugner et al., 1999) showing a sample location. MFT, Main Frontal Thrust; MBT, Main Boundary Thrust; MCT, Main Central Thrust; STDS, South Tibetan Detachment system; CCT, Central Churia Thrust.

Fig.2 a—Field photographs of the fault gouge locations and sampling locations near Dobhan village, Palpa District, western Nepal. b—Columnar section along the traverse section to delineate the fault gouge location and its associative country rock.

Fig.3 a—XRD analysis chart of sample CCT-2 showing a peak in the quartz. b—XRD analysis chart of sample CCT-3 showing maximum count for quartz.

Fig.4 The ESR signal intensity of quartz for E’ and Ge centers from the CCT quartz samples.

Table 1 ESR dating results using quartz E’ center signal from samples of the CCT

	Microns/μm	w(U)/ (μg·g^-1)	w(Th)/ (μg·g^-1)	w(K₂O)/%	Cosmic/ (Gy·ka^-1)	W/%	Dose Rate/ (Gy·ka^-1)	Equivalent Dose/Gy	ESR age/ka
CCT2	40-80	6.21	21.9	2.8	0.25	5	5.47	312±48	57±9
	80-100				0.25	5	5.43	417±57	77±10
	100-140				0.25	5	5.39	426±20	79±4
CCT3	40-80	5.26	23.5	2.77	0.25	5	5.34	227±71	43±13
	80-100				0.25	5	5.30	113±90	21±17
	100-140				0.25	5	5.26	51±14	10±3
	140-160				0.25	5	5.22	113±21	22±4
	160-200				0.25	5	5.19	76±17	15±3
	200-250				0.25	5	5.13	25±2.5	5±0.5

Fig.5 The dose response curves of quartz Ti-Li center ESR signals (CCT2 40-80μm).

Table 2 Study of Carbon and Oxygen isotopes of the fault samples

Sample	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰	Z	δ¹⁸O_SMOW/‰
CCT1	-7.986	-6.300	107.807	23.014 15
CCT2	-7.904	-8.322	106.968	20.932 501
CCT3	-7.868	-9.527	106.442	19.691 953 5

Table 3 Total Organic Content and Total Carbon content of the respective fault gouge samples

SN	Sample	w(TOC)/%	w(TC)/%
1	CCT1	0.027	0.011
2	CCT2	0.089	0.045
3	CCT3	0.004	0.011

Fig.6 General view of the active fault area (CCT) shown just after the MFT. CCT—Central Churia Thrust; MFT—Main Frontal Thrust.

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尼泊尔喜马拉雅山脉中央丘里亚冲断层的电子自旋共振测年

Electron spin resonance dating for the Central Churia Thrust of the Nepal Himalaya

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