OPTICALLY STIMULATED LUMINESCENCE DATING OF LATE QUATERNARY SEDIMENTS AT DAHUANGSHAN TRENCH ALONG FUKANG FAULT ZONE, XINJIANG

doi:10.3969/j.issn.0253-4967.2014.04.010

SEISMOLOGY AND EGOLOGY ›› 2014, Vol. 36 ›› Issue (4): 1053-1063.DOI: 10.3969/j.issn.0253-4967.2014.04.010

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OPTICALLY STIMULATED LUMINESCENCE DATING OF LATE QUATERNARY SEDIMENTS AT DAHUANGSHAN TRENCH ALONG FUKANG FAULT ZONE, XINJIANG

DAI Xun-ye^1,2, SHEN Jun², WU Chuan-yong³, YANG Hui-li⁴

1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
2. Institute of Disaster Prevention, Yanjiao 065201, China;
3. Earthquake Administration of Xinjiang, Urumqi 830011, China;
4. State Key Laboratory of Earthquake Dynamic, Institute of Geology, China Earthquake Administration, Beijing 100029, China

Received:2014-03-02 Online:2014-12-30 Published:2015-01-07

新疆阜康断裂带中段大黄山探槽晚第四纪沉积物的光释光测年

戴训也^1,2, 沈军², 吴传勇³, 杨会丽⁴

1. 中国地震局兰州地震研究所, 兰州 730000;
2. 防灾科技学院, 燕郊 065201;
3. 新疆维吾尔自治区地震局, 乌鲁木齐 830011;
4. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029

通讯作者: 沈军,研究员,E-mail:shenjuneq@qq.com
作者简介:戴训也,男,1987年生,2011年毕业于西北大学地质学专业,现为中国地震局兰州地震研究所在读硕士研究生,主要从事活动构造方面的研究,E-mail:daixunye@qq.com.
基金资助:
科技部国际科技合作项目(2012DFR20440)和财政部重大专项"我国地震重点监视防御区活动断层地震危险性评价"(201108001)共同资助.

Abstract

Abstract:

In the study of active faults, obtaining the exact age of the strata is an extremely important step. The optically stimulated luminescence (OSL) dating method, a technique closely related to thermoluminescence (TL), is developing extensively on dating for Quaternary sediments in recent years. Fukang Faults, located in the eastern Tianshan arc nappe tectonic zone, are typical arc thrusting faults. The dating samples collected from Dahuangshan trench of Fukang Fault zone are used to determine the activity of the fault. 23 OSL samples were obtained from the trench. We selected 4～11μm fine-grained quartz through pre-treatment process and analysed them by using sensitivity-corrected multiple aliquot regenerative-dose (SMAR) protocol. Equivalent dose (De) preheat plateau test is an often used approach to determine the appropriate preheat temperature in OSL dating. The preheat plateau test of sample LED12-297 shows that 220～260℃ are the appropriate preheat plateau temperature regions to get fundamental De. The dating results show that the OSL stratigraphic ages of the samples are consistent with stratigraphic sequence and that Fukang Fault is a Holocene active fault. It is found that the last event of Fukang Fault occurred (1.90±0.14) ka to (3.47±0.17) ka ago. The OSL ages and their related stratigraphic vertical displacement are used to calculate the vertical slip rate of the fault, which is 0.17mm/a.

Key words: Fukang Fault zone, optically stimulated luminescence dating, fine-grained quartz, sensitivity-corrected multiple aliquot regenerative-dose(SMAR)protocol

摘要：

对新疆阜康断裂带中段大黄山探槽的23个样品进行了细颗粒石英光释光简单多片再生法测年.样品LED12-297等效剂量的预热坪实验结果表明, 在220～260℃的预热温度范围内均能获得基本一致的等效剂量值.测年结果显示, 样品年龄与地层的时序性一致, 表明阜康断裂带为全新世活动断层.根据探槽剖面错断的最新地层及其上覆地层的光释光年龄判断, 断层的最新1次古地震事件发生在距今(1.90±0.14)ka～(3.47±0.17)ka.根据地层的垂直位移量与测年结果得到, 阜康断层大黄山段的垂直滑动速率为0.17mm/a.

关键词: 阜康断裂带, 光释光(OSL)测年, 细颗粒石英, 简单多片再生法(SMAR)

CLC Number:

P315.2

DAI Xun-ye, SHEN Jun, WU Chuan-yong, YANG Hui-li. OPTICALLY STIMULATED LUMINESCENCE DATING OF LATE QUATERNARY SEDIMENTS AT DAHUANGSHAN TRENCH ALONG FUKANG FAULT ZONE, XINJIANG[J]. SEISMOLOGY AND EGOLOGY, 2014, 36(4): 1053-1063.

戴训也, 沈军, 吴传勇, 杨会丽. 新疆阜康断裂带中段大黄山探槽晚第四纪沉积物的光释光测年[J]. 地震地质, 2014, 36(4): 1053-1063.

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OPTICALLY STIMULATED LUMINESCENCE DATING OF LATE QUATERNARY SEDIMENTS AT DAHUANGSHAN TRENCH ALONG FUKANG FAULT ZONE, XINJIANG

新疆阜康断裂带中段大黄山探槽晚第四纪沉积物的光释光测年

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