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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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。
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 sensitivitycorrected 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. 17 mm / a.
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 sensitivitycorrected 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. 17 mm / a.
引文
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尤惠川,任利生,张玉梅.2003.新疆阜康-吉木萨尔断裂带的几何特征与活动性研究[J].地震地质,25(3):375—384.YOU Hui-chuan,REN Sheng-li,ZHANG Yu-mei.2003.Structural geometry and activities of the Fukang-Jimusarfault zone,Xinjiang[J].Seismology and Geology,25(3):375—384(in Chinese).
Aitken M J.1998.An introduction to Optical Dating[M].Oxford University Press.39—50.
Chen Y G,Chen Y W,Chen W S,et al.2006.Preliminary results of long-term slip rates of 1999 earthquake fault byluminescence and radiocarbon dating[J].Quaternary Science Reviews,22:1213—1221.
Fattahi M.2009.Dating past earthquakes and related sediments by thermoluminescence methods:A review[J].Quaternary International,199:104—146.
Fattahi M,Richar T,Walker R T,et al.2006.Holocene slip-rate on the Sabzevar thrust fault,NE Iran,determinedusing optically stimulated luminescence(OSL)[J].Earth and Planetary Science Letters,245:673—684.
Fattahi M,Walker R T,Khatib M M,et al.2007.Slip-rate estimate and past earthquakes on the Doruneh Fault,eastern Iran[J].Quaternary Geochronology,2:284—289.
Liu J F,Chen J,Yin J H,et al.2010.OSL and AMS14C dating of the penultimate earthquake at the Leigu trenchalong the Beichuan Fault,Longmenshan,in the northeast margin of the Tibetan plateau[J].Bulletin of theSeismological Society of America,100(5B):2681—2688.
Lu Y C,Prescott,J R,Zhao H.2002.Optical dating of colluvial deposits from Xiyangfang,China and the relation topaleoearthquake events[J].Quaternary Science Reviews,21:1083—1097.
Lu Y C,Wang X L,Wintle A G.2007.A new OSL chronology for dust accumulation in the last 130,000 yr for theChinese Loess Plateau[J].Quaternary Research,67:152—160.
Murray A S,Olley J M.2002.Precision and accuracy in the optically stimulated luminescence dating of sedimentaryquartz:A status review[J].Geochronometria,21:1—16.
Murray A S,Wintle A G.2000.Luminescence dating of quartz using an improved single-aliquot regenerative-doseprotocol[J].Radiation Measurements,32(1):57—73.
Rees-Jones J.1995.Optical dating of young sediments using fine-grain quartz[J].Ancient TL,13(2):9—14.
Rittenour T M.2008.Luminescence dating of fluvial deposits:Applications to geomorphic,palaeoseismic andarchaeological research[J].Boreas,37:613—635.
Thomas P J,Reddy D V,Devender K,et al.2007.Optical dating of liquefaction features to constrain prehistoricearthquakes in Upper Assam,NE India:Some preliminary results[J].Quaternary Geochronology,2:278—283.
陈杰,卢演俦,魏兰英,等.1999.第四纪沉积物光释光测年中等效剂量测定方法的对比研究[J].地球化学,28(5):443—452.CHEN Jie,LU Yan-chou,WEI Lan-ying,et al.1999.Optically stimulated luminescence dating of Quaternarysediments:A comparison using different equivalent dose determination methods[J].Geochimica,28(5):443—452(in Chinese).
赖忠平,欧先交.2013.光释光测年基本流程[J].地理科学进展,32(5):683—693.LAI Zhong-ping,OU Xian-jiao.2013.Basic procedures of optically stimulated luminescence(OSL)dating[J].Progress in Geography,32(5):683—693(in Chinese).
刘进峰,陈杰,尹金辉,等.2010.龙门山映秀-北川断裂带擂鼓探槽剖面古地震事件测年[J].地震地质,32(2):191—199.doi:10.3969/j.issn.0253-4967.2010.02.002.LIU Jin-feng,CHEN Jie,YIN Jin-hui,et al.2010.Determination of paleoearthquake events using OSL and AMS14Cdating techniques at the Leigu trench along the Longmenshan Yingxiu-Beichuan fault zone[J].Seismology andGeology,32(2):191—199(in Chinese).
王同利,陈杰,杨传成,等.2005.Daybreak厚源α-计数仪的标定计测量影响因素的初步研究[J].地震地质,27(4):633—644.WANG Tong-li,CHEN Jie,YANG Chuan-cheng.et al.2005.Calibration of Daybreak thick source alpha counter andpreliminary study of influencing factors[J].Seismology and Geology,27(4):633—644(in Chinese).
王旭龙,卢演俦,李晓妮.2005.细颗粒石英光释光测年:简单多片再生法[J].地震地质,27(4):6l5—623.WANG Xu-long,LU Yan-chou,LI Xiao-ni.2005.Luminescence dating of fine-grained quartz in Chinese loess:Simplified multiple aliquot regenerative-dose(MAR)protocol[J].Seismology and Geology,27(4):615—623(in Chinese).
汪一鹏,沈军.2000.天山北麓活动构造基本特征[J].新疆地质,18(3):203—210.WANG Yi-peng,SHEN Jun.2000.Basic features of active structures at the northern foothill of Tianshan Mountains,China[J].Xinjiang Geology,18(3):203—210(in Chinese).
吴传勇,陈建波,沈军,等.2013.新疆阜康断裂带甘河子段晚第四纪活动特征[J].地球科学-中国地质大学学报,38(3):632—640.WU Chuan-yong,CHEN Jian-bo,SHEN Jun,et al.2013.Late-Quaternary activity characteristic of the Ganhezisegment of the Fukang fault belt in Xinjiang[J].Earth Science-Journal of China University of Geosciences,38(3):632—640(in Chinese).
吴传勇,沈军,柔洁,等.2005.新疆阜康-吉木萨尔断层晚第四纪活动与变形特征的新认识[J].西北地震学报,27(1):47—51.WU Chuan-yong,SHEN Jun,ROU Jie,et al.2005.New knowledge on the late Quaternary activity and deformationcharacteristics of Fukang-Jimusaer Fault,Xinjiang[J].Northwestern Seismological Journal,27(1):47—51(inChinese).
杨会丽,陈杰,冉勇康,等.2011.汶川8.0级地震小鱼洞地表破裂带古地震事件的光释光测年[J].地震地质,33(2):402—412.doi:10.3969/j.issn.0253-4967.2011.02.013.YANG Hui-li,CHEN Jie,RAN Yong-kang,et al.2011.Optical dating of paleoearthquake similar to the 12 MayWenchuan earthquake,at Xiaoyudong surface ruptures zone[J].Seismology and Geology,33(2):402—412(inChinese).
尤惠川,任利生,张玉梅.2003.新疆阜康-吉木萨尔断裂带的几何特征与活动性研究[J].地震地质,25(3):375—384.YOU Hui-chuan,REN Sheng-li,ZHANG Yu-mei.2003.Structural geometry and activities of the Fukang-Jimusarfault zone,Xinjiang[J].Seismology and Geology,25(3):375—384(in Chinese).
Aitken M J.1998.An introduction to Optical Dating[M].Oxford University Press.39—50.
Chen Y G,Chen Y W,Chen W S,et al.2006.Preliminary results of long-term slip rates of 1999 earthquake fault byluminescence and radiocarbon dating[J].Quaternary Science Reviews,22:1213—1221.
Fattahi M.2009.Dating past earthquakes and related sediments by thermoluminescence methods:A review[J].Quaternary International,199:104—146.
Fattahi M,Richar T,Walker R T,et al.2006.Holocene slip-rate on the Sabzevar thrust fault,NE Iran,determinedusing optically stimulated luminescence(OSL)[J].Earth and Planetary Science Letters,245:673—684.
Fattahi M,Walker R T,Khatib M M,et al.2007.Slip-rate estimate and past earthquakes on the Doruneh Fault,eastern Iran[J].Quaternary Geochronology,2:284—289.
Liu J F,Chen J,Yin J H,et al.2010.OSL and AMS14C dating of the penultimate earthquake at the Leigu trenchalong the Beichuan Fault,Longmenshan,in the northeast margin of the Tibetan plateau[J].Bulletin of theSeismological Society of America,100(5B):2681—2688.
Lu Y C,Prescott,J R,Zhao H.2002.Optical dating of colluvial deposits from Xiyangfang,China and the relation topaleoearthquake events[J].Quaternary Science Reviews,21:1083—1097.
Lu Y C,Wang X L,Wintle A G.2007.A new OSL chronology for dust accumulation in the last 130,000 yr for theChinese Loess Plateau[J].Quaternary Research,67:152—160.
Murray A S,Olley J M.2002.Precision and accuracy in the optically stimulated luminescence dating of sedimentaryquartz:A status review[J].Geochronometria,21:1—16.
Murray A S,Wintle A G.2000.Luminescence dating of quartz using an improved single-aliquot regenerative-doseprotocol[J].Radiation Measurements,32(1):57—73.
Rees-Jones J.1995.Optical dating of young sediments using fine-grain quartz[J].Ancient TL,13(2):9—14.
Rittenour T M.2008.Luminescence dating of fluvial deposits:Applications to geomorphic,palaeoseismic andarchaeological research[J].Boreas,37:613—635.
Thomas P J,Reddy D V,Devender K,et al.2007.Optical dating of liquefaction features to constrain prehistoricearthquakes in Upper Assam,NE India:Some preliminary results[J].Quaternary Geochronology,2:278—283.
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