恒山北麓晚第四纪地貌及相关沉积物光释光定年
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摘要
恒山北麓地区晚第四纪地貌类型主要为冲-洪积台地、河流-冲沟阶地及同期冲-洪积扇，因此，晚第四纪沉积物类型主要为冲-洪积物。只要找到适合冲-洪积物类型沉积物的测年方法，就能获得该地区晚第四纪地貌相关沉积物的年龄。光释光测年的前提是样品在沉积埋藏之前经历充分的光晒退，而光晒退过程与沉积物沉积环境和沉积过程密切相关。本文选择连续的冲-洪积台地剖面进行粒度分析获得该地区冲-洪积物主要为粉砂和细砂，沉积环境和沉积过程不稳定，波动较大，剖面沉积物可能存在不均匀晒退导致部分层位样品不适合光释光测年。
针对冲-洪积物是否适合光释光测年的问题，本文开展一系列试验。选择恒山北麓地区发育古土壤的河流-冲沟阶地和冲-洪积扇系统采集样品，通过对代表性样品前处理、释光特性研究、预热坪试验，得到以下认识：经氟硅酸溶蚀三天后，长石基本溶蚀干净，也不含长石包裹体，石英的纯度完全满足光释光测年的要求。光释光信号以快速组分为主，符合单片再生法（SAR）和简单多片再生法（SMAR）测量的前提条件。并且得到本文样品光释光测年方法合适的预热条件：天然和再生剂量的预热温度为240℃，预热时间10s；试验剂量的预热温度为200℃，预热时间10s。通过对代表性样品细颗粒石英SMAR/SAR流程和中颗粒石英SAR流程中循环比率、回授率和剂量恢复检验，表明本文样品采用的等效剂量测试条件和流程合适，能有效校正测量过程中释光信号感量变化。
对几个河流-冲沟阶地和冲-洪积扇样品采用细颗粒石英SMAR/SAR法、中颗粒石英SAR法测年，并以AMS14C年龄为控制年龄，获得结论：石英光释光信号很容易归零，即使冲-洪积物沉积过程和沉积环境复杂，多数冲-洪积物的光释光信号在沉积埋藏前还是能够晒退到可忽略的水平，即使个别晒退不充分的样品，也可以利用中颗粒石英SAR流程累积频率法获得相对可靠的年龄，冲-洪积物是适合光释光测年的。
利用光释光方法和AMS14C方法对恒山北麓地区晚第四纪不同地貌面相关沉积物定年，获得该地区晚第四纪4级地貌面(T3、T2、T1、T0)相关沉积物的年龄分别为：30～40ka、5～8ka、2～4ka和2ka以来。
Late Quaternary geomorphological types in northern piedmont of the HengshanMountain are mainly composed of alluvial-diluvial platform, river-gully terrace andalluvial-diluvial fans formed in the same period. Late Quaternary sedment types aremainly alluvial-diluvial deposits. As long as we find suitable dating methods foralluvial-diluvial materials, we’ll obtain ages of sediments related to Late Quaternarygeomorphology in study areas. The premise of OSL dating is that the sample isbleached fully and OSL signals return to zero level before deposition and burial.Optical bleaching process is closely related to depositing environment and depositionprocess. We select a continuous alluvial-diluvial platform profile to sample for grainsize analysis. It shows that alluvial-diluvial deposits mainly consist of silt and finesand in the area. It’s depositing environment and process isn’t stable, fluctuations.Sediments may experience uneven bleaching and isn’t suitable for OSL dating insome layers in the profile.
Whether or not alluvial-diluvial materals are suitable for OSL dating? In order tosolve this problem a series of experiments are carried out in the paper. We chooseriver-gully terrace and alluvial-diluvial fans in which paleosoil are developed tosystematicly collect samples. Through pretreatment, luminescence characteristicsanalysis, preheat plateau tests on representave samples we conclude that feldspar isremoved and without feldspar inclusions if samples are treated for three days withH2SiF6. The quartz purity is enough for OSL dating. The main fast component isdominant in OSL signals and meet requirement of single aliquot regenerative-dose(SAR) and simplified multiple aliquot regenerative-dose (SMAR) measurement.Preheating conditions and dating methods appropriate for the samples in the paper aregotten. Preheat temperature of natural and regenerative dose is240℃and preheatingtime is10s. Accordingly preheat temperature of test dose is200℃and preheatingtime is10s. By recycling ratio, recuperation ration, dose recovery test onrepresentative samples in fine-grained quartz SMAR/SAR and medium-grained quartzSAR protocols the results show that equivalent dose test conditions and protocolsused for the samples in the paper are appropriate. It can effectively correct OSL signalsensitivities changes during measurements.
We carry out fine-grained quartz SMAR/SAR and medium-grained quartz SAR protocols for alluvial-diluvial samples collected from several river-gully terrace andalluvial-diluvial fans. Three osl ages are checked by AMS14C ages. The results showthat OSL signals can be bleached easily. Even if alluvial-diluvial depositingenvironment and process is complex, the majority of samles’ OSL signals are able tobe bleached to negligible levels before deposition and burial. We can also obtainrelatively reliable ages through the cumulative frequency method in medium-grainedSAR protocol even if individual samples experienced insufficient bleaching beforedeposition and burial. Allucial-diluvial deposits are suitable for OSL dating.
We date different geomprphology units sediments related to Late Quaternary inNorthern Piedmont of the Hengshan Mountain with OSL and AMS14C methods. Agesof four geomprphology units (T3、T2、T1、T0) are obtained. That is,30～40ka、5～8ka、2～4ka and since2ka.
针对冲-洪积物是否适合光释光测年的问题，本文开展一系列试验。选择恒山北麓地区发育古土壤的河流-冲沟阶地和冲-洪积扇系统采集样品，通过对代表性样品前处理、释光特性研究、预热坪试验，得到以下认识：经氟硅酸溶蚀三天后，长石基本溶蚀干净，也不含长石包裹体，石英的纯度完全满足光释光测年的要求。光释光信号以快速组分为主，符合单片再生法（SAR）和简单多片再生法（SMAR）测量的前提条件。并且得到本文样品光释光测年方法合适的预热条件：天然和再生剂量的预热温度为240℃，预热时间10s；试验剂量的预热温度为200℃，预热时间10s。通过对代表性样品细颗粒石英SMAR/SAR流程和中颗粒石英SAR流程中循环比率、回授率和剂量恢复检验，表明本文样品采用的等效剂量测试条件和流程合适，能有效校正测量过程中释光信号感量变化。
对几个河流-冲沟阶地和冲-洪积扇样品采用细颗粒石英SMAR/SAR法、中颗粒石英SAR法测年，并以AMS14C年龄为控制年龄，获得结论：石英光释光信号很容易归零，即使冲-洪积物沉积过程和沉积环境复杂，多数冲-洪积物的光释光信号在沉积埋藏前还是能够晒退到可忽略的水平，即使个别晒退不充分的样品，也可以利用中颗粒石英SAR流程累积频率法获得相对可靠的年龄，冲-洪积物是适合光释光测年的。
利用光释光方法和AMS14C方法对恒山北麓地区晚第四纪不同地貌面相关沉积物定年，获得该地区晚第四纪4级地貌面(T3、T2、T1、T0)相关沉积物的年龄分别为：30～40ka、5～8ka、2～4ka和2ka以来。
Late Quaternary geomorphological types in northern piedmont of the HengshanMountain are mainly composed of alluvial-diluvial platform, river-gully terrace andalluvial-diluvial fans formed in the same period. Late Quaternary sedment types aremainly alluvial-diluvial deposits. As long as we find suitable dating methods foralluvial-diluvial materials, we’ll obtain ages of sediments related to Late Quaternarygeomorphology in study areas. The premise of OSL dating is that the sample isbleached fully and OSL signals return to zero level before deposition and burial.Optical bleaching process is closely related to depositing environment and depositionprocess. We select a continuous alluvial-diluvial platform profile to sample for grainsize analysis. It shows that alluvial-diluvial deposits mainly consist of silt and finesand in the area. It’s depositing environment and process isn’t stable, fluctuations.Sediments may experience uneven bleaching and isn’t suitable for OSL dating insome layers in the profile.
Whether or not alluvial-diluvial materals are suitable for OSL dating? In order tosolve this problem a series of experiments are carried out in the paper. We chooseriver-gully terrace and alluvial-diluvial fans in which paleosoil are developed tosystematicly collect samples. Through pretreatment, luminescence characteristicsanalysis, preheat plateau tests on representave samples we conclude that feldspar isremoved and without feldspar inclusions if samples are treated for three days withH2SiF6. The quartz purity is enough for OSL dating. The main fast component isdominant in OSL signals and meet requirement of single aliquot regenerative-dose(SAR) and simplified multiple aliquot regenerative-dose (SMAR) measurement.Preheating conditions and dating methods appropriate for the samples in the paper aregotten. Preheat temperature of natural and regenerative dose is240℃and preheatingtime is10s. Accordingly preheat temperature of test dose is200℃and preheatingtime is10s. By recycling ratio, recuperation ration, dose recovery test onrepresentative samples in fine-grained quartz SMAR/SAR and medium-grained quartzSAR protocols the results show that equivalent dose test conditions and protocolsused for the samples in the paper are appropriate. It can effectively correct OSL signalsensitivities changes during measurements.
We carry out fine-grained quartz SMAR/SAR and medium-grained quartz SAR protocols for alluvial-diluvial samples collected from several river-gully terrace andalluvial-diluvial fans. Three osl ages are checked by AMS14C ages. The results showthat OSL signals can be bleached easily. Even if alluvial-diluvial depositingenvironment and process is complex, the majority of samles’ OSL signals are able tobe bleached to negligible levels before deposition and burial. We can also obtainrelatively reliable ages through the cumulative frequency method in medium-grainedSAR protocol even if individual samples experienced insufficient bleaching beforedeposition and burial. Allucial-diluvial deposits are suitable for OSL dating.
We date different geomprphology units sediments related to Late Quaternary inNorthern Piedmont of the Hengshan Mountain with OSL and AMS14C methods. Agesof four geomprphology units (T3、T2、T1、T0) are obtained. That is,30～40ka、5～8ka、2～4ka and since2ka.
引文
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[2] Aitken M J, Smith B W. Optical dating: recuperation after bleaching. Quaternary ScienceReviews,1988,7:387～393
[3] Aitken M J, An Introduction to Optical Dating [M]. London: OXFORD UniversityPress,1998,39～44
[4] Aitken M J, J Xie, Optical dating using infrared diodes: young samples. QuaternaryScience Reviews,1992,11:147～152
[5] Berger G W, Effectiveness of nature zeroing of the thermoluminescence in sediments [J].Journal of Geophyscial Research,1990,95(B8):12375～12397
[6] Clarke M L, Rendell H M, Wintle A G, Quality assurance in luminescence dating.Geomorphology,1999,29:173～185
[7] Duller G A T, Equivalent dose determination using single aliquots[J].Nuclear Tracks andRadiation Measurements,1991,18:371～378
[8] Duller G A T, A G Wintle, Hall A M, Luminescence dating and its application to keypre-Late Devensian sites Scotland. Quaternary Science Reviews,1995,14:495～519
[9] Duller G A T, Luminescene dating using single aliquot:methods and applications,Radiation Measurements,1995,24:217～226
[10]Duller G A T, Luminescence dating using single aliquots: new procedures. QuaternaryScience Reviews,1994,13:149～156
[11]Galloway R B, Equivalent dose determination using only one sample: alternative analysisof data obtained from infrared stimulation of feldspars, Radiation Measurements,1996,26:103～106
[12]Godfrey-Smith D I, Huntley D J, Chen W H, Optical dating studies of quartz and feldsparsediment extracts. Quaternary Science Reviews,1988,7:373～380
[13]Huntley D J, Godfrey-Smith D I, Thewalt M L W, Optical dating of sediments. Nature,1985,313:105～107
[14]Hütt G, Jaek I, Tchonka J, Optical dating:K-feldspars optical response stimulationspectra[J]. Quaternary Science Reviews,1988,7:381～385
[15]Jacobs Z, Duller G A T, Wintle A G, Interpretation of single grain De distributions andcalculation of De. Radiation Measurements,2006,41:264～277
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