1985年帕米尔凸起东北缘乌恰7.1级地震沉积物的粗粒石英与细粒石英光学测年

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

Geochronometria Pub Date : 2017-11-23 DOI:10.1515/geochr-2015-0075

Huili Yang, Jie Chen, N. Porat, Tao Li, Wenqiao Li, Weipeng Xiao

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引用次数: 6

摘要

摘要研究了与地震有关的沉积物的光学测年，包括一个现代样品和三个1985年乌恰7.4级地震地表破裂期间挖掘的沟渠样品。结果表明，等效剂量（De）值随晶粒尺寸和De测定方法的不同而变化。现代样品的残余剂量为0.1ka（0.2−0.1+0.2$\bbegin｛array｝｛｝0.2_｛-0.1｝^｛+0.2｝\end｛array｝$Gy），用于石英单颗粒测量。只有1.5-3.6%的晶粒具有可检测的OSL信号。单颗粒石英的年龄与预期年龄相似。细粒石英的结果高估了De值，并且比单粒石英和粗粒石英小等分试样标准化生长曲线（SA-SGC）的年龄要老得多。单颗粒石英OSL测年可能是地震相关矿床测年的最佳方法，但SA-SGC可以节省测量时间，并有可能对一些漂白不良的样品进行测年。

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Coarse versus fine-grain quartz optical dating of the sediments related to the 1985 Ms7.1 Wuqia earthquake, northeastern margin of the Pamir salient, China

Abstract Optical dating of earthquake related sediments were investigated including one modern sample and three samples from a trench excavated across the 1985 Ms7.4 Wuqia Earthquake surface rupture. The results indicated that equivalent dose (De) values vary with grain size and the method used for De determination. The residual dose of the modern sample is 0.1 ka ( 0.2−0.1+0.2 $\begin{array}{} 0.2_{-0.1}^{+0.2} \end{array} $ Gy) for the quartz single grain measurements. Only 1.5–3.6% of the grains have a detectable OSL signal. Single grain quartz ages are similar to the expected ages. Fine grain quartz results overestimate the De values and are much older than single grain quartz and coarse grain quartz small aliquot standardized growth curve (SA-SGC) ages. Single grain quartz OSL dating may be optimal for dating earthquake related deposits, but SA-SGC can save measurement time and has potential for dating some poorly bleaching samples.

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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.