• Title, Summary, Keyword: OSL 연대 측정

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Revisiting the OSL Ages of Marine Terrace Sediments at Suryum Fault Site, Gyeongju, South Korea: Single Grain OSL Dating (수렴단층노두 해안단구 퇴적층의 OSL 연대에 대한 재고찰: 단일입자 OSL 연대측정 연구)

  • Heo, Seoyoung;Choi, Jeong-Heon;Hong, Duk-Geun
    • The Journal of the Petrological Society of Korea
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    • v.23 no.3
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    • pp.187-195
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    • 2014
  • In this paper, we report new OSL ages of the marine terrace sediments at Suryum fault site, using single grains of quartz, and briefly discuss their chronological implications on the timing of terrace formation along the southeastern coast of Korea. Of 1200 grains measured, 93 quartz grains were found to have OSL properties suitable for dating, the equivalent dose ($D_e$) values of which varied significantly, ranging from 50 Gy to 610 Gy with the overdispersion of $30{\pm}4%$. Applied to the Central Age Model (CAM) and Minimum Age Model (MAM), these quartz grains showed the OSL ages of $83{\pm}4ka$ and $60^{+3}{_{-7}}ka$, respectively, both of which are stratigraphically inconsistent with the previously reported OSL ages of lower $2^{nd}$ terrace (MIS 5a; ~80 ka). However, Finite Mixture Model (FMM) revealed that a small fraction of the measured quartz grains ($6{\pm}4%$) were of the ages ($194{\pm}24ka$) corresponding to MIS 7. Conclusively, based on single grain OSL ages, it would be prudent not to exclude the possibility that the marine terrace sediments at Suryum fault site have formed during MIS 7. Further, our single grain OSL ages imply that multiple grain(single aliquot) OSL dating methods are not applicable to the marine sediments at Suryum fault site.

OSL Age Determination of the Hearths in a Bronze Age Dwelling Site by using Bayesian Statistics (베이지안 통계학을 이용한 청동기시대 주거지내 화덕자리들의 광자극발광(OSL) 연대 결정)

  • Kim, Myung-Jin;Yang, Hye-Jin;Hong, Duk-Geun
    • Journal of Radiation Protection and Research
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    • v.36 no.2
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    • pp.52-58
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    • 2011
  • OSL dating for three hearths having the sequence of use and discard in No. 29 and 29-1 dwelling sites at Sogol cultural site was carried out. Resulting from the deconvolution of natural CW-OSL decay curve and thermal zeroing test, it was turned out that OSL signal was entirely composed of the heat- and light-sensitive fast component with high photoionization cross-section and all quartz OSL signals were thermally bleached under $300^{\circ}C$ which is the minimum temperature related to heating and cooking in Bronze age. After dose recovery test and plateau test, paleodose of each hearth sample was evaluated by using SAR method, and OSL age was determined from the ratio of paleodose to annual dose rate. For the purpose of the precision improvement of OSL age, Bayesian statistics was applied to each hearth's age and the archaeological sequence information. Finally, it could be concluded to the accurate use period of each hearth from the resultant OSL ages.

남제주 사람 발자국 화석의 생성 연대

  • Kim, Gyeong-Su;Kim, Jeong-Ryul
    • 한국지구과학회:학술대회논문집
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    • pp.154-157
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    • 2005
  • 제주도 남제주군 사계리 해안에서 발견된 사람과 각종 동물 발자국 화석의 생성 연대를 규명하기 위하여 문화재청에서 한국지질자원연구원에 연구 용역을 의뢰하여, 사람 발자국 화석이 산출되는 지층에서 유기물의 탄소동위원소 연대 측정과 광여기루미네선스(Optically Stimulated Luminescence, OSL) 연대 측정을 실시하였다. 그 결과, Humin 유기물에 대한 탄소동위원소 측정값은 상부로부터 $10,901{\pm}60$년, $13,513{\pm}65$년 그리고 $15,161{\pm}70$년이고, Humic 유기물에 대한 탄소동위원소 측정값은 $9,289{\pm}90$년, $8,622{\pm}90$년 및 $8,098{\pm}50$년 이며, OSL 연대 측정 방법에 의하면 $6,800{\pm}300{\sim}7,600{\pm}500$년이다. 이 측정 자료에서 한국지질자원연구원은 탄소동위원소에 의한 측정값은 배제하고, OSL 연대 측정값인 $6,800{\pm}300{\sim}7,600{\pm}500$년을 사람 발자국 화석의 생성 연대로 해석하였다. 그러나 Humin 유기물에 의한 탄소동위원소 측정값을 배제한 가장 중요한 이유로 Humin 유기물이 산성 또는 알칼리에 잘 녹지 않기 때문에 재순환되어 발자국 화석이 생성될 당시 외부에서 유입되어 더 오래된 연대값을 나타낸다고 주장하였는데, 이러한 주장은 아무런 근거가 없다. 또한 송악산의 분출이 약 10,000년 이내에 분출하였다는 명확한 근거가 없으며, 석영을 이용한 OSL 연대 측정은 연대를 결정하기 위해 고려되는 여러 요소들에 수반되는 불확실한 요소(예를 들면, 수분 함량 문제 등)들로 인해 탄소동위원소 연대 측정에 비해 정밀도와 정확도가 낮으며, 특히 화산 기원 석영의 경우, 정확한 등가선량의 측정이 어렵기 때문에 연대 측정에 오류가 발생할 수 있음이 잘 알려져 있고, 주변의 화산 활동으로 인한 열수에 의해 OSL 신호가 영향을 받을 수 있는 가능성을 배제할 수 없다. 따라서 현재의 연대 측정 결과만으로 사람 발자국 화석의 생성 연대를 결정하는 데 가장 신뢰성이 있는 자료는 Humin 유기물에 의한 탄소동위원소 연대 측정값이며, 이를 근거로 할 때, 사람 발자국 화석의 생성 연대는 $13,513{\pm}65{\sim}15,161{\pm}70$년 사이로 보는 것이 가장 합리적이고 타당하다.

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The Development of Earthenware Kilns in Bongsan-ri Archaeological Site, Osong: Implications for Pre- and Post-1950 AD Absolute Age Determination (AD 1950년 전후 고고유적의 절대연대측정에 대한 고찰: 오송 봉산리 옹기가마 유적을 중심으로)

  • Kim, Myung Jin;Son, Myoung Soo;Kim, Tae Hong;Sung, Ki Seok
    • Journal of Conservation Science
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    • v.34 no.6
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    • pp.481-492
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    • 2018
  • We conducted TL/OSL dating for the earthenware kilns in the Bongsan-ri archaeological site, Osong, which was occupied from the late nineteenth to the late twentieth century. With the SAR-TL/OSL method, paleodose was determined from the equivalent dose during the burial period($ED_{burial}$), the background dose($ED_{BG}$), the fading correction factor(f), and the overestimation correction factor(C). The annual dose rates and their provenance were evaluated from the measurement of natural radionuclides $^{238}U$, $^{232}Th$, and $^{40}K$. Because the comprehensive absolute age was provided by combining the resulting TL/OSL and radiocarbon data, we concluded that, for the absolute chronology of a modern archaeological site, TL/OSL dating and radiocarbon dating must be carried out together and summed. The construction and occupation of earthenware kilns in the Bongsan-ri site had changed from stage I (No.5, 6 kilns), to stage II (No.1, 2, 3 kilns), to stage III (No.4) in chronological order. When Bayesian statistics were applied, we found that the absolute ages of occupation for stages I, II, and III correspond to AD $1910{\pm}23$, AD $1970{\pm}10$, and AD $1987{\pm}4$. These results were in good agreement with the archaeological context or chronology.

Applications of OSL method in Archeology (OSL 연대측정법의 고고학적 적용)

  • Yang, Dong-Yoon;Kim, Ju-Yong;Shin, Sook-Chung
    • The Korean Journal of Quaternary Research
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    • v.20 no.1
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    • pp.28-38
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    • 2006
  • Since the radioactivity of U was discovered by Becquerel in 1896, a number of radiometric dating techniques based on radioactive decay have been developed with the help of precise and accurate instruments. Among them, radiocarbon dating was introduced as the most effective method in archeology in Korea. However, though the radiocarbon methods have contributed greatly to the development of archeology in Korea, it is limited to organics in a matrix of soil and sediment, including organic carbon, charcoal, bone and so on. If there are no organics in some paleolitic sites, other methods are required for dating. Therefore, we introduced OSL (Optically Stimulated Luminescence) dating method in this paper. The method is mainly based on quartz grains or other particles. The aim of this paper is to discuss about sampling method and the limitation of its application in archeology.

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Evaluation of construction era of Pungnabtoseong earthen wall, Seoul by using OSL dating (OSL 연대측정을 통한 풍납토성 축조연대 산출)

  • Kim, Myung-Jin
    • Analytical Science and Technology
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    • v.25 no.5
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    • pp.324-332
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    • 2012
  • Construction era of Pungnabtoseong earthen wall is one of the most popular controversial issues in Korean archaeological research. For the evaluation of construction era, OSL dating was carried out using seven pottery pieces collected in each construction stage. From TL/OSL characteristics, and the results of absolute zeroing test and recovery test, it was proved that the pottery samples were completely bleached. The reliable paleodose was evaluated by using the SAR method with preheat at $220^{\circ}C$, and the pottery OSL age was determined from the ratio of paleodose to annual dose rate. Considering the resultant OSL ages, archaeological context and the related 14C ages, the first construction era was determined as $294{\pm}52$ yrs AD ($1{\sigma}$ SE). Also we found that the enlargement of construction stage III was $328{\pm}30$ yrs AD ($1{\sigma}$ SE) and final construction was finished within $400{\pm}76$ yrs AD ($1{\sigma}$ SE). Therefore, it is suggested that the construction of Pungnabtoseong earthen wall was firstly started in the late $3^{rd}$ century AD and several enlargements and repairs had been carried out, before the transfer of the capital of Baekje dynasty to Woongjin (Gongju) at 475 AD.

Evaluation of the formation and occupation of Gosan-ri archaeological site in Jeju Island using OSL dating (OSL 연대측정을 통한 제주 고산리 유적의 형성과 점유시기 결정)

  • Kim, Myung-Jin
    • Analytical Science and Technology
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    • v.29 no.6
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    • pp.269-276
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    • 2016
  • Gosan-ri site is known as the early Neolithic cultural heritage, in which an archaic plainware, called as the Gosan-ri-type pottery, was excavated regarding as the first pottery manufactured in Korea. In this study, OSL dating was carried out to five soil layer samples collected in stratigraphic cross-section for evaluating the formation and occupation of the Gosan-ri site. Paleodose of each soil sample was calculated using the single aliquot regenerative dose (SAR) method with preheat of $220^{\circ}C$ and finally determined using maximum age model, considering its deposition process. The OSL age was determined from the ratio of paleodose to annual dose rate. From the resultant OSL ages and the related 14C dates, it was concluded that the Gosan-ri site was formed after 9,000 BC and a variety of cultural feature including the Gosan-ri-type pottery were occupied ranging from the early Neolithic to the middle of 4,000 BC. Finally, the Gosan-ri site was discarded in the middle of 4,000 BC and has been arrived at present through natural deposits.

Application of Potassium Feldspar pIR-IRSL Method to Dating Quaternary Marine and Fluvial Terrace Sediments in Korea: A Case Study on a Fluvial Terrace and Gusan Fault in Uljin, Korea (한반도 해안-하안단구 퇴적층에 대한 K 장석 pIR-IRSL연대측정법 적용가능성 고찰: 울진 하안단구와 구산단층 연대측정)

  • Hong, Seongchan;Choi, Jeong-Heon
    • The Journal of the Petrological Society of Korea
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    • v.25 no.3
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    • pp.241-252
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    • 2016
  • In this paper, in order to test the possibility of applying K feldspar $pIR-IRSL_{290}$ signal(read out at $290^{\circ}C$) to date old terrace sediments(up to ~ 200 ka, MIS 7) in Korea, we investigated luminescence properties of $pIR-IRSL_{290}$ signals in K feldspar extracts from 27 marine and fluvial terrace sediment samples, and these were compared with those of quartz OSL and conventional K feldspar $IRSL_{50}$ (readout at $50^{\circ}C$) signals. The averaged $2D_0$ value of K feldspar $pIR-IRSL_{290}$ growth curves was ~ 700 Gy, which is consistent with that of $IRSL_{50}$ signal, and this is 3 times higher than that for quartz OSL (~ 250 Gy) on average. Where possible, K feldspar $pIR-IRSL_{290}$ ages were compared with quartz OSL and conventional $IRSL_{50}$ ages. Our preliminary K feldspar $pIR-IRSL_{290}$ ages were older than quartz OSL ages by about 200%, while fading rate-corrected conventional $IRSL_{50}$ ages are in good agreement with those based on quartz OSL. This seems to indicate the possibility of K-feldspar $pIR-IRSL_{290}$ age overestimation due to the presence of unbleachable $pIR-IRSL_{290}$ signals, even with a prolonged exposure to sunlight. Both quartz OSL and K-feldspar $pIR-IRSL_{290}$ signals for the samples from Noeum fluvial terrace and Gusan fault site were all in dose saturation level, thus unable to estimate the formation ages of the sediments. However, $2D_0$ values derived from the dose response growth curves strongly indicate that the Noeum fluvial terrace sediments have formed before 109-140 ka, while the fluvial sediments from Gusan fault were desposited before 100-105 ka. Further, this seems to suggest that the previous quartz OSL ages of ~40-50 ka for Gusan fault sediments should be the underestimated ones due to dose saturation problem.

Optical dating of Quaternary sediment (광 여기 루미네센스를 이용한 신기 퇴적층의 연대측정)

  • 홍덕균;최정헌;한정희;최만식;정창식
    • The Journal of the Petrological Society of Korea
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    • v.10 no.3
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    • pp.202-211
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    • 2001
  • Luminescence is a physical phenomenon exhibited by many non-conducting, crystalline materials, such as quartz and feldspar. Within the crystals, energy absorbed from ionising radiation frees electrons to move through the crystal lattice and some are trapped at defects in the lattice. Observable luminescence is produced by electrons, released from traps by stimulation by absorption of light, which recombine with lattice defects which act as luminescence centers - optically stimulated luminescence (OSL). In a similar way to thermoluminescence(TL) dating, controlled measurement of the OSL signal can provide a means of determining the time since the last exposure of a layer of sediment to sunlight, the age of the sediment. However, whereas in the thermoluminescence dating of sediment only part of the latent thermoluminescence signal is bleached by sunlight as the sediment is deposited and allowance must be made during the laboratory measurements for the light insensitive component, optically induced luminescence dating has the advantage of working only with light sensitive traps in the crystal. Determination of the time since deposition of Quaternary sediment samples from the OSL of quartz grains using blue light was performed. A series of experiments and recent developments relating OSL dating are described, beginning by identifying the features which make OSL signals suitable for the development of dating method. Additionally, there are suggestions as to future research for obtaining reliable ages and a comment on current best practice on procedures, with the dating results of Quaternary sediment.

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Trace Element Compositions and Optically Stimulated Luminescence Characteristics of Sedimentary Quartz (퇴적물 내 석영의 광여기 루미네선스 특성과 미량원소 조성)

  • Jeon, Gi-Young;Choi, Jeong-Heon;Kil, Young-Woo
    • Journal of the Mineralogical Society of Korea
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    • v.23 no.4
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    • pp.357-365
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    • 2010
  • Optically stimulated luminescence (OSL) of quartz is commonly applied to the age dating of Quaternary sediments. However, one of the issues is that some of the quartz samples are not suitable to OSL dating. Mineralogical analysis of the quartz samples with diverse OSL signals are required to strengthen the reliability and applicability of the OSL dating. We analysed the OSL signal characteristics of sedimentary quartz samples from diverse geological environments and measured their trace element contents using laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Quartz samples could be grouped into ones suitable to OSL dating and ones unsuitable on the basis of their OSL signal characteristics. The average trace element contents ranged from 73 to 260 ppm (Al), and from 61 to 248 ppm (Ti) with minor Li, Mg, Cr, Mn, and Fe contents below 40 ppm. We did not find any significant variation of trace element contents of quartz samples consistent with their OSL signal characteristics. This indicates unknown mineralogical factors causing diverse OSL characteristics which should be confirmed by further analysis of sufficient set of samples.