Radiocarbon And OSL Dating On Cores From The Chaoshan Delta In The Coastal South China Sea

Radiation Measurements 32, 57-73. Exposure to light reduces the Optically stimulated Luminescence signal from quartz and provides the basis for dating the event of light exposure and thus the sedimentation. 2) Lake level subsequently dropped about 20 m since 9.2 ka and probably remained at this level (+35 m) from about 8 to 5 ka, with slight fluctuations. A dry condition and reduced runoff should be the main reason for lake shrinkage. Lake level further dropped another 40 m in the late Holocene. Thermoluminescence was first clearly described in a paper presented to the Royal Society in 1663, byRobert Boyle, who described the effect in a diamond which had been warmed to body temperature.

Res. 59, 411–419 . Jenkins, G. T. H., Duller, G. A. T., Roberts, H. M., Chiverrell, R. C. & Glasser, N. F. A new approach for luminescence dating glaciofluvial deposits — High precision optical dating of cobbles. Rev. 192, 263–273 . Simms, A. R., DeWitt, R., Kouremenos, P. & Drewry, A. M. A new approach to reconstructing sea levels in Antarctica using optically stimulated luminescence of cobble surfaces. 6, 50–60 .

Optically stimulated Luminescence dating of quartz

By extension, that same date should be evidenced deep within all Carolina bay structures. The failure thus far to identify a unique date has been problematic for any catastrophic theory, and is used to defend a gradualist genesis. Without exception, the sands in question have failed to yield a date based on fossil evidence, as they are entirely unfossilifirous. Daniels’ granted a marine geomorphology to his Goldsboro Ridge deposit, but rightly mentioned in passing that the lack of fossil evidence was problematic for that solution.

Reduced gases released from hydrothermal vents supply energy to local deep-marine ecosystems and play an important role in global biogeochemical cycles of sulfur and carbon. The habitable, lower-temperature diffuse flow sites in a hydrothermal system generally have higher biomass than focused flow sites. However, a scarcity of observational data of diffuse flows limits our understanding of the role of volatile gases in these environments.

OSL Chronology

The measured water content for cores ZK001 and ZK002 range between 7.4% and 40.5% and between 8% and 18.2%, respectively. Yet, the measured water content cannot accurately reflect the real water content of the sediments at the time of burial. Therefore, based on the variation of water content within the burial period in the study region, we estimated the water content to be 25% ± 5% for all OSL samples in this study instead of using the measured water content. To establish a chronological framework for the sites and mortuary activity we present radiocarbon dates from Site 2 , and compare these with those previously obtained from Site 1 . In an effort ascertain when the megaliths were placed in the landscape, sediment samples beneath the megaliths at Site 2 and Site 52 were subjected to Optically Stimulated Luminescence dating.

Srivastava, P., Juyal, N., Singhvi, A. K. & Wasson, R. J. Luminescence chronology of river adjustment and incision of Quaternary sediments in the alluvial plain of the Sabarmati River, north Gujarat, India. Geomorphology 36, 217–229 . Wang, X. L., Lu, Y. C. & Wintle, A. G. Recuperated OSL dating of fine-grained quartz in Chinese loess.

And Sala, R. 2015.Extended-range luminescence chronologies suggest potentially complex bone accumulation histories at the Early-to-Middle Pleistocene palaeontological site of Huéscar-1 (Guadix-Baza basin, Spain). Quaternary International, Vol. 389, Issue. Turner, Derek G. Ward, Brent C. Bond, Jeffrey D. Jensen, Britta J.L. Froese, Duane G. Telka, Alice M. Zazula, Grant D.

“Optical dating” typically refers to OSL and IRSL, but not TL. Guo L., Wang P., Zhang K., Sheng Q., Zhao H., Wang C. OSL and 14C ages of the late quaternary sediments in the east pearl river delta. Geology China 40 , 1842–1849. The megalithic sites of Laos have seen sporadic efforts in archaeological research since the 1930s, with more recent excavations at three of the main sites, namely Sites 1, 2 and 52. This research has created a deeper understanding of the prehistoric and historic cultures of Xieng Khouang Province.

410, 11–29 . Arnold, L. J., Bailey, R. M. & Tucker, G. E. Statistical treatment of fluvial dose distributions from southern Colorado arroyo deposits. 2, 162–167 . Burbidge, C. I., Duller, G. A. T.

Chawla, S. & Singhvi, A. K. Thermoluminescence dating of archaeological sediments. Naturwissenschaften 76, 416–419 . Bailey, R. M., Yukihara, E. G. & McKeever, S. W. S. Separation of quartz optically stimulated luminescence components using green stimulation. 46, 643–648 .

Exploring the method of optical dating and comparison of optical and 14C ages of Late Weichselian coversands in the southern Netherlands. J. Quat. 19, 73–86 . Guérin, G. C.

The first episode of soil redeposition took place around 9.1 ka. The denudation events that followed were attributed to the Neolithic (6.4 ± 0.3 ka), early Bronze Age (3.8 ± 0.2 ka), early and late Middle Ages (1.5 ± 0.1 ka and 0.7 ± 0.03 ka, respectively) and early Modern (0.4 ± 0.02 ka). As a consequence of the denudation processes, the soil cover in the studied area had been strongly reshaped. The predominant Luvisols had experienced progressive erosion processes that led first to a significant shallowing of the eluvial and argic horizons and, after some time, to their complete removal. Further thinning of the loess mantles had exposed geological substrates with very weak pedogenic alternations, thus pushing their transformation towards Regosol types. Similarly, Regosols occurred in toeslopes where freshly eroded material had been deposited, and where diagnostic horizons had not yet developed.

One K-feldspar sample from DZ-S3-3 yields an age of 5.0 ± 0.2 ka, which is consistent with its quartz age of 4.8 ± 0.2 ka. The results of these four samples suggest a high lake level of +40 m in the middle Holocene. Compared with those of S1, the results clearly show that lake level rapidly dropped about 20 m since 9.2 to 5–6 ka. A proxy study from Dagze Co also suggests relatively high lake water salinity, reduced runoff, and a dry environment during the early to middle Holocene (Hou et al., 2017).

Under each preheating temperatures, six aliquots were measured. A plateau was observed between 200 and 260°C , and we selected a preheat condition of 240°C for natural/regenerative dose measurement and a cut heat of 200°C for test dose measurement. Dose recovery tests were also performed on the same sample, and the results indicated that the ratio of measured to given dose was in the range of 1.0 ± 0.1 .

Tags: No tags

Comments are closed.