A detailed chronology has been obtained for a loess section at Yuanbao, situated at the northwestern edge of the Chinese Loess Plateau. The ages were obtained by the measurement of the optically stimulated luminescence (OSL) from coarse-silt-sized quartz grains. These ages showed that deposition at this site was continuous from 17 ka to the present, but that there was a decrease in the sedimentation rate from 0.60 to 0.10 m/ka at 13.489±1.15 ka, and this is proposed as the location of the Pleistocene/Holocene (P/H) boundary. A change in OSL sensitivity occurs at this depth. The depth and sharpness of this boundary is compared with the change obtained in low-field magnetic susceptibility (MS) measurements on 65 samples from the section. The MS changes gradually over 1.9 m and thus does not provide an easily discernible boundary. The new OSL-based sedimentation rates are used to calculate the mass accumulation rates for the Holocene and the end of the Pleistocene.
Alley, R. B. , Meese, D. A. , Shuman, C. A. , Gow, A. J. , Taylor, K. C. , Grootes, P. M. , White, J. W. C. , Ram, M. , Waddington, E. D. , Mayewski, P. A. and Zielinski, G. A.1993: Abrupt increase in snow accumulation at the end of the Younger Dryas event . Nature362, 527-529 .
2.
An, Z. S.2000: The history and variability of the East Asian paleomonsoon climate . Quaternary Science Reviews19, 171-187 .
3.
An, Z. S. and Porter, S. C.1997: Millennial-scale climatic oscillations during the last interglaciation in central China . Geology25, 603-606 .
4.
An, Z. S. , Kukla, G. J. , Porter, S. C. and Xiao, J. L.1991: Magnetic susceptibility evidence of monsoon variation on the Loess Plateau of central China during the last 130 000 years . Quaternary Research36, 29-36 .
5.
Bailey, R. M. , Bray, H. and Stokes, S.2003: Inductively-Coupled Plasma Mass Spectrometry (ICP-MS) for dose rate determination: some guidelines for sample preparation and analysis . Ancient TL21, 11-14 .
6.
Berger, G. W. , Mulhern, P. J. and Huntley, D. J.1980: Isolation of silt-sized quartz from sediments . Ancient TL11, 8-9 .
7.
Bøtter-Jensen, L. , Bulur, E. , Duller, G. A. T. and Murray, A. S.2000: Advances in luminescence instrumentation . Radiation Measurements32, 523-528 .
8.
Chen, F. H. , Wu, R. J. , Pompei, D. and Oldfield, F.1995: Magnetic property and particle size variations in the late Pleistocene and Holocene parts of the Dadongling loess section near Xining, China . Quaternary Proceedings4, 27-40 .
9.
Chen, F. H. , Ma, Y. Z. and Li, J. J.1996: High resolution record of Malan Loess in the Longxi Loess Plateau and rapid climate changes during the last glaciation (in Chinese) . Journal of Glaciology and Geocryology18, 111-118 .
10.
Chen, F. H. , Bloemendal, J. , Wang, J. M. , Li, J. J. and Oldfield, F.1997: High-resolution multi-proxy climate records from Chinese loess: evidence for rapid climatic changes over the last 75 kyr . Palaeogeography, Palaeoclimatology, Palaeoecology130, 323-335 .
11.
Chen, F. H. , Bloemendal, J. , Feng, Z. D. , Wang, J. M. , Parker, E. and Guo, Z. T.1999: East Asian monsoon variations during Oxygen Isotope Stage 5: evidence from the northwestern margin of the Chinese loess plateau . Quaternary Science Reviews18, 1127-1135 .
12.
Chen, J. , Ji, J. F. , Balsam, W. , Chen, Y. , Liu, L. W. and An, Z. S.2002: Characterization of the Chinese loess-paleosol stratigraphy by whiteness measurement . Palaeogeography, Palaeoclimatology, Palaeoecology183, 287-297 .
13.
Ding, Z. , Yu, Z. , Rutter, N. W. and Liu, T.1994: Towards an orbital time scale for Chinese loess deposits . Quaternary Science Reviews13, 39-70 .
14.
Derbyshire, E. , Keen, D. H. , Kemp, R. A. , Rolph, T. A. , Shaw, J. and Meng, X. M.1995: Loess-palaeosol sequences as recorders of palaeoclimatic variations during the last glacial interglacial cycle: some problems of correlation in north-central China . Quaternary Proceedings4, 7-18 .
15.
Fang, X. M. , Ono, Y. , Fukusawa, H. , Pan, B. T. , Li, J. J. , Guan, D. H. , Oi, K. , Tsukamoto, S. , Torii, M. and Mishima, T.1999: Asian summer monsoon instability during the past 60 000 years: magnetic susceptibility and pedogenic evidence from the western Chinese Loess Plateau . Earth and Planetary Science Letters168, 219-232 .
16.
Feng, Z.-D. , Wang, H.-B. and Olson, C. G.2004a: Pedogenic factors affecting magnetic susceptibility of the last interglacial palaeosol S1 in the Chinese Loess Plateau . Earth Surface Process and Landforms29, 1389-1402 .
17.
Feng, Z. D. , Wang, H. B. , Olson, C. , Pope, G. A. , Chen, F. H. , Zhang, J. W. and An, C. B.2004b: Chronological discord between the last interglacial paleosol (S1) and its parent material in the Chinese Loess Plateau . Quaternary International117, 17-26 .
18.
Heller, F. , Shen, C. D. , Beer, J. , Liu, X. M. , Liu, T. S. , Bronger, A. , Suter, M. and Bonani, G.1993: Quantitative estimates of pedogenic ferromagnetic mineral formation in Chinese loess and palaeoclimatic implications . Earth and Planetary Science Letters114, 385-390 .
19.
Imbrie, J. , Hays, J. D. , Martinson, D. G. , McIntyre, A. , Mix, A. C. , Morley, J. J. , Pisias, N. G. , Prell, W. L. and Shackleton, N. J.1984: The orbital theory of Pleistocene climate: support from a revised chronology of the marine δ18O record. In Berger, A. L. , Hays, J. D , Kukla, G. and Salzman, B. , editors, Milankovitch and climate, part 1. Reidel , 269-305.
20.
Jain, M. , Murray, A. S. and Bøtter-Jensen, L.2003: Characterisation of blue-light stimulated luminescence components in different quartz samples: implications for dose measurement . Radiation Measurements37, 441-449 .
21.
Kemp, R. A.2001: Pedogenic modification of loess: significance for palaeoclimatic reconstructions . Earth Science Reviews54, 145-156 .
22.
Kohfeld, K. E. and Harrison, S. P.2001: DIRTMAP: the geological record of dust . Earth Science Reviews54, 81-114 .
23.
Kohfeld, K. E. and Harrison, S. P.2003: Glacial-interglacial changes in dust deposition on the Chinese Loess Plateau . Quaternary Science Reviews22, 1859-1878 .
24.
Kukla, G.1987: Loess stratigraphy in central China . Quaternary Science Reviews6, 191-219 .
25.
Kukla, G. and An, Z.1989: Loess stratigraphy in Central China . Palaeogeography, Palaeoclimatology, Palaeoecology72, 203-225 .
26.
Kukla, G. , Heller, F. , Liu, X. M. and Xu, T. C.1988: Pleistocene climates in China dated by magnetic susceptibility . Geology16, 811-814 .
27.
Liu, Q. S. , Banerjee, S. K. , Jackson, M. J. , Chen, F. H. , Pan, Y. X. and Zhu, R. X.2004: Determining the climatic boundary between the Chinese loess and palaeosol: evidence from aeolian coarse-grained magnetite . Geophysical Journal International156, 267-274 .
28.
Liu, T. S.1985: Loess and the environment. China Ocean Press , 251-251 pp.
29.
Lu, H. Y. , Liu, X. D. , Zhang, F. Q. , An, Z. S. and Dodson, J.1999: Astronomical calibration of loess paleosol deposits at Luochuan, central Chinese Loess Plateau . Palaeogeography, Palaeoclimatology, Palaeoecology154, 237-246 .
30.
Maher, B. A. and Taylor, R. H.1988: Formation of ultrafine-grained magnetite in soils . Nature336, 368-370 .
31.
Maher, B. A. , Thompson, R. and Zhou, L. P.1994: Spatial and temporal reconstructions of changes in the Asian palaeomonsoon: a new mineral magnetic approach . Earth and Planetary Science Letters125, 461-471 .
32.
Martinson, D. G. , Pisias, N. G. , Hays, J. D. , Imbrie, J. , Moore, T. C. and Shackleton, N. J.1987: Age dating and orbital theory of the Ice Ages: development of a high-resolution 0 to 300 000 year chronostratigraphy . Quaternary Research27, 1-29 .
33.
Murray, A. S. and Wintle, A. G.2000: Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol . Radiation Measurements32, 57-73 .
34.
Murray, A. S. and Wintle, A. G.2003: The single aliquot regenerative dose protocol: potential for improvements in reliability . Radiation Measurements37, 377-381 .
35.
Porter, S. C.2000: High-resolution paleoclimatic information from Chinese eolian sediments based on grayscale intensity profiles . Quaternary Research53, 70-77 .
36.
Porter, S. C. and An, Z. S.1995: Correlation between climate events in the North Atlantic and China during the last glaciation . Nature375, 305-308 .
37.
Prescott, J. R. and Hutton, J. T.1994: Cosmic ray contributions to dose rates for luminescence and ESR dating: large depths and long-term time variations . Radiation Measurements23, 497-500 .
38.
Pye, K.1995: The nature, origin and accumulation of loess . Quaternary Science Reviews14, 653-667 .
39.
Rees-Jones, J.1995: Optical dating of young sediments using fine-grain quartz . Ancient TL13, 9-13 .
40.
Roberts, H. M. and Wintle, A. G.2001: Equivalent dose determination for polymineral fine-grains using the SAR protocol: application to a Holocene sequence of the Chinese Loess Plateau . Quaternary Science Reviews20, 859-863 .
41.
Roberts, H. M. , Wintle, A. G. , Maher, B. A. and Hu, M. Y.2001: Holocene sediment-accumulation rates in the western Loess Plateau, China, and a 2500-year record of agricultural activity, revealed by OSL dating . The Holocene11, 477-483 .
42.
Sun, J. M. , Kohfeld, K. E. and Harrison, S. P.2000: Records of aeolian dust deposition on the Chinese Loess Plateau during the Late Quaternary. Technical Reports, Max-Planck-Institut fur Biogeochemie, 318-318 pp.
43.
Watanuki, T. , Murray, A. S. and Tsukamoto, S.2003: A comparison of OSL ages derived from silt-sized quartz and polymineral grains from Chinese loess . Quaternary Science Reviews22, 991-997 .
44.
Wu, G. J. , Pan, B. T. , Guan, Q. Y. , Liu, Z. G. and Li, J. J.2002: Loess record of climatic changes during MIS5 in the Hexi Corridor, northwest China . Quaternary International97-98, 167-172 .
45.
Xiao, J. L. , Porter, S. C. , An, Z. S. , Kumai, H. and Yoshikawa, S.1995: Grain size of quartz as an indicator of winter monsoon strength on the Loess Plateau of central China during the last 130 000 yr . Quaternary Research43, 22-29 .
46.
Zhang, X. Y. , An, Z. S. , Chen, T. , Zhang, G. Y. , Arimoto, R. and Ray, B. J.1994: Late Quaternary records of the atmospheric input of eolian dust to the center of the Chinese Loess Plateau . Quaternary Research41, 35-43 .
47.
Zhou, L. P. , Oldfield, F. , Wintle, A. G. , Robinson, S. G. and Wang, J. T.1990: Partly pedogenic origin of magnetic variations in Chinese loess . Nature346, 737-739 .
48.
Zhou, W. J. , Dodson, J. , Head, M. J. , Li, B. S. , Hou, Y. J. , Lu, X. F. , Donahue, D. J. and Jull, A. J. T.2002: Environmental variability within the Chinese desert-loess transition zone over the last 20 000 years . The Holocene12, 107-112 .
