Isochron dating of sand-loess-soil deposits from the Mu Us Desert margin, central China

Li, Bo; Li, Sheng‐Hua; Sun, Jimin

doi:10.1016/j.quageo.2011.08.004

Cited by 11 publications

(8 citation statements)

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“…Samples RUP-1, -2 and -3 were collected from Late Pleistocene sediments at Nyamita 2, and samples RUP-4 and RUP-5 are from Wakondoboth of these sites being located in Lake Victoria basin, Kenya (Blegen et al, 2015). An aeolian sand sample (Sm5) was collected from the Shimao section on the southeastern margin of the Mu Us Desert, central China (Sun et al, 1999;Li et al, 2011Li et al, , 2013Li et al, , 2014b. Samples Enderby-OSL1, -OSL2, -OSL3 and -OSL4 were collected from the Enderby Island, New Zealand.…”

Section: Sample Descriptionsmentioning

confidence: 99%

Single-grain dating of potassium-rich feldspar grains: Towards a global standardised growth curve for the post-IR IRSL signal

Jacobs

2018

Quaternary Geochronology

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Potassium-rich feldspar (K-feldspar) grains were extracted from 28 sediment samples from sites in Asia, Europe and Africa and the dose response curves-or growth curves-were constructed from the postinfrared infrared stimulated luminescence (pIRIR) signals emitted by individual grains. The samples exhibit large between-grain variation in both pIRIR signal intensity and the shape of the corresponding growth curves; the latter can be largely explained as a result of measurement uncertainties, including counting statistics and instrumental irreproducibility. This between-grain variation can be reduced by applying a least-squares normalisation (LS-normalisation) procedure, which allows a common growth curve-or global standardised growth curve (gSGC)-to be established for individual K-feldspar grains from the range of samples investigated. Equivalent dose (D e) values for single grains can be estimated using the fitting parameters of the gSGC, together with measurements of the natural signal (L n), one regenerative-dose signal (L x) and their corresponding test-dose signals (T n , T x). The D e values obtained using the gSGC approach are consistent at 2σ with those obtained from the individual growth curves constructed for each of the grains. The establishment of a gSGC greatly reduces the time required to measure a large number of grains for old samples, and it also overcomes the problem of D e underestimation that can occur using a full single-aliquot (or single-grain) regenerative-dose (SAR) procedure when a large number of grains are rejected due to issues of 'saturation'. The construction of a gSGC may, therefore, potentially extend the dating range of pIRIR signals beyond the reliable limit of D e estimation using the standard SAR method.

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Section: Sample Descriptionsmentioning

confidence: 99%

Single-grain dating of potassium-rich feldspar grains: Towards a global standardised growth curve for the post-IR IRSL signal

Jacobs

2018

Quaternary Geochronology

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“…Sample DGF-1 is a lacustrine sediment taken from the southern edge of the Mu Us Desert (MUD) in central China, and has been studied previously by Li and Li (2006). HLD-3 is a sample of dune sand taken from He Er Hong De in the Hulun Buir Desert (HBD) in northeast China (Li et al, 2002), and Sm5 is a dune sediment from the Shimao section on the southeastern margin of the Mu Us Desert (Sun et al, 1999;Li et al, 2011). MS-5450 is a Chinese loess sample collected at Mangshan in Henan, and two additional loess samples, TB-8 and TB-10, originate from Tibet (Sun et al, 2007).…”

Section: Sample Descriptionsmentioning

confidence: 99%

Potential of establishing a ‘global standardised growth curve’ (gSGC) for optical dating of quartz from sediments

Roberts

Jacobs

et al. 2015

Quaternary Geochronology

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“…Thus, more than 400 OSL ages have been obtained [18,[34][35][36][37][38][39][40][41][42][43][44]; at the same time, the grain size distribution, magnetic susceptibility and organic matter content were measured. As a total, more than 100 depositional sections were analyzed, plus the previous published ages [8,10,11,21,[45][46][47][48][49][50][51][52][53][54][55][56][57] that can be used to identify sediments deposited in the LGM and HO, to provide estimation of the borders of the deserts and sand fields during that time (Figure 4 and Table 1) [32].…”

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Chinese deserts and sand fields in Last Glacial Maximum and Holocene Optimum

et al. 2013

Chin. Sci. Bull.

111

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The Last Glacial Maximum (LGM, and the Holocene Optimum (HO, c. 9-5 ka) were characterized by cold-dry and warm-wet climates respectively in the recently geological Earth. How Chinese deserts and sand fields responded to these distinctive climatic changes is still not clear, however. To reconstruct environments of the deserts and sand fields during the LGM and HO is helpful to understand the forcing mechanisms of environment change in this arid region, and to test paleoclimatic modeling results. Through our long-term field and laboratory investigations, 400 optically stimulated luminescence (OSL) ages and more than 100 depositional records in the Chinese deserts and sand fields were obtained; on the basis of these data, we reconstruct spatial distributions of the deserts and sand fields during the LGM and HO. Our results show that the sand fields of Mu Us, Hunshandake, Horqin and Hulun Buir in northern and northeastern China had expanded 25%, 37%, 38% and 270%, respectively, during the LGM; the sand fields of Gonghe in the northeastern Qinghai-Tibetan Plateau had expanded 20%, and the deserts of Badain Jaran, Tengger in central northern China had expanded 39% and 29% separately during the LGM; the deserts of Taklimakan, Gurbantünggüt and Kumtag in northwestern China had expanded 10%-20% respectively, compared to their modern areas. On the other hand, all of the sand fields were nearly completely covered by vegetation during the HO; the deserts in northwestern and central northern China were reduced by around 5%-20% in area during this time. Lakes in this arid region were probably expanded during the HO but this conclusion needs more investigation. Compared with the geological distributions of deserts and sand fields, human activity has clearly changed (expanded) the area of active sand dunes at the present time. Our observations show that environmental conditions of Chinese deserts and sand fields are controlled by regional climate together with human activity. deserts and sand fields in China, Last Glacial Maximum, Holocene Optimum, OSL dating, active sand dunes Citation:

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Isochron dating of sand-loess-soil deposits from the Mu Us Desert margin, central China

Cited by 11 publications

References 50 publications

Single-grain dating of potassium-rich feldspar grains: Towards a global standardised growth curve for the post-IR IRSL signal

Single-grain dating of potassium-rich feldspar grains: Towards a global standardised growth curve for the post-IR IRSL signal

Potential of establishing a ‘global standardised growth curve’ (gSGC) for optical dating of quartz from sediments

Chinese deserts and sand fields in Last Glacial Maximum and Holocene Optimum

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