Quartz OSL and K-feldspar post-IR IRSL dating of sand accumulation in the Lower Liao Plain (Liaoning, NE China)

Abstract

Abstract:The timing of the formation of extensively distributed sand dunes in the Bohai coastal area and its forcing factors are poorly understood. In this study, the chronology of a well-preserved sand dune located in Panjin Forest Park (PJ) in the Lower Liao Plain (LLP) is investigated using quartz optically stimulated luminescence (OSL) and K-feldspar postinfrared (IR) infrared stimulated luminescence (IRSL) (pIRIR) dating. For the pIRIR measurements, the combination of preheating at 180°C and pIRIR stimulation at 150°C (pIRIR 150 ) is exploited. The quartz results show that the sand dune accumulated from c. 120 a (1890 AD) to c. 70 a (1940 AD) before present, and the underlying sandy soil sediments deposited from c. 5.0 ka to c. 0.13 ka as marsh sediment after the sea level highstand since the mid-Holocene. From the evidence in historical coastline records, the PJ sand dune is an inland sand dune and not a coastal sand dune. Based on further information of climate and temperature change after the Little Ice Age (LIA) and human activity in northeastern China, we conclude that the PJ sand dune accumulation was very likely impacted by the immigrants and land reclamation at the end of Qing dynasty. The fading corrected IR 50 ages, the apparent and fading corrected pIRIR 150 ages are consistent with quartz ages for two sandy soil samples but overestimate those for six sand samples. The overestimation of the feldspar ages is derived from the residual signal which has not been bleached before burial. The offset obtained from the difference between the quartz OSL and the feldspar pIRIR 150 ages are ~20-160 a (predicted residual dose: ~0.08-0.60 Gy), whereas the measured residual dose after bleaching 4 h in a solar simulator yielded age overestimation of ~10-40 a (~0.05-0.16 Gy). The age discrepancy calculated from the predicted residual was larger than those obtained from the laboratory measured residuals. We conclude that the pIRIR 150 of aeolian sediment is applicable for samples older than ~1000 years where the effect of the residual dose become negligible.

Single-grain feldspar luminescence chronology of historical extreme wave event deposits recorded in a coastal lowland, Pacific coast of central Japan

“…The agreement of the luminescence ages with independent age estimates, and the low residual doses seen in the two beach samples (0.03 ± 0.01 Gy for JSH-MOD3 and 0.12 ± 0.02 Gy for JSH-MOD4, Table 3) implies that when using the IRSL 50 (pre-IR 130 ) signal from single grains, residual signals and thermal transfer are not major impediments (cf. Li et al, 2017).…”

“…The fast component of the OSL signal from quartz bleaches more rapidly than any other luminescence signal routinely used for dating, and this makes it the preferred mineral for dating young and potentially incompletely-bleached sediments (e.g. Bishop et al, 2005;Murari et al, 2007;Cunningham et al, 2011;Brill et al, 2012a, b;Li et al, 2017). However, previous studies of quartz OSL in tectonically active regions have shown challenging luminescence properties (e.g.…”

Standardized Dose–Response Curve (sDRC) Construction for OSL Dating of Quartz from Bohai Coast, NE China

“…It should be noted that an identical regenerative dose as the re-normalization dose should be given in the SAR protocol for the possibility of sDRC construction. OSL chronology suggests that the dated sediments in the Bohai Coast were deposited under the influence of sea-level fluctuation since the Late Pleistocene [8,9,25]. With the sDRC constructed in this study, a more detailed OSL chronology of coastal sediments in the Bohai Coast would be hopefully established in the further studies.…”

“…Meanwhile, consistency between the quartz OSL and the associated K-feldspar post-infrared (IR) infrared (pIRIR) stimulated luminescence ages have also been observed for the sediments deposited in the North Bohai Coast before the last millennium. Since the quartz OSL signal is bleached faster than the K-feldspar pIRIR signal [37][38][39], the age consistency indicates that the quartz OSL signal for the Bohai coastal sediments was generally well bleached [9,25]. The outcome of both the component analysis and age comparison implies that the OSL signal of quartz from Bohai Coast has been well bleached and is reliable for sDRC construction.…”

“…A total of 45 OSL samples collected from five sites in the region of the Bohai Coast were used in this study (Figure 1). One sampling site is a sand dune [25], while the other four are coastal cores. Sediment types include dune sand, paleosol, shallow sea, and terrestrial (fluvial and lacustrine) sediments (Figure 2).…”