青海喇家遗址土壤序列及史前山洪泥流灾难释光测年研究

炊郁达,黄春长,庞奖励,周亚利,张玉柱,郭永强,王海燕,赵琪琪

OSL dating of the pedo-stratigraphic sequence and the prehistoric flash floods and mudflows over the Lajia Ruins of Qinghai Province

CUAN Yuda,HUANG Chunchang,PANG Jiangli,ZHOU Yali,ZHANG Yuzhu,GUO Yongqiang,WANG Haiyan,ZHAO Qiqi

表2 官亭盆地上喇家剖面(SLJ)样品OSL测年结果

Tab. 2 OSL dating result of samples from the Shanglajia profile (SLJ) in the Guanting Basin

样品编号 深度(cm) 含水量(%) U(ppm) Th(ppm) K(%) 年剂量(Gy/ka) 等效剂量(Gy) 年龄(ka) SLJ-1 55-60 20±2 2.50±0.10 9.93±0.30 1.92±0.06 2.71±0.07 3.64±0.08 1.35±0.05 SLJ-2 105-110 18±2 2.79±0.11 11.5±0.32 2.11±0.06 2.98±0.08 7.61±0.35 2.55±0.14 SLJ-3 180-185 15±2 2.42±0.10 9.94±0.30 2.05±0.06 3.07±0.15 11.20±0.32 3.65±0.15 SLJ-4 240-245 15±2 2.48±0.10 11.6±0.32 2.36±0.07 3.67±0.12 13.95±0.51 3.80±0.16 SLJ-5 290-295 13±2 2.62±0.10 11.9±0.32 2.16±0.06 3.35±0.19 12.99±0.53 3.88±0.19 SLJ-6 355-360 15±2 3.45±0.13 12.6±0.35 2.35±0.07 3.56±0.14 14.08±0.68 3.96±0.24 SLJ-7 390-395 18±2 2.77±0.11 11.1±0.31 1.98±0.06 3.09±0.10 26.82±1.22 8.70±0.47 SLJ-8 430-435 18±2 3.05±0.12 11.2±0.31 1.89±0.06 2.92±0.08 34.94±0.83 12.00±0.43