毛烏素沙地東南緣沉積物光釋光測年與環(huán)境變遷研究
[Abstract]:Mu Us Sand is located in the northwest edge of the East Asian monsoon. It has a large number of human activities and is an ideal area for the study of climate change, environmental evolution and human-land relationship. Quartz minerals were mostly used as dating materials, feldspar minerals were seldom used. The authors found that most quartz signals from Holocene samples in this area were very weak, which resulted in relatively large dating errors and could not meet the dating requirements. In order to solve this problem, the K-feldspar minerals in the samples were extracted, and the two-step infrared (pIRIRIR150) dating process excited at 150 C after 50 C excitation was used. At the same time, three lacustrine sedimentary samples with strong quartz signal were selected, and the quartz ages were measured by the single regeneration dose (SAR) process. The equivalent dose (De) of potassium feldspar samples was measured by standard growth curve (SGC) and potassium feldspar pIRIR 150. For three quartz samples, the dose recovery ratio of each sample was 0.9-1.1. The average value was 0.98 (+ 0.025) (n = 16). The photoluminescence characteristics showed that the quartz signals of the three samples were strong; the cycle ratios were mostly between 0.9 and 1.1, with an average value of 1.01 (+ 0.008) (n = 78); the heat transfer effect was less than 5%; the infrared detection showed that the quartz particles had no feldspar pollution. D. distribution was concentrated and the dispersion was less than 20%. Dose recovery experiments for potassium feldspar minerals show that the recovery ratios of pIRIR1so signal in each sample are between 0.9 and 1.1, with an average of 1.0 (+ 0.003) (n = 9). The luminescence characteristics are not obvious, the pIRIR150 signal is much stronger than the quartz signal; the cycle ratio and the heat transfer effect are all satisfied. Residual dose experiments show that the residual agents of pIRIR150 signal in three samples are satisfied. The anomalous attenuation experiment shows that the g-value distribution of pIRIR150 signal in three samples is 0.55-1.71%/decade, much smaller than that of IRSL50 signal. D. distribution is concentrated, and the dispersion is smaller than that of quartz. Two samples are selected. The ratio of SGC De to pIRIR150 De ranges from 0.92 to 1.06, with an average value of].00.01 for the samples with De less than 1 Gy. The main conclusions are as follows: (1) The three quartz ages can be used as the basis for chronological comparison. (2) The same three samples of K-feldspar have suitable experimental conditions without correction of abnormal attenuation rate, and the K-feldspar pIRIRIR150 is consistent with the quartz age, and the chronological results are reliable. Feldspar pIRIR150 technique was used to dating the samples in this area. (3) The SGC constructed in this paper can accurately calculate the De values of the samples between 1 and 70 Gy, but is not suitable for the calculation of the De values of the young samples less than 1 Gy. (4) Dune activation from the last glacial maximum to the last glacial depression (22-11.8 ka) was caused by dry and cold climate; from the early Holocene to the early late Holocene (11.8-2. 4 ka) paleo-lakes developed, and the early Holocene tended to warm, and the mid-Holocene was the warmest and wettest relatively; the late Holocene to the present (2.4-0 ka) sand dunes were basically activated, and there was a fixed trend around 1.5 ka. Human activities were the main factors of sand dunes activation in this period. (5) Sarawusu River Sancha reach 2.4 Ka or shallow lake, wide and shallow meandering state; The formation of the river has a great influence on the geomorphological pattern and sand dune activation in the study area. This paper verifies the reliability of the K-feldspar pIRIR150 luminescence dating technique applied to sediment chronology in Mu Us sandy land and the accuracy of calculating D. Support.
【學位授予單位】:蘭州大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:P597.3;P941.73
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