Study on silt and clay provenance in the Yarlung Zangbo River middle reaches using sediment physicochemical characteristics

doi:10.7522/j.issn.1000-694X.2021.00024

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 92-100.DOI: 10.7522/j.issn.1000-694X.2021.00024

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Study on silt and clay provenance in the Yarlung Zangbo River middle reaches using sediment physicochemical characteristics

Yan Zhang¹(), Pengfei Ma², Lin Zeng², Aimin Liang³, Zhengcai Zhang¹()

^1.Key Laboratory of Desert and Desertification，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.Tibet Climate Center，Lhasa 850000，China
^3.Shaanxi Normal University，Xi’an 710119，China

Received:2021-01-14 Revised:2021-02-11 Online:2021-05-26 Published:2021-05-26
Contact: Zhengcai Zhang

Abstract

Abstract:

Sediment provenance is one of the issues for aeolian research. Yarlung Zangbo River middle reaches is the main sand distribution region， and also is the aeolian disaster region. However， there is few research had been done on the sediment provenance in the Yarlung Zangbo River， which limited our knowledge on aeolian geomorphology formation and development， aeoian disaster prevention and dust storm forecasting. Sediment physicochemical property had been widely used to identify sediment provenance. Therefore， we collected sediment on river bank， sand dunes， and floodplain samples from field investigations. Sediment grain size and selected < 63 μm sediment chemical properties were analyzed. The results indicated that：（1） Sand， silt and clay contents are different for landscapes. The silt and clay content are similar for river bank and floodplain， and sand content is the maximum in sand dunes. （2） Sediment geochemical characteristics are similarities for five landsacpes. Major elements are mainly deficit， and SiO₂ content is the largest for all samples， and MgO content is the smallest. （3） Trace elements are mainly enriched. （4） Ratios of selected elements are similar for five landscapes， which means that sediment provenance is similar for all landscapes. Therefore， river bank and floodplain has the sediment conditions for aeolian disaster， and it’s a main dust sources for aeolian disaster.

Key words: Yarlung Zangbo River, aeolian sediment, physicochemical characteristics, sediment provenance

CLC Number:

P931.3

Yan Zhang, Pengfei Ma, Lin Zeng, Aimin Liang, Zhengcai Zhang. Study on silt and clay provenance in the Yarlung Zangbo River middle reaches using sediment physicochemical characteristics[J]. Journal of Desert Research, 2021, 41(3): 92-100.

Figures/Tables 10

References 33

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参数	河岸（N=6）	河漫滩（N=12）	河漫滩沙丘（N=6）	林地（N=10）	沙丘（N=35）
黏土/%	9.1±13.5	4.4±3.9	1.0±1.0	1.2±0.7	0.4±0.5
粉沙/%	45.9±19.2	38.8±25.8	7.8±3.9	15.2±6.5	5.8±7.2
沙/%	44.9±28.4	46.8±28.4	91.3±4.8	83.6±7.1	93.7±7.6
M_z/mm	0.05±0.04	0.08±0.07	0.17±0.05	0.13±0.03	0.20±0.02
M_z/Φ	5.04±1.90	4.14±1.41	2.64±0.50	2.98±0.33	2.36±0.19
分选系数（σ）	1.71±0.36	1.73±0.47	1.06±0.38	1.22±0.23	0.74±0.20
偏度（SK）	-0.27±0.28	-0.39±0.20	-0.31±0.22	-0.28±0.13	-0.15±0.10
峰度（K_g）	1.27±0.18	1.35±0.48	1.78±0.62	1.48±0.23	1.23±0.31

参数	河岸（N=6）	河漫滩（N=12）	河漫滩沙丘（N=6）	林地（N=10）	沙丘（N=35）
黏土/%	9.1±13.5	4.4±3.9	1.0±1.0	1.2±0.7	0.4±0.5
粉沙/%	45.9±19.2	38.8±25.8	7.8±3.9	15.2±6.5	5.8±7.2
沙/%	44.9±28.4	46.8±28.4	91.3±4.8	83.6±7.1	93.7±7.6
M_z/mm	0.05±0.04	0.08±0.07	0.17±0.05	0.13±0.03	0.20±0.02
M_z/Φ	5.04±1.90	4.14±1.41	2.64±0.50	2.98±0.33	2.36±0.19
分选系数（σ）	1.71±0.36	1.73±0.47	1.06±0.38	1.22±0.23	0.74±0.20
偏度（SK）	-0.27±0.28	-0.39±0.20	-0.31±0.22	-0.28±0.13	-0.15±0.10
峰度（K_g）	1.27±0.18	1.35±0.48	1.78±0.62	1.48±0.23	1.23±0.31

元素	河岸（N=6）	河漫滩（N=12）	林地（N=10）	河漫滩沙丘（N=6）	沙丘（N=35）
SiO₂	62.74±0.55	62.19±0.97	63.39±0.54	61.50±0.77	62.7±0.20
Al₂O₃	13.10±0.87	14.29±1.52	12.78±0.47	14.08±1.87	13.0±0.50
Fe₂O₃	5.34±0.42	6.02±0.69	4.72±0.38	6.75±0.34	5.0±0.30
CaO	2.99±0.34	2.70±0.39	2.14±0.36	2.84±0.33	2.8±0.70
MgO	1.70±0.14	1.88±0.19	1.51±0.07	1.87±0.20	1.7±0.10
K₂O	2.42±0.29	2.51±0.26	2.45±0.09	2.45±0.31	2.5±0.20
Na₂O	1.83±0.15	1.77±0.18	1.85±0.08	1.70±0.10	1.8±0.10
其他	8.97±1.29	7.71±1.91	10.30±0.56	7.67±2.06	9.7±0.70

元素	河岸（N=6）	河漫滩（N=12）	林地（N=10）	河漫滩沙丘（N=6）	沙丘（N=35）
SiO₂	62.74±0.55	62.19±0.97	63.39±0.54	61.50±0.77	62.7±0.20
Al₂O₃	13.10±0.87	14.29±1.52	12.78±0.47	14.08±1.87	13.0±0.50
Fe₂O₃	5.34±0.42	6.02±0.69	4.72±0.38	6.75±0.34	5.0±0.30
CaO	2.99±0.34	2.70±0.39	2.14±0.36	2.84±0.33	2.8±0.70
MgO	1.70±0.14	1.88±0.19	1.51±0.07	1.87±0.20	1.7±0.10
K₂O	2.42±0.29	2.51±0.26	2.45±0.09	2.45±0.31	2.5±0.20
Na₂O	1.83±0.15	1.77±0.18	1.85±0.08	1.70±0.10	1.8±0.10
其他	8.97±1.29	7.71±1.91	10.30±0.56	7.67±2.06	9.7±0.70

元素	河岸（N=6）	河漫滩（N=12）	林地（N=9）	河漫滩沙丘（N=5）	沙丘（N=7）
Ti	4 545.5±557.4	4 812.2±562.4	4 320.0±418.4	5 546.5±792.4	4 226.7±312.6
Rb	116.4±17.0	120.4±15.6	118.2±4.7	120.5±14.8	121.2±11.0
Sr	204.4±21.4	196.3±13.0	191.6±5.5	196.2±6.7	202.2±19.6
Y	37.9±7.	36.7±9.3	40.1±8.6	58.4±26.4	35.0±7.0
Zr	668.6±295.8	632.3±446.7	816.9±354.5	1 706.3± 1290.3	575.6±326.7
Nb	15.8±0.6	16.5±1.6	15.4±1.4	18.3±2.3	15.0±1.4
Ba	383.3±35.4	407.9±51.5	383.0±15.6	400.8±51.1	390.2±21.0
La	44.2±10.2	42.2±11.0	46.4±7.9	58.6±24.4	38.1±7.7
Ce	85.7±17.4	84.7±25.7	93.1±16.8	117.9±54.4	75.6±16.6

Study on silt and clay provenance in the Yarlung Zangbo River middle reaches using sediment physicochemical characteristics

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