柴达木盆地巨型沙波纹条带表层沉积物粒度和地球化学元素组成特征

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Characteristics of grain size and geochemical elements composition of surface sediments of megaripple stripes in the Qaidam Basin

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doi:10.12118/j.issn.1000-6060.2023.083

Abstract:

Megaripple stripes (MRS) are an enigmatic eolian bedform pattern characterized by alternating megaripples corridor (MRC) and smaller bedform corridor (SBC), oriented crosswise to the prevailing wind direction. MRCs have taller bedforms, longer wavelengths, and coarser surface sediments compared with the intervening SBCs. MRSs are widely distributed across the middle and southern margins of the Qaidam Basin, Qinghai Province of China, but their comprehensive study remains limited. Analyzing MRS surface sediments can provide a reference for the subsequent study on its formation and evolution, along with the erosion and deposition processes of eolian sand. Herein, 112 surface sediment samples were collected from the middle and southern margins of the Qaidam Basin. The physical (grain size characteristics) and chemical properties (major and trace elements) of these sediment samples were analyzed. The results of this study are as follows: (1) MRCs primarily consist of gravel and very fine sand, with gravel and very fine sand contents ranging from 44.24% to 50.19% and 15.91% to 20.42%. The grain size frequency curve of MRCs shows a bimodal distribution. Conversely, SBCs are primarily composed of very coarse and fine sands, varying from 26.00% to 35.90% and 14.80% to 20.47%. The grain size frequency curve of SBCs shows a trimodal distribution. (2) MRS sorting parameters are poor and exhibit positive and negative skewness but primarily positive skewness. MRS kurtosis is relatively wide to very wide. (3) There are no considerable differences in the content of chemical elements between MRCs and SBCs. The major elements of MRS primarily consist of SiO₂ and Al₂O₃, with the highest SiO₂ content of ~63% and Al₂O₃ content hovering at ~10%. The trace elements, such as Cr, Co, Mo, and Ba, play a dominant role compared to the upper continental crust, Cr and Mo elements show an enriched state, while other elements show signs of leaching. (4) MRS sedimentary environment in the middle and southern margin of the Qaidam Basin is cold and dry. These areas have experienced low chemical weathering, with relatively stable chemical weathering. Compositionally, they closely resemble the upper continental crust and are in the early stage of continental weathering.

Key words: megaripple stripes, Qaidam Basin, sediments, grain size, chemical elements

WANG Lijie, XIAO Fengjun, DONG Zhibao, MA Huirong, CHEN Hao. Characteristics of grain size and geochemical elements composition of surface sediments of megaripple stripes in the Qaidam Basin[J].Arid Land Geography, 2023, 46(11): 1826-1835.

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粒级	粒径/mm	沙粒级配/%
粒级	粒径/mm	MRC1	SBC1	MRC2	SBC2	MRC3	SBC3	MRC4
砾石	>2	48.51	13.13	46.95	12.59	50.19	14.12	44.24
极粗沙	1~2	11.03	28.03	13.01	26.00	10.45	35.90	7.44
粗沙	0.5~1	1.02	9.20	1.19	8.22	1.26	12.41	0.83
中沙	0.25~0.5	2.22	4.51	2.19	5.33	2.23	3.76	1.89
细沙	0.125~0.25	12.00	20.05	11.97	20.47	11.62	14.80	14.16
极细沙	0.0625~0.125	16.57	19.65	16.04	19.70	15.91	14.21	20.42
粉沙黏土	<0.0625	8.65	5.43	8.65	7.68	8.33	4.80	11.02

元素	MRS	变化范围	平均值	标准差	变异系数	背景值^[35]
SiO₂	MRC	61.22~64.09	62.56	1.09	0.02	66.00
SiO₂	SBC	62.43~65.83	64.32	1.06	0.02	66.00
Al₂O₃	MRC	9.09~10.39	9.82	0.48	0.05	15.20
Al₂O₃	SBC	9.59~10.03	9.81	0.14	0.01	15.20
Na₂O	MRC	2.99~3.76	3.39	0.33	0.10	3.90
Na₂O	SBC	3.44~3.86	3.60	0.14	0.04	3.90
CaO	MRC	3.17~4.63	3.96	0.56	0.14	4.20
CaO	SBC	3.19~4.85	4.05	0.54	0.13	4.20
Fe₂O₃	MRC	1.70~2.24	1.97	0.19	0.10	5.00
Fe₂O₃	SBC	1.82~2.04	1.92	0.10	0.05	5.00
K₂O	MRC	1.70~1.79	1.76	0.03	0.02	3.40
K₂O	SBC	1.56~1.74	1.68	0.06	0.03	3.40
MgO	MRC	0.61~1.12	0.87	0.20	0.23	2.22
MgO	SBC	0.54~0.98	0.77	0.14	0.18	2.22
TiO₂	MRC	0.12~0.17	0.14	0.02	0.15	0.50
TiO₂	SBC	0.10~0.12	0.11	0.01	0.08	0.50
MnO	MRC	0.02~0.03	0.03	0.00	0.11	0.06
MnO	SBC	0.02~0.03	0.03	0.00	0.13	0.06
P₂O₅	MRC	-	0.02	0.00	0.12	0.55
P₂O₅	SBC	-	0.02	0.00	0.06

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