基于CMB模型的巴丹吉林沙漠沙源区分析

doi:10.12118/j.issn.1000–6060.2021.02.10

Abstract

Abstract:

Desert ecosystems play an important role in global and regional environments due to their high albedo, low specific heat capacity, and high dust output. As the second largest mobile desert in China, the source of sediment in the Badain Jaran Desert has always been a subject of interest in earth science research. In this paper, the composition of surface sediments collected from the Badain Jaran Desert and surrounding areas were analyzed to identify their provenance, and the chemical mass balance model was used to estimate the contribution rates of source or sources. The results show that the main minerals in the surface sediments of the Badain Jaran Desert include relatively stable albite, albite, anorthite, anorthoclase, biotite, clinoenstatite, enstatite, microcline, muscovite, orthoclase, quartz, titanite, and non-regionally representative clinochlore, gypsum, hornblende, calcite, and halite, and the main provenances include desert lacustrine plain sands, alluvial plain sands, modern lake sediments, exogenous sands, and weathered rock crusts. The weathered rock crusts and modern lake sediments belong to in situ sanding and thus only affects the surrounding area. Alluvial sand from north of the desert and exogenous sand from the northwest are the main sources of the Badain Jaran Desert sands. These are very different from the desert sediments in the eastern parts of China which are attributed to lake sedimentation and may be related to the evolution of the desert, the scale of retreat of lakes in the region throughout geological history, and the climate and environmental conditions.

Key words: minerals, aeolian sand, CMB model, provenance analysis, Badain Jaran Desert

NING Kai,WANG Naiang,LI Zhuolun,YANG Zhenjing,BI Zhiwei,WANG Yixin,WANG Pan,SUN Jie. Analysis of sand source for Badain Jaran Desert based on CMB model[J].Arid Land Geography, 2021, 44(2): 389-399.

Figures/Tables 8

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矿物种类	石英	白云母	钙长石	微斜长石	顽辉石	钠长石	歪长石	正长石	斜绿泥石
平均值/%	29.23	18.22	11.21	9.49	8.34	8.25	3.28	2.76	1.99
标准差	13.39	14.83	5.07	7.86	8.30	6.14	4.35	5.92	3.92
变异系数	0.46	0.81	0.45	0.83	1.00	0.74	1.32	2.14	1.98
矿物种类	榍石	斜顽辉石	铁辉石	方解石	角闪石	石膏	普通角闪石	岩盐	总
平均值/%	1.93	1.82	1.56	0.98	0.41	0.31	0.10	0.07	5.88
标准差	2.18	3.11	3.12	4.22	1.66	1.95	0.49	0.53	9.98
变异系数	1.13	1.71	2.00	4.31	4.04	6.34	4.81	7.79	1.70

源类	矿物种类
源类	钠长石	钙长石	歪长石	斜顽辉石	透辉石	顽辉石	铁辉石	微斜长石	白云母	正长石	石英	榍石
岩石风化壳	13.00	22.00	11.50	0.00	2.00	2.00	4.00	7.00	12.00	2.00	21.50	0.00
湖积平原	6.91	7.91	6.45	3.73	2.45	7.36	7.27	10.00	16.73	2.91	19.82	2.09
湖泊沉积	8.18	11.59	7.18	2.53	0.82	20.71	1.76	9.00	5.65	2.12	24.94	2.94
洪积平原	6.00	11.93	6.73	3.40	3.33	6.53	4.07	5.07	5.53	2.53	35.67	4.40
外源沙	5.57	7.78	4.61	2.83	1.65	5.35	3.43	6.17	27.43	3.13	25.96	2.26

Analysis of sand source for Badain Jaran Desert based on CMB model

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矿物名称		石英	长石	白云母	辉石	黑云母	榍石	斜绿泥石	角闪石	方解石
BY61	BY61粗沙	36	34	4	17	0	3	0	0	0
	BY61中沙	44	19	5	11	12	3	3	0	0
	BY61细沙	18	29	21	21	0	0	2	4	1
	BY61全样	26	27	20	18	2	3	0	0	0
BY98	BY98粗沙	50	10	5	22	6	4	0	0	0
	BY98细沙	26	20	2	31	9	4	0	0	1
	BY98极细沙	19	24	20	23	0	4	2	3	0
	BY98全样	25	33	3	24	0	5	1	0	0
BY100	BY100中沙	54	26	6	5	3	4	0	0	0
	BY100细沙	30	14	32	8	8	3	2	0	0
	BY100极细沙	30	23	23	9	0	0	3	4	2
	BY100全样	20	31	18	18	3	3	1	0	0

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