Characteristics, age and process of Mohetai alluvial fan gobi in the upper reaches of Baiyang River in the western margin of Junggar Basin, NW China

doi:10.7522/j.issn.1000-694X.2020.00030

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (4): 1-9.DOI: 10.7522/j.issn.1000-694X.2020.00030

Characteristics, age and process of Mohetai alluvial fan gobi in the upper reaches of Baiyang River in the western margin of Junggar Basin, NW China

Suchao Li¹^,²(), Man Qiu³, Xiaoze Li¹^,²(), Jingde Liu⁴, Limin Wang⁵, Yang Hu⁴, Zhigang Li¹, Gaihong Niu¹^,²

^1.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
^2.University of Chinese Academy of Sciences, Beijing 100049, China
^3.Xinjiang Production and Construction Corps Geological Exploration Center, Urumqi 830000, China
^4.Xinjiang Academy of Agricultural Reclamation, Shihezi 832000, Xinjiang, China
^5.Xinjiang Surveying & Designing Institute, Ministry of Agriculture / Xinjiang Production and Construction Corps Surveying & Designing Institute (Group) Co. , Ltd, Urumqi 830000, China

Received:2020-01-14 Revised:2020-03-09 Online:2020-08-20 Published:2020-09-01
Contact: Xiaoze Li

Abstract

Abstract:

Gobi geomorphology and sedimentary of the alluvial fan had developed in the Mohetai area, which is located in the upper reaches of Baiyang River in the western margin of Junggar Basin, NW China. There are abundant strontium-rich water and soil resources. It is of great significance to study the paleoenvironment and water and soil resources. Based on previous studies, our field investigation and laboratory analysis, the fan groups were classified into three types by morphological parameter characteristics: large, medium and small. The basement of the fan is mainly composed of dipping strata from Jurassic to the early Neogene. The fan body strata chiefly consist of the upper part of Neogene and the Quaternary gravel layer. The sedimentary facies of the fan body strata include aeolian sub-facies (ventifacts, sand dunes and loess etc.), aquatic sub-facies (fluvial, lacustrine facies etc.), gravity collapse sub-facies and suspected moraine sub-facies. The fan bodies had been primarily formed since 3.596 Ma BP. The process of geomorphology, sedimentation and environment were divided into three stages and seven sub-stages, corresponding to the regional tectonic-climate stages, respectively.

Key words: Junggar Basin, alluvial fan, gobi geomorphology, formation age, development process

CLC Number:

P531

Suchao Li, Man Qiu, Xiaoze Li, Jingde Liu, Limin Wang, Yang Hu, Zhigang Li, Gaihong Niu. Characteristics, age and process of Mohetai alluvial fan gobi in the upper reaches of Baiyang River in the western margin of Junggar Basin, NW China[J]. Journal of Desert Research, 2020, 40(4): 1-9.

Figures/Tables 8

References 45

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冲积洪积扇名称	编号	扇体规模	冲积洪积扇地貌形态参数
冲积洪积扇名称	编号	扇体规模	面积/km²	平均坡度/（°）	比降	高差/m	长/km	宽/km	宽长比	扇顶角/（°）
白杨河扇		大	715.66	4.09	0.029	422	32.78	45.82	1.40	125
布尔阔台河扇		中	253.97	4.45	0.055	644	17.02	19.90	1.17	136
蒙戈尔姜扇群	1	小	19.25	6.96	0.184	319	5.89	3.95	0.67	123
	2		8.21	6.90	0.208	310	4.70	2.21	0.47	80
	3		9.01	6.71	0.216	283	4.63	2.57	0.56	80
	4		7.21	8.51	0.233	279	3.91	2.23	0.57	70
	5		18.29	6.04	0.204	478	5.40	4.30	0.79	103
	6		8.04	4.86	0.182	343	5.53	3.00	0.54	110

冲积洪积扇名称	编号	扇体规模	冲积洪积扇地貌形态参数
冲积洪积扇名称	编号	扇体规模	面积/km²	平均坡度/（°）	比降	高差/m	长/km	宽/km	宽长比	扇顶角/（°）
白杨河扇		大	715.66	4.09	0.029	422	32.78	45.82	1.40	125
布尔阔台河扇		中	253.97	4.45	0.055	644	17.02	19.90	1.17	136
蒙戈尔姜扇群	1	小	19.25	6.96	0.184	319	5.89	3.95	0.67	123
	2		8.21	6.90	0.208	310	4.70	2.21	0.47	80
	3		9.01	6.71	0.216	283	4.63	2.57	0.56	80
	4		7.21	8.51	0.233	279	3.91	2.23	0.57	70
	5		18.29	6.04	0.204	478	5.40	4.30	0.79	103
	6		8.04	4.86	0.182	343	5.53	3.00	0.54	110

	面积	平均坡度	比降	高差	长	宽	宽长比
平均坡度	-0.647
比降	-0.894^**	0.831^*
高差	0.408	-0.672	-0.699
长	0.995^**	-0.723^*	-0.933^**	0.480
宽	0.998^**	-0.699	-0.915^**	0.457	0.999^**
宽长比	0.914^**	-0.727^*	-0.943^**	0.709^*	0.938^**	0.935^**
扇顶角	0.548	-0.786^*	-0.797^*	0.714^*	0.615	0.587	0.726^*

	面积	平均坡度	比降	高差	长	宽	宽长比
平均坡度	-0.647
比降	-0.894^**	0.831^*
高差	0.408	-0.672	-0.699
长	0.995^**	-0.723^*	-0.933^**	0.480
宽	0.998^**	-0.699	-0.915^**	0.457	0.999^**
宽长比	0.914^**	-0.727^*	-0.943^**	0.709^*	0.938^**	0.935^**
扇顶角	0.548	-0.786^*	-0.797^*	0.714^*	0.615	0.587	0.726^*

阶段	亚阶段	时段/Ma BP	沉积速率/(m·ka^-1)	速率状态	岩相	源区冷/暖	沉积区干/湿
Ⅲ	7	<1.072	0.139	快	灰色砾岩	冷	冷干
Ⅱ	6	2.581~1.072	0.022	慢	灰黄色泥砂质砾岩	较冷	冷干
	5	3.032~2.581	0.090	较慢	灰黄色泥砂质砾岩	冷	冷干
	4	3.330~3.032	0.016	最慢	灰黄色泥砂质砾岩	弱冷	温干
	3	3.596~3.330	0.242	最快	灰黄色泥砂质砾岩	最冷	冷干
Ⅰ	2	6.033~3.596	0.020	慢	红色泥质岩	弱冷	温干
Ⅰ	1	6.733~6.033	0.085	较慢	浅红色含砾泥质砂岩	较暖	暖干

Characteristics, age and process of Mohetai alluvial fan gobi in the upper reaches of Baiyang River in the western margin of Junggar Basin, NW China

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