Sediment end-member characteristics and paleoenvironment since the last glacial maximum in Mangla profile of Gonghe Basin

doi:10.7522/j.issn.1000-694X.2025.00042

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (6): 83-92.DOI: 10.7522/j.issn.1000-694X.2025.00042

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Sediment end-member characteristics and paleoenvironment since the last glacial maximum in Mangla profile of Gonghe Basin

Mengjun Hu¹^,²(), Qingzhu Bai¹^,², Aokang Xu³(), Xiangyun Meng¹

^1.College of Geography and Environmental Science /, Northwest Normal University，Lanzhou 730070，China
^2.Key Laboratory of Resource Environment and Sustainable Development of Oasis, Northwest Normal University，Lanzhou 730070，China
^3.Department of Geology，Northwest University，Xi′an 710069，China

Received:2025-02-28 Revised:2025-04-10 Online:2025-11-20 Published:2025-11-26
Contact: Aokang Xu

Abstract

Abstract:

The emerging aeolian sediment in Gonghe Basin can well record the evolution information of Asian monsoon and westerly circulation， which is a good carrier for studying paleoclimate environment. In this paper， the grain size data of aeolian sediment 512 cm thick in the Mangla profile of Gonghe Basin were analyzed by parametric end members. Combined with the grain size sensitivity index and chroma index， the characteristics of material sources and environmental significance of each end member and environmental evolution of Gonghe Basin since the last glacial maximum were explained， and the synergy with monsoon circulation system was further analyzed. The results indicate that： The grain size components of the sediments in the profile can be decomposed into three end members， EM1 is the distant dust material transported by the upper westerly wind of wet deposition， which indirectly reflects the regional dry and wet. EM2 is the meso-distant fine sediment transported in the form of suspension and saltation under the action of low-level wind system， and EM3 is the near-source coarse sediment transported in the form of creep or saltation， which indicates the strength of regional winter monsoon. Regional environmental evolution can be divided into three stages： Last glacial maximum （22.27-17.59 ka BP）， the climate was cold and dry， controlled by westerly circulation； Last deglaciation period （17.59-10 ka BP）， the climate was cold and moist， with cold and warm fluctuations， and there may be controlled by alternating summer monsoon and westerly circulation； Middle and late Holocene （8.49 ka BP to present）， the climate changed from warm and moist to cold and dry， and the summer monsoon and westerly circulation were complementary.

Key words: end member analysis, aeolian sediment, last glacial maximum, Gonghe Basin

CLC Number:

P515.2

Mengjun Hu, Qingzhu Bai, Aokang Xu, Xiangyun Meng. Sediment end-member characteristics and paleoenvironment since the last glacial maximum in Mangla profile of Gonghe Basin[J]. Journal of Desert Research, 2025, 45(6): 83-92.

Figures/Tables 9

References 58

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层号	深度/cm	类型	特征描述
ML1	0~14	表土层	浅褐色，结构松散，多植物根系，粉砂
ML2	16~80	风砂层	灰褐色，稍紧实，存在少量植物根系
ML3	81~110	黄土层	浅灰黄色粉砂，较紧实，有植物根系和砾石
ML4	110~150	砂质古土壤层	灰黄色，土质较上层变硬
ML5	150~172	黄土层	灰黄色，存在块状结构
ML6	172~260	砂质古土壤层	灰褐色，土质较硬，含粉砂
ML7	260~512	黄土层	灰黄色，土质较紧实，砂质

层号	深度/cm	类型	特征描述
ML1	0~14	表土层	浅褐色，结构松散，多植物根系，粉砂
ML2	16~80	风砂层	灰褐色，稍紧实，存在少量植物根系
ML3	81~110	黄土层	浅灰黄色粉砂，较紧实，有植物根系和砾石
ML4	110~150	砂质古土壤层	灰黄色，土质较上层变硬
ML5	150~172	黄土层	灰黄色，存在块状结构
ML6	172~260	砂质古土壤层	灰褐色，土质较硬，含粉砂
ML7	260~512	黄土层	灰黄色，土质较紧实，砂质

实验编号	样品深度 /cm	δ¹³C		PMC		年龄
实验编号	样品深度 /cm	δ¹³C/‰	1σ/‰	PMC/%	1σ/%	¹⁴C年龄/ka BP	1σ/a
XA12716	16~20	-23.99	0.15	72.51	0.24	2.58	27
XA12717	76~80	-23.35	1.00	34.76	0.17	8.49	40
XA12718	94~98	-27.78	0.09	18.53	0.12	13.54	52
XA12721	200~204	-26.92	0.14	16.09	0.12	14.68	61
XA12722	256~260	-25.09	0.11	11.19	0.10	17.59	73
XA12719	482~486	-26.87	0.10	9.85	0.10	18.62	83
XA12720	508~512	-26.24	0.11	6.25	0.07	22.27	87

实验编号	样品深度 /cm	δ¹³C		PMC		年龄
实验编号	样品深度 /cm	δ¹³C/‰	1σ/‰	PMC/%	1σ/%	¹⁴C年龄/ka BP	1σ/a
XA12716	16~20	-23.99	0.15	72.51	0.24	2.58	27
XA12717	76~80	-23.35	1.00	34.76	0.17	8.49	40
XA12718	94~98	-27.78	0.09	18.53	0.12	13.54	52
XA12721	200~204	-26.92	0.14	16.09	0.12	14.68	61
XA12722	256~260	-25.09	0.11	11.19	0.10	17.59	73
XA12719	482~486	-26.87	0.10	9.85	0.10	18.62	83
XA12720	508~512	-26.24	0.11	6.25	0.07	22.27	87

Sediment end-member characteristics and paleoenvironment since the last glacial maximum in Mangla profile of Gonghe Basin

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