MIS 3以来雅鲁藏布江流域风成沉积及环境意义

doi:10.11821/dlxb201911014

Abstract

Abstract:

The aeolian deposits in the Yarlung Zangbo catchment are widely developed, and its sedimentary development model is complex. The climatic implication and chronological boundary of the aeolian sediments are not clear enough. Therefore, from the perspective of the whole basin, this paper comprehensively analyzed the development mechanism and mode of the aeolian sediments in different regions. At the same time, the chronological data of aeolian deposition is normalized and compared with the classical curve of global climate. The results show that: (1) The aeolian deposits in the basin have prevailing wind field development patterns and local wind field development patterns, and different patterns of aeolian sediments have different indications for the environment. (2) The aeolian sediments in the basin are mostly deposited in the Last Glacial Maximum (LGM), which mainly developed in different periods since the Late Glacial Period (15 ka BP), and the rich source of alluvial debris may be the main controlling factor of the aeolian activities. The aeolian sediments forming in the earlier time were brought into the river and failed to be preserved due to the warming climate and the erosion transport caused by glacial ablation after the LGM. (3) Since the LGM, the aeolian deposition process of Yarlung Zangbo has been controlled by the regional and global paleoclimate environment, and the fluctuations are drastic. The aeolian sedimentary process of different climate stage have different records to the 30°N summer insolation, the Indian monsoon and westerly winds change signal, but have a better response to the Younger Dryas (YD), global cold event. In short, the sedimentary process of Yarlung Zangbo is similar with that of the other regions on the Tibetan Plateau, and both recorded the global paleoclimatic change, but have its regional uniqueness. 4) The strong accumulation process of aeolian sediments in the Yarlung Zangbo catchment is not a simple correspondence with the global classical climate curve, and it presents a more complex response pattern to global climate change, which shows that the aeolian deposition process of the alpine valley environment is not only affected by the climate of the large area, but also controlled by many local environmental factors. Their relation with the paleoclimatic environment is complex.

Key words: aeolian sediments, chronology, paleoclimate and paleoenvironment, Yarlung Zangbo catchment, MIS3

LING Zhiyong, JIN Jianhui, WU Duo, LIU Xiangjun, XIA Dunsheng, CHEN Fahu. Aeolian sediments and their paleoenvironmental implication in the Yarlung Zangbo catchment (southern Tibet, China) since MIS3[J].Acta Geographica Sinica, 2019, 74(11): 2385-2400.

Figures/Tables 10

Fig. 1

Tab. 2

Chronology of aeolian sediments of the Yarlung Zangbo catchment

编号	经度E	纬度N	海拔(m)		地貌部位	深度(cm)	年龄(ka)	测年方法	沉积物类型	文献编号
1	89°33′	29°19′	3800		河流阶地	360	2.7±0.2	OSL	黄土	[5]
2	88°55′	29°19′	3920		河流阶地	380	11±1.2		黄土
3	89°51′	29°16′	3970		低山山麓	580	13±1.4		黄土
4	95°30′	30°08′	3070		低山山麓	29	25.5±4.0	TL	风成沙	[17]
5	89°49′	29°44′	4571		山麓侧碛堤	42	4.4±0.13	¹⁴C	古土壤
6	89°49′	29°44′	4571		山麓侧碛堤	70	8.8±3.9	TL	黄土状土
7	89°51′	29°46′	4835		山麓终碛堤	34	2.3±0.06	¹⁴C	古土壤
8	89°51′	29°46′	4835		山麓终碛堤	50	7.8±1.2	TL	黄土状土
9	88°54′	29°19′	3889		河流阶地	65	12.4±0.9	OSL	砂黄土	[18]
10	88°54′	29°19′	3889		河流阶地	75	12.3±1.2		砂黄土
11	90°54′	29°25′	3819		河流阶地	40	13.7±1.2		砂黄土
12						50	12.7±1.1	砂黄土
13						80	13.2±1.3	砂黄土
14						120	13.7±1.2	砂黄土
15	83°47′	29°52′	4600		河谷山麓	201	2.5±0.17	¹⁴C	砂质古土壤	[19]
16						221	3.3±0.06	¹⁴C	砂质古土壤
17						240	4.6±0.89	OSL	风成沙
18						258	7.6±0.04	¹⁴C	砂质古土壤
19						300	23.9±5.4	OSL	风成沙
20	91°06′	29°38′	3660		河谷山麓	50	2.9±0.2	OSL	风成沙	[7-8]
21						180	4.1±0.4		风成沙
22						280	6.7±0.5		风成沙
23	90°43′	29°21′	3603		河谷山麓	280	8.5±0.7		风成沙
24	90°54′	29°26′	3597		河谷山麓	130	7.7±0.8		风成沙
25						250	14.3±1.6		风成沙
26						340	18.8±2.0	风成沙
27	90°54′	29°22′	3820		河谷山麓	70	14.4±1.1	风成沙
28	90°54′	29°22′	3820		河谷山麓	300	19.8±1.9	风成沙
编号	经度E	纬度N	海拔(m)	地貌部位		深度(cm)	年龄(ka)	测年方法	沉积物类型	文献编号
29	90°54′	29°22′	3820	河谷山麓		650	23.9±2.1	OSL	风成沙	[7-8]
30	90°54′	29°22′	3820	河谷山麓		1000	21.3±1.8		风成沙
31	90°45′	29°21′	3536	河流阶地		130	17.2±1.4		风成沙
32	91°49′	29°47′	3894	河流阶地		130	28.2±3.1		风成沙
33						350	81±7		风成沙
34						600	82±8		黄土
35						800	118±11		黄土
36	91°40′	29°45′	3840	河谷山麓		160	34.1±3.0	黄土
37						320	45±4	黄土
38						400	63±7	黄土
39	91°03′	29°40′	3707	河谷山麓		330	32.3±3.2	风成沙
40						590	69±7	黄土
41						850	82±8	黄土
42	91°38′	29°48′	3778	低山山麓		600	79±8	黄土
43	91°38′	29°48′	3778	低山山麓		800	103±11	黄土
44	87°41′	28°27′	4060	河流阶地		22	0.4±0.05	OSL	风成沙	[20]
45						164	2.4±0.2		风成沙
46						248	7.5±0.28		风成沙
47	87°49′	28°32′	4063	山前坡地		26	0.58±0.38		风成沙
48						170	3.7±0.51	风成沙
49						210	6.6±0.04	¹⁴C	砂质古土壤
50						268	12.8±0.06	¹⁴C	砂质古土壤
51	88°07′	28°16′	4335	山坡洼地		8	4.9±0.13	AMS¹⁴C	砂质古土壤
52	88°07′	28°16′	4335	山坡洼地		24	5.1±0.23	AMS¹⁴C	砂质古土壤
53	89°32′	29°20′	3797	河流阶地		98	3.2±0.3	OSL	黄土	[21]
54	89°32′	29°20′	3797	河流阶地		170	7.9±0.9	OSL	黄土	[21]
55	94°22′	29°39′	3298	河谷低山台地		230	29.4±2.7	OSL	黄土	[22]
56						400	36.5±3.2		弱成古土壤
57						500	39.5±3.4		黄土
58	96°48′	29°26′	3948	河谷山麓		40	0.62±0.09	OSL	黄土	[23]
59						130	2.91±0.20		黄土—古土壤
60						160	4.86±0.36		古土壤
61						180	6.19±0.45		黄土
62						220	6.66±0.53		黄土
63	89°17′	29°23′	3856	河流阶地		65	2.23±0.1	¹⁴C	风成沙	[24]
64						165	3.58±0.13	¹⁴C	砂质古土壤
65						235	5.69±0.1	¹⁴C	砂质古土壤
66						355	8.56±0.7	TL	风成沙
67	91°43′	29°15′	3561	河流阶地		157	5.9±0.2	OSL	砂黄土	[25]
68	91°43′	29°15′	3561	河流阶地		657	8.5±0.6	OSL	风成沙	[25]
69	90°41′	29°19′	3600	河谷山麓		43	4.3±0.1	¹⁴C	冲淤沙层	[6, 25-26]
70						70	5.15±0.1		冲淤沙层
71						125	5.57±0.13		冲淤沙层
72						209	7.83±0.13		冲淤沙层

Tab. 2

Fig. 2

Fig. 3

Fig. 4

Tab. 1

Fig. 5

Fig. 6

Fig. 7

Fig. 8

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地点名称	经纬度	地貌部位	海拔(m)	运移方位	沉积物类型	气候类型
马泉河谷/A	83°31′E,29°55′N	江北岸	4585~4720	65°	风沙	干旱半干旱气候
日喀则段/B	89°22′E,29°23′N	江北岸	3795~3855	85°	黄土、风沙	半干旱气候
拉萨—桑日段/C	91°33′E,29°19′N	江北岸	3553~3855	35°	黄土、风沙	半干旱气候
卧龙镇西部/D	93°41′E,29°09′N	江南岸	2965~3115	190°	风沙	湿润半湿润
卧龙镇东部/E	93°46′E,29°08′N	江南岸	2961~3015	320°	风沙	湿润气候
丹娘乡北岸/F	94°44′E,29°28′N	江北岸	2919~3067	305°	黄土、风沙	湿润气候

Aeolian sediments and their paleoenvironmental implication in the Yarlung Zangbo catchment (southern Tibet, China) since MIS3

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