Sediment record of environmental change at Lake Lop Nur (Xinjiang, NW China) from 13.0 to 5.6 cal ka BP -- Journal of Oceanology and Limnology,2017,35(5):1070-1078

	Cite this paper:
	WANG Jingzhong, JIA Hongjuan. Sediment record of environmental change at Lake Lop Nur (Xinjiang, NW China) from 13.0 to 5.6 cal ka BP[J]. Journal of Oceanology and Limnology, 2017, 35(5): 1070-1078

Sediment record of environmental change at Lake Lop Nur (Xinjiang, NW China) from 13.0 to 5.6 cal ka BP

WANG Jingzhong, JIA Hongjuan

Experiment & Practice Teaching Center, Heibei GEO University, Shijiazhuang 050031, China

Abstract:

Lake Lop Nur is located in the eastern part of the Tarim Basin in Xinjiang, northwestern China. A 220-cm-long sediment core was collected from the center of the ear-shaped depression forming the basin and dated with AMS¹⁴C. Grain size, total organic matter (TOC), total nitrogen (TN), and TOC/TN (C/N) analyses were used to reconstruct climatic conditions from 13.0 to 5.6 cal ka BP. The results showed five main climatic stages. Zone I (13.0-11.3 cal ka BP) was a wet-dry environment, whereas Zone Ⅱ (11.3-8.9 cal ka BP) consisted of a primarily wet environment. Zone Ⅲ (8.9-7.7 cal ka BP) was subdivided into Zone Ⅲa (8.9-8.2 cal ka BP) that indicated lake constriction and dry climate, and Zone Ⅲb (8.2-7.7 cal ka BP) in which the proxies indicated wet conditions. In Zone IV (7.7-6.6 cal ka BP), the climate presented a bit wet conditions. In Zone V (6.6-5.6 cal ka BP), abundant glauberite is present in the sediment and silt dominates the lithology; these results indicate the lake shrank and the overall climate was dry. Abrupt environmental events were also identified, including six dry events at 11.0, 10.5, 9.3, 8.6, 8.2, and 7.6 cal ka BP and one flood event from 7.8 to 7.7 cal ka BP in the Early-Middle Holocene.

Key words: Taiwan Warm Current Water (TWCW)|Taiwan Strait Warm Current (TSWC)|Kuroshio|East China Sea

Received: 2016-03-17 Revised: 2016-05-03

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