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Provenance Identification for Sedimentary Sequence of Red Clay in Loess Plateau Based on Zircon U-Pb Ages(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2018年第01期
Page:
101-110
Research Field:
水资源与环境
Publishing date:

Info

Title:
Provenance Identification for Sedimentary Sequence of Red Clay in Loess Plateau Based on Zircon U-Pb Ages
Author(s):
XIE Wen-bin GONG Hu-jun
Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China
Keywords:
red clay sedimentary sequence provenance identification zircon U-Pb age paleoclimate Loess Plateau
PACS:
P66
DOI:
-
Abstract:
The widely deposited Neogene red clay sequence in Loess Plateau has important directive significance on East Asian paleoclimate. The comparison of the detrital zircon U-Pb ages of 7.0, 6.5, 5.5, 3.2 Ma from Lingtai red clay section in Gansu and 6.56, 5.24, 3.50 Ma from Baode red clay section in Shanxi was studied; the comparison of the detrital zircon U-Pb ages from red clay in Loess Plateau and the peripheral potential provenance regions was also studied. The results show that the sedimentary source of red clay in Loess Plateau has a spatial homogeneity and temporal variation. According to the difference of sedimentary sources, the red clay sediment in Loess Plateau can be divided into three stages: the first stage (5.7-7.0 Ma), the main sources are West Kunlun Mountain and Pamir Plateau; the second stage (3.4-5.7 Ma), the main source is Taklimakan desert; the third stage (2.6-3.4 Ma), the main source is Alxa area. The variation of provenance from red clay sediment shows that the west wind weakens and monsoon grows at 2.6-7.0 Ma, and the two changes of provenances correspond to Messina salinity crisis at ~5.7 Ma and the uplift of QinghaiTibet Plateau at ~3.4 Ma, respectively. In general, the important factors influencing the eolian deposition in Loess Plateau are the uplift of Qinghai-Tibet Plateau and the western mountains of China, and the Tethys ocean evolution under the control of plate motion.

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Last Update: 2018-03-08