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Magnetic fabric from red clay sediments in the Chinese Loess Plateau.

ABSTRACT: Well-distributed eolian red clay in a wide area of northern China is believed to imply the onset of an ancient East Asian monsoon system since Late Miocene. Two continuous red clay sequences spanning the time interval 7-2.6 Ma and 11-2.6 Ma in the Chinese Loess Plateau was investigated to determine the magnetic orientation and grain alignment in the primary fabric of eolian sediments. The north-westerly orientation of the AMS of the eolian red clay sequences parallels the material transportation direction, which differs from the model that suggests that airborne dust from overlying loess-paleosol sequences were transported by the East Asian winter monsoon and fixed by the East Asian summer monsoon. Our results further reveal that present-day climate and air circulation patterns differ from those of the pre-Quaternary, and may provide evidence of a prevailing wind during deposition of the red clay.

SUBMITTER: Gong H

PROVIDER: S-EPMC5386194 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature

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Magnetic fabric from red clay sediments in the Chinese Loess Plateau.

Gong Hujun H Zhang Rui R Yue Leping L Zhang Yunxiang Y Li Jianxing J

Scientific reports 20150427

Well-distributed eolian red clay in a wide area of northern China is believed to imply the onset of an ancient East Asian monsoon system since Late Miocene. Two continuous red clay sequences spanning the time interval 7-2.6 Ma and 11-2.6 Ma in the Chinese Loess Plateau was investigated to determine the magnetic orientation and grain alignment in the primary fabric of eolian sediments. The north-westerly orientation of the AMS of the eolian red clay sequences parallels the material transportation ...[more]

PMID: 25913292

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