The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou

ZHANG You-long; ZHOU Ling-qi; ZHANG Wei-xiong; SHI Wen-li

2003 Vol. 36, No. 3

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Article navigation > Northwestern Geology > 2003 > 36(3): 29-35

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ZHANG You-long, ZHOU Ling-qi, ZHANG Wei-xiong, SHI Wen-li. The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou[J]. Northwestern Geology, 2003, 36(3): 29-35.

Citation:

The characteristics of rock, grain-size, sporo-pollen and depositional model in the oldest loess section in Lanzhou

1.
Lanzhou Institute of Seismology, Bureau of Seismology of China, Lanzhou 730000, China
2.
Third Institute of Geology and Mineral Exploration, Geological Survey of Gansu Province, Lanzhou 730050, China

Received Date: 27 December 2001

Revised Date: 04 January 2002

Publish Date: 15 September 2003

Abstract

Abstract

The oldest loess deposits in Lanzhou area,formed 1.84 Ma.B P ago,was recognized for the first time in the Shanchengwanling Section,Digou village,Yongdeng county,North of Lanzhou.It has eighteen integral sequences of loessp aleosol.The average grain-sizes of loess are 23.57 μm,and of paleosol is 19.10 μm.The loess is composed of siltstone and 90% grass-flower flours in sporo-pollen a ssemblage.On the basis of field survey and indoor systermatic study,the authors summarized the genesis of loess and depositional model,determined the location of up and down siltstone layers through stratigraphic correlation.
- Lanzhou /
- magneto stratigraphic strata /
- sporo-pollen assemblage /
- loess /
- stratigraphic correlation