GRAIN-SIZE FEATURES OF QUATERNARY RED EARTH IN JINHUA-QUZHOU BASIN

ZHU Li-dong; YE Wei; ZHOU Shang-zhe; LI Feng-quan; YANG Li-hui; SHEN Ye-qin

Marine Geology & Quaternary Geology > 2006 > 26(4): 111-116.

ZHU Li-dong, YE Wei, ZHOU Shang-zhe, LI Feng-quan, YANG Li-hui, SHEN Ye-qin. GRAIN-SIZE FEATURES OF QUATERNARY RED EARTH IN JINHUA-QUZHOU BASIN[J]. Marine Geology & Quaternary Geology, 2006, 26(4): 111-116.

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GRAIN-SIZE FEATURES OF QUATERNARY RED EARTH IN JINHUA-QUZHOU BASIN

1 College of Resource and Environment, Lanzhou University, Lanzhou 730000, China;
2 Zhejiang Normal University, Jinhua 321004, China;
3 Geography Department, Huanan Normal University, Guangzhou 510631, China

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Received Date: October 26, 2005
Revised Date: December 08, 2005

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Abstract

Abstract

Jinhua-Quzhou basin is one of the red earth regions in Zhejiang Province, which is an ideal area to study red earth sediments and global change. Grain size distribution in Tangxi section was measured, and the results are as follows:①It contains no gravel (>2 mm); low content of sand (>63 μm); and high content of both clay (<4 μm) and silt fraction (4~63 μm), which probably indicates aeolian characteristics from their parent materials and the pedogenic processes. The average contents of silt fraction, clay and sand are respectively 48.51%, 49.91% and less than 1.58%. The grain-size frequency curves of the red earth show the double-peak mode in the section-the 10~63 μm particle group and the one less than 4 μm are its "two dominating modes". ②The sedimentary environment for typical red clay unit and that for vermiculated red clay unit are similar. However, the probability accumulation curves of red earth suggest that sorting of the vermiculated red clay unit would be more complicated. ③The vertical changes of grain size in Tangxi section probably reflect the trend of dry-cold paleoclimate and the climatic variability since mid-Pleistocene in South China.
- the red earth,
- grain-size distributions,
- Quaternary,
- Jinhua-Quzhou basin

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References

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GRAIN-SIZE FEATURES OF QUATERNARY RED EARTH IN JINHUA-QUZHOU BASIN