ORIGIN OF QUATERNARY MUDDY GRAVEL DEPOSITS IN THE LUSHAN AREA

LIU Zong-xiu; ZHAO Zhi-zhong; TIAN Jiao-rong; WANG Min; LI Ming-ze

2007 Vol. 13, No. 4

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LIU Zong-xiu, ZHAO Zhi-zhong, TIAN Jiao-rong, WANG Min, LI Ming-ze. ORIGIN OF QUATERNARY MUDDY GRAVEL DEPOSITS IN THE LUSHAN AREA[J]. Journal of Geomechanics, 2007, 13(4): 322-332, 314.

Citation:

LIU Zong-xiu, ZHAO Zhi-zhong, TIAN Jiao-rong, WANG Min, LI Ming-ze. ORIGIN OF QUATERNARY MUDDY GRAVEL DEPOSITS IN THE LUSHAN AREA[J]. Journal of Geomechanics, 2007, 13(4): 322-332, 314.

ORIGIN OF QUATERNARY MUDDY GRAVEL DEPOSITS IN THE LUSHAN AREA

1.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China
2.
Chinese Research Center of National Geopark, Beijing 100081, China
3.
Lushan Administrative Bureau, Jiujiang 332900, Jiangxi, China

Received Date: 30 July 2007

Publish Date: 25 December 2007

Abstract

Abstract

The gravel fabric characteristics of Quaternary muddy gravel deposits in the Lushan area indicate the following:the lithology of gravels is almost consistent with that of bedrocks in the mountains; the isometric sphere diameter of gravels is small, the weighted average diameter of gravels is lower than the median diameter of gravel; the gravels are poorly sorted with a sorting coefficient of >1;the values are relatively lower, averaging -0.66;the F values are higher, being 22.75%-37.75%;the ratios of F/φ range from 2.75 to 4.75;the φ values are lower and concentrated, ranging from 22.75 to 37.75%, and the gravels are mainly angular and subangular.Both the a-axis and ab-plane dip towards the downstream, the dip angles of the a-axis are low and concentrated, being 7-8°, the ab-plane dips at 7～21°, and the a-axis has more preferred dip of fabrics than the ab-plane; the peak of the grain-size frequency distribution curve of deposits in the Lushan area is in the range of 4 and 5φ; The quartz sand grains are subangular and have well-developed conchoidal fractures, parallel striations, upturned cleavage flakes, "V"-shaped holes and siliceous deposits.The above-mentioned sedimentary characteristics indicate that the Quaternary muddy gravel deposits in the Lushan area should be till and glaciofluvial deposits rather than fluvial deposits or mudflows.
- Lushan Mountain /
- muddy gravel /
- fabric characteristics /
- till

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References

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