Sedimentary Interpretation of Surface Textures of Quartz Grains from the Eolian Deposits

Based on the analysis of the surface textures of Quartz grains from surface soil, last interglacial paleosol (S1), upper silt layer (L9), upper and middle red clay (RC1 and RC2) samples by Scanning Electronic Microscope, this paper show us that there exist much more silica precipitation and clearly solution evidences on the surface of the primary quartz in Lingtai surface soil, last interglacial paleosol and upper red clay samples, which reveal that eolian deposit has been modified to some degree by pedogenesis procedure after deposition because of suitable climate conditions. However, the quartz surface in the upper silt layer and middle red clay layer is very clean, and shows clearly subangular to subrounded shape and collision pits which are typical eolian evidence. All the quartz pretreated by hydrogen peroxide and hydrochloric acid are characterized by clearly subangular to subrounded shape and abundant collision pits or pocks, which prove that the red clay has the similar sedimentary origin as the overlapped loesspaleosol sequences; but the solution and precipitation evidences on the primary quartz surface may indicate the climate condition during the late Tertiary is different from the Quaternary periods' warmer-wetter and colder-dryer climatic condition.

Received Date: 1999-09-02

Rev Recd Date: 2000-01-21

Publish Date: 2000-08-10

Key words:

eolian deposits /
quartz grains /
surface textures sedimentary interpretation /

Abstract: Based on the analysis of the surface textures of Quartz grains from surface soil, last interglacial paleosol (S1), upper silt layer (L9), upper and middle red clay (RC1 and RC2) samples by Scanning Electronic Microscope, this paper show us that there exist much more silica precipitation and clearly solution evidences on the surface of the primary quartz in Lingtai surface soil, last interglacial paleosol and upper red clay samples, which reveal that eolian deposit has been modified to some degree by pedogenesis procedure after deposition because of suitable climate conditions. However, the quartz surface in the upper silt layer and middle red clay layer is very clean, and shows clearly subangular to subrounded shape and collision pits which are typical eolian evidence. All the quartz pretreated by hydrogen peroxide and hydrochloric acid are characterized by clearly subangular to subrounded shape and abundant collision pits or pocks, which prove that the red clay has the similar sedimentary origin as the overlapped loesspaleosol sequences; but the solution and precipitation evidences on the primary quartz surface may indicate the climate condition during the late Tertiary is different from the Quaternary periods' warmer-wetter and colder-dryer climatic condition.

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Reference (10)

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Sedimentary Interpretation of Surface Textures of Quartz Grains from the Eolian Deposits

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