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SEM Analysis of Quartz Sand Grain Surface Textures Indicates Alluvial/Colluvial Origin of the Quaternary “Glacial” Boulder Clays at Huangshan (Yellow Mountain), East-Central China

Published online by Cambridge University Press:  20 January 2017

P. E. Helland ,
Pei-Hua Huang  and
R. F. Diffendal Jr.
P. E. Helland
Affiliation:
Department of Geology, University of Nebraska—Lincoln, Lincoln, Nebraska, 68588-0340
Pei-Hua Huang
Affiliation:
Department of Earth and Space Sciences, University of Science and Technology of China, Academica Sinica, Hefei, 230026, China
R. F. Diffendal Jr.
Affiliation:
Conservation and Survey Division, University of Nebraska—Lincoln, Lincoln, Nebraska, 68588-0517
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Abstract

Geomorphic features and Pleistocene deposits on Huangshan have been attributed to glaciation. Recent reassessment questions this interpretation. As part of the reassessment, quartz sand grains from deposits identified as glacial boulder clays (till composed of boulders in a clay or silt matrix) were analyzed by scanning electron microscope for evidence of their sedimentary history. Surface textures found on the boulder-clay grains were compared with those on grains with known sedimentary histories including glacial, grus, colluvial, and alluvial grains. The analysis shows that the grains lack typical glacial textures. The surface textures present indicate a complex history. Nonuniformly weathered grain surfaces point to chemical weathering of the source rock. This is supported by the deep weathering of the nonquartz clasts in the sand-sized fraction as well as in boulders at the outcrops. The close correspondence in surface-texture frequencies with those of the alluvial grains indicates an alluvial component to the grains’ history. The similarity with the colluvial grains and the outcrops’ structures suggest an alluvial/colluvial origin for the deposits. The history indicated by the surface textures agrees with the recent reassessment of the geomorphic features and points to warm climatic conditions in east-central China for at least part of the Pleistocene.

Type
Research Article
Information
Quaternary Research , Volume 48 , Issue 2 , September 1997 , pp. 177 - 186
Copyright
University of Washington

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