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ID 28521
file
title alternative
Formation process of the Block fields at Kui and Yano
creator
Kasai, Kosuke
NDC
Earth sciences. Geology
abstract
Block field is an accumulation of subrounded to subangular blocks without fine sizes over solid or weathered bedrock. The block field at Kui and Yano in the Hiroshima Prefecture has been designated as a natural monument by the Government. The formation process of it is described from a standpoint of weathering in this paper. The blocks at Kui and Yano are composed of granodiorite and are rounded with diameter of 1 meter to several meters. The block fi eld occurs at the mountain slope surrounded by the low-relief surface called the Sera surface. Weathering profi le developed in this area including the Sera surface is divided into 4 zones with depth: (I) grus; (II) small corestone in grus matrix; (III) large corestone with some intervening grus; (IV) fresh or slightly weathered granite with joints. Depth of I and II-zones is more than 30 meters. The blocks at Kui and Yano are inferred to be originally associated with corestones of the III-zone: the friable grus of the III-zone was readily washed away, whereas corestones were left in situ after exposing of the III-zone. Therefore, the formation of block fi eld was related to weathering process and formation of residual hill surrounded by the low-relief surface.
journal title
Bulletin of the Graduate School of Integrated Arts and Sciences, Hiroshima University. II, Studies in environmental sciences
volume
Volume 3
start page
77
end page
89
date of issued
2008-12-31
publisher
広島大学大学院総合科学研究科
issn
1881-7696
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2008 Graduate School of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
department
Graduate School of Integrated Arts and Sciences
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