River Metamorphosis During Damuda Sedimentation: A Case Study from Talchir Gondwana Basin,

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River Metamorphosis During Damuda Sedimentation: A Case
Study from Talchir Gondwana Basin,

Orissa.

R
ABINDRA
N
ATH
H
OTA
, W
ATARU
M
AEJIMA
and B
ANABEHARI
M
ISHRA



Abstract:

The Karharbari, Barakar and Barren Measures formations of the Damuda Group of
Tal
chir Gondwana Basin show noticeable differences in their lithic fill. The Karharbari
Formation represents syntectonic phase of sedimentation where as, the Barakar and Barren
Measures Formations represent post
-
tectonic stable phases. The stream parameters o
f these three
formations were determined objectively employing empirical equations worked out from modern
streams. Stream parameters like depth, width, meander wavelength, annual discharge, normal and
clast flow velocities decrease from Karharbari to Barak
ar sedimentation and increase from
Barakar to Barren Measures sedimentation. Sediment load parameter, channel slope, flood stage
velocity and Froude number, on the other hand, record alternatively increasing and decreasing
trend while channel sinuosity sho
w a steady increasing trend with advancement of Damuda
sedimentation. Results suggest that during Damuda sedimentation the streams underwent
metamorphosis, which may be attributed to tectonism in the source area and gradual denudation
of the depositional s
urface coupled with possible changes in climatic condition.




Keywords
: River metamorphosis, Sedimentation, Palaeocurrent, Palaeoflow, Gondwana, Talchir
basin, Damuda Group, Orissa.








Journ
al of the Geological Society of India

Vol:

69
,

No: 6
,

June 2007, pp: 1351
-
1360