A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Bagchi, Joyesh
- Aeolian Sediment Transport Defined by Grain Size Trends in Part of Haryana
Authors
1 Geological Survey of India, Faridabad - 121 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 658-666Abstract
Aeolian deposits occur extensively over the Ambala Older Alluvium in the southern and western part of Haryana. Delineating aeolian sediment transport pattern assists in characterising the aeolian environment and in understanding the evolution of the Thar Desert. Surface exposures of the Late Quaternary stabilised dunes do not exhibit primary structures based on which sediment transport direction can be inferred. The present study of a part of Haryana aims at trend analysis of the first three moment measures of aeolian sediment size distribution to delineate sediment transport pattern.
In the study area trend surface analysis of mean sorting and skewness shows statistically significant trends. Mean size and skewness with a linear trend decreases towards northeast. Sorting increases towards northeast, southeast and southwest. Transport vector' analysis reveals a sediment transport pattern, With northeast and south as the two dominant directions of transportation.
Keywords
Aeolian Sediment, Net Sediment Transport, Size Statistics, Transport Vector, Haryana.
- Factor Analysis of Sphericity and Roundness Statistics and Correspondence Analysis of Size Statistics of the Sediments of Gujarat Coast
Authors
1 Schlumberger - Wireline and Testing, P.O. Box. 9097, N.S.E. Estate, Western Express Highway, Goregaon (East), Mumbai - 400 063, IN
2 Department of Earth Sciences, IIT Powai, Mumbai - 400 076, IN
3 Geological Survey of India, Faridabad - 121 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 1 (2003), Pagination: 51-62Abstract
The present study aims at characterization of beach environment of a part of Gujarat Coast (the entire Saurashtra Coast and the southern portion of Kutch Coast - all facing open sea) with respect to its physical parameters. Prevailing marine forces along with the seasonal fluvial conditions play the pivotal role in bringing out this modern sedimentary environment under discussion. The textural parameters of grain size and shape are chosen for statistical analysis and interpretation.R-mode factor analysis was carried out on the four sample statistics of two-dimensional projection sphericity and those of two-dimensional projection roundness of beach sand grains ranging in size from 0.3 mm to 0.149 mm. The third factor loadings show that the grains possess bimodality. The factor score interpretations thereof clearly explain this phenomenon in terms of the mixing of sediments from fluvial and marine sources. Correspondence analysis was used to visually represent an interrelationship between individuals (i.e. samples) and attributes (i.e. variables such as size statistics) on the same factorial axes. It is again revealed that sorting does not co-vary with kurtosis suggesting bimodal size distribution.
Keywords
Factor Analysis, Correspondence Analysis, Sediments, Gujarat Coast.- Hot Springs of Demchok, Ladakh, India
Authors
1 Geological Survey of India, Northern Region, Lucknow 226 024, India; Institute of Science, Banaras Hindu University, Varanasi 221 005, India., IN
2 ONGC Energy Centre, SCOPE Minar, Lakshmi Nagar, Delhi 110 092, India., IN
3 Geological Survey of India, Central Region, Nagpur 440 006, India., IN
4 Geological Survey of India, Northern Region, Lucknow 226 024, India., IN
5 Geological Survey of India, Gangtok 737 101, India., IN
Source
Current Science, Vol 124, No 9 (2023), Pagination: 1104-1107Abstract
In this study, two thermal springs are reported from the Demchok area in Ladakh, India. These are characterized by water having low total dissolved solids (TDS) content (~250 mg/l) as well as high pH (9.5) and surface temperature (75°C). Although these hot springs and their medicinal properties are known to locals, they have not been scientifically studied. Relatively low TDS despite high temperature could be due to sluggish ion-exchange processes in the geothermal reservoir. Such a situation might have developed because of the high water-to-rock ratio and/or smaller residence time of the geothermal fluid in the reaction zone.Keywords
Geothermal Zone, Hot Springs, Ion-Exchange Process, Medicinal Properties, Water–Rock Ratio.Full Text
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