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Singh, Pramod
- Fertile Farmlands in Cauvery Delta: Evolution through LGM
Abstract Views :260 |
PDF Views:99
Authors
Pramod Singh
1,
M. G. Yadava
2,
Malik Z. Ahmad
1,
P. P. Mohapatra
1,
A. H. Laskar
2,
S. Doradla
1,
J. Saravanavel
3,
C. J. Kumanan
3
Affiliations
1 Department of Earth Sciences, School of Physical, Chemical and Applied Sciences, Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, IN
2 Geoscience Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
3 Centre for Remote Sensing, Bharathidasan University, Khajamalai Campus, Tiruchirappalli 620 023, IN
1 Department of Earth Sciences, School of Physical, Chemical and Applied Sciences, Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, IN
2 Geoscience Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
3 Centre for Remote Sensing, Bharathidasan University, Khajamalai Campus, Tiruchirappalli 620 023, IN
Source
Current Science, Vol 108, No 2 (2015), Pagination: 218-225Abstract
The Cauvery delta encompasses legendary farmlands for at least over the last ~2300 years BP that had supported the growth of the famous Chola and Pandya kingdoms. The chrono-stratigraphic study from six sediment cores taken from the Cauvery basin indicates Holocene evolution of the present delta in response to the past sea-level changes. It is found that at the time of lower sea level during the Last Glacial Maximum, older sediments from the present delta plain, were removed and the extent of removal in different parts was observed to have been controlled by the variation in shelf morphology. Subsequent sealevel rise during the deglaciation after the Last Glacial Maximum, led to filling of the incised valleys with the younger sediments of the Holocene. Nilgiri- Kodaikanal-Palani-Biligirirangan hills granulites and Brahmagiri regions constitute the upper catchment. Geochemistry of the sediments indicates presence of plagioclase and dominance of 2:1 clay, suggesting weathering-limited provenance of southern granulitetype rocks, the source of which is perhaps the high relief and tectonically more active Nilgiri-Kodaikanal- Palani-Biligirirangan hills mountain region rather than the Brahmagiri region. A continuous deposition since the beginning of the Holocene has resulted in the formation of fertile farmlands in the Cauvery delta region.Keywords
Cauvery, Delta, Farmlands, Holocene Evolution, Sea-Level Change.Full Text
- 10Be/9Be Ratios of Cauvery River Delta Sediments, Southern India:Implications for Palaeo-Denudation Rates in the Catchment and Variation in Summer Monsoon Rainfall During Late Quaternary
Abstract Views :199 |
PDF Views:80
Authors
Soumya Prakash Dhal
1,
S. Balakrishnan
2,
Pankaj Kumar
3,
Pramod Singh
2,
Alok Sharan
1,
Sundeep Chopra
3
Affiliations
1 Department of Physics, Pondicherry University, Puducherry 605 014, IN
2 Department of Earth Sciences, Pondicherry University, Puducherry 605 014, IN
3 Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110 067, IN
1 Department of Physics, Pondicherry University, Puducherry 605 014, IN
2 Department of Earth Sciences, Pondicherry University, Puducherry 605 014, IN
3 Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110 067, IN
Source
Current Science, Vol 115, No 9 (2018), Pagination: 1770-1781Abstract
Present and past denudation rates (D) of the Cauvery river catchment determined using meteoric 10Be/9Be on drill-core sediment samples from Uttarangudi and Valangaiman sites in the delta vary from 18.7 ± 1.6 to 48.1 ± 8.3 t/km2/a. The present day denudation rates of 37.7 ± 4.9 t/km2/a and 36.9 ± 5.2 t/km2/a estimated for these sites are higher by a factor of two than that based on solute and suspended load of the Cauvery river. Denudation rates estimated using 10Be/9Be (reactive) is more accurate as it is not affected by damming of rivers. Based on 9Be fraction (reactive + dissolved) and previous studies, we infer that sediments for Valangaiman site were mainly sourced from Western Ghats and Mysore plateau, whereas highlands bordering southwestern margin of the delta mostly supplied sediments to the Uttarangudi site. The Western Ghats and the delta received rainfall mainly during summer monsoon and NE monsoon respectively. Comparison of palaeo-denudation rates with various proxies of the Indian summer monsoon shows inverse relationship between them. Lower denudation rates are estimated for Early to Mid-Holocene period which is characterized by intense rainfall. Drier conditions after 4.5 ka BP caused increase in denudation rates after 2.5 ka BP for the Valangaiman core, consistent with a response time of 2 ka required to change 10Be/9Be in sediments of the Cauvery basin.Keywords
Cauvery Delta, Denudation Rate, Holocene, Meteoric 10Be/9Be, Sediment Cores, Summer Monsoon.Full Text
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