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Yadava, M. G.
- Fertile Farmlands in Cauvery Delta: Evolution through LGM
Abstract Views :258 |
PDF Views:98
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
- First Results from the PRL Accelerator Mass Spectrometer
Abstract Views :248 |
PDF Views:81
Authors
Ravi Bhushan
1,
M. G. Yadava
1,
Manan S. Shah
1,
Upasana S. Banerji
1,
Harsh Raj
1,
Chinmay Shah
1,
Ankur J. Dabhi
1
Affiliations
1 Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
1 Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
Source
Current Science, Vol 116, No 3 (2019), Pagination: 361-363Abstract
No Abstract.Keywords
No Keywords.Full Text
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- Addressing Past Monsoon Variability from Speleothems
Abstract Views :236 |
PDF Views:73
Authors
Affiliations
1 Geoscience Department, National Taiwan University, Taipei, TW
2 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Geoscience Department, National Taiwan University, Taipei, TW
2 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 244-254Abstract
Numerous observations indicate that speleothems can record signatures of the past climate variability. Systematics of stable isotopes and trace elements in speleothems and current methods of dating are discussed. δ 18O in Indian speleothems is presently being used as a monsoon proxy. Several records from Indian karst locations are available, many of these cover recent several millennia and some extend back to ~280 ka. Salient features of monsoon variability reconstructed so far from Indian speleothems is briefly discussed. Some of the δ 18O records show presence of non-persistent periodic changes suggesting controls of subtle variations in solar output and internal changes in the climate system.Keywords
Indian Monsoon, Palaeoclimate, Periodic Analysis, Speleothem.Full Text
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- Sheela Kusumgar (1939–2020)
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Authors
Affiliations
1 Geosciences Division, Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, IN
1 Geosciences Division, Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 405-405Abstract
No Abstract.Full Text