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- Richard W. Ojakangas
- V. S. Hegde
- S. M. Chandrakant
- S. V. Srikantia
- Shijo Zacharia
- R. Seshasayanan
- T. Thamarai
- Tata Sudhakar
- R. R. Rao
- M. A. Atmanand
- Subrata Das Sharma
- Bidyananda Maibam
- Axel Gerdes
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- Deepak Salim
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- M. Rajesh Kumar
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Journals
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Srinivasan, R.
- The Talya Conglomerate: an Archean (∼2.7 Ga) Glaciomarine formation, Western Dharwar Craton, Southern India
Abstract Views :256 |
PDF Views:93
Authors
Affiliations
1 Department of Geological Sciences, University of Minnesota Duluth, Duluth, Minnesota 55812, US
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 SDM College of Engineering and Technology, Dharwad 580 002, IN
4 No. 201A-Block, Ushas Apartment, 26 Cross, 16th Main, IV Block, Jayanagar, Bengalaru 560 011, IN
1 Department of Geological Sciences, University of Minnesota Duluth, Duluth, Minnesota 55812, US
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 SDM College of Engineering and Technology, Dharwad 580 002, IN
4 No. 201A-Block, Ushas Apartment, 26 Cross, 16th Main, IV Block, Jayanagar, Bengalaru 560 011, IN
Source
Current Science, Vol 106, No 3 (2014), Pagination: 387-396Abstract
The ∼2700 Ma Talya Conglomerate is Comprised of 15 Diamictites (i.e. Matrix-supported Conglomerates) Interbedded with Mudstone and Sandstone Units, and is Interpreted as a Glaciomarine Deposit. the Entire Thickness of This Conglomeratic Member within the Vanivilas formation, the Lowest formation of the Chitradurga Group of the Neoarchean Dharwar Supe Rgroup, is Exposed in a 543 M-thick Measured Section. it is in a Sub-vertical Attitude, is Highly Sheared, and has Undergone Greenschist Facies Metamorphism. the Diamictites had an Original Matrix of Laminated Mud/Silt and Fine Sand. while Including Diamictites Throughout, the Talya is a Fining-upward Sequence with Intercalated Sandstones Dominant in its Lower Portion and Mudstones Dominant in its Upper Portion. we Interpret that the Talya Conglomerate was Deposited in a Marine Environment, with Diamictites Composed of Ice-rafted Detritus (ird) Deposited from Icebergs Calved from Tidewater Glacier Tongues And/or possibly from Ice Shelves. in these 'rainout Diamictites' the Larger Clasts were Dropped into Finegrained Bottom Sediment Deposited by Sediment Plumes and Currents. the Source Ice Sheet was Located to the West and Southwest on a Land Mass that Included the Older than 2720 Ma Bababudan Group of Quartzites and Mafic Volcanics and Older than 3000 Ma Basement of Granitic/gneissic Rocks. Application of Walther's Law Indicates that the Mudstonebearing Portion of the Talya was Deposited upon the Sandstone-bearing Portion as the Sea further Inundated the Land Mass Due to Glacial Retreat and a Decrease in Glacial Mass, thereby Resulting in the Fining- upward Nature of the Talya Conglome Rate. we also Interpret the Lower Portion of the Kaldurga Conglomerate, Located 50-75 Km to the Southwest of the Talya, to be Equivalent with the Talya. the Kaldurga Contains mostly Granitic Basement Detritus, perhaps Exposed Due to Basement Uplift Related to Isostatic Rebound Caused by Glacial Melting or Due to Tectonism Related to Westward Subduction.Keywords
Archean, Diamictites, Dropstones, Dharwar Craton, Glaciomarine Deposit.Full Text
- Design, Development and Validation of Smart Sensor Drifting Node with INSAT Telemetry for Oceanographic Applications
Abstract Views :274 |
PDF Views:106
Authors
Shijo Zacharia
1,
R. Seshasayanan
2,
R. Srinivasan
1,
T. Thamarai
1,
Tata Sudhakar
1,
R. R. Rao
1,
M. A. Atmanand
1
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
Source
Current Science, Vol 106, No 6 (2014), Pagination: 831-840Abstract
Drifter buoys are globally deployed to measure surface meteorological and oceanographic variables. A Lagrangian drifting buoy (Pradyu II) to measure sea-surface temperature and current has been developed at the National Institute of Ocean Technology, Chennai. The drifter buoy with geostationary satellite communication (INSAT-3C) to have near real-time data at every hour is a unique attempt in the history of drifting buoy nodes. This article describes Pradyu II drifting buoy node, design of low-power embedded system, communication network and field test results from an experiment conducted in the Bay of Bengal during March-April 2013. The results from Pradyu II are compared with commercially available drifting buoy (Marlin-Yug), moored data buoy (BD11) and remotely sensed data.Keywords
Drifting Buoy, Embedded System, Seasurface Temperature, Sensor Node.Full Text
- International World Water Day 2014, Focus: Water-Energy Nexus
Abstract Views :262 |
PDF Views:82
Authors
Source
Current Science, Vol 106, No 7 (2014), Pagination: 911-912Abstract
No Abstract.Full Text
- Stable Isotope Evidence for Ca. 2.7-Ga-Old Archean Cap Carbonates from the Dharwar Supergroup, Southern India
Abstract Views :250 |
PDF Views:82
Authors
Affiliations
1 CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
1 CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 108, No 12 (2015), Pagination: 2223-2229Abstract
Carbon isotope compositions of carbonate rocks from ~2.7-Ga-old Neoarchean Vanivilas Formation of the Dharwar Supergroup presented earlier by us are reevaluated in this study, besides oxygen isotope compositions of a few silica-dolomite pairs. The purpose of such a revisit assumes significance in view of recent field evidences that suggest a glaciomarine origin for the matrix-supported conglomerate member, the Talya conglomerate, which underlies the carbonate rocks of the Vanivilas Formation. An in-depth analysis of carbon isotope data reveals preservation of their pristine character despite the rocks having been subjected to metamorphism to different degrees (from lower greenschist to lower amphibolite facies). The dolomitic member of Vanivilas Formation of Marikanive area is characterized by highly depleted δ13C value (up to -5‰ VPDB) and merits as the Indian example of ca. 2.7-Ga-old cap carbonate. This inference is further supported by estimated low temperature of equilibration documented by a few silica-dolomite pairs from the Vanivilas Formation collected near Kalche area. These pairs show evidence for oxygen isotopic equilibrium at low temperatures (~0-20°C) with depleted water (δ18O = -21‰ to -15‰ VSMOW) of glacial origin. We propose that the mineral pairs were deposited during the deglaciation period when the ocean temperature was in its gradual restoration phase. The dolomite of Marikanive area is the first record of cap carbonates from the Indian subcontinent with Neoarchean antiquity.Keywords
Carbonate Rocks, Carbon and Oxygen Isotopes, Dharwar Craton, Glaciomarine Deposit, Neoarchean.Full Text
- What Ails Physics Education in the Country?
Abstract Views :383 |
PDF Views:88
Authors
Affiliations
1 143, V Cross, II Main, I Stage, Vijayanagar Extension, Mysuru 570 017, IN
1 143, V Cross, II Main, I Stage, Vijayanagar Extension, Mysuru 570 017, IN
Source
Current Science, Vol 108, No 10 (2015), Pagination: 1771-1772Abstract
No Abstract.Full Text
- Plant Biochemistry: Techniques and Procedures
Abstract Views :210 |
PDF Views:94
Authors
Affiliations
1 National Research Centre on Plant Biotechnology, LBS Centre, IARI Campus, New Delhi 110 012, IN
1 National Research Centre on Plant Biotechnology, LBS Centre, IARI Campus, New Delhi 110 012, IN
Source
Current Science, Vol 110, No 4 (2016), Pagination: 722-723Abstract
No Abstract.Full Text
- U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution
Abstract Views :342 |
PDF Views:80
Authors
Affiliations
1 Department of Earth Sciences, Manipur University, Imphal 795 003, IN
2 Institute of Geosciences, Mineralogy, J.W. Goethe University, Frankfurt 60438, DE
3 Centre for Atmospheric and Ocean Sciences, Indian Institute of Science, Bengaluru 560 012, IN
4 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Department of Earth Sciences, Manipur University, Imphal 795 003, IN
2 Institute of Geosciences, Mineralogy, J.W. Goethe University, Frankfurt 60438, DE
3 Centre for Atmospheric and Ocean Sciences, Indian Institute of Science, Bengaluru 560 012, IN
4 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 113, No 07 (2017), Pagination: 1394-1402Abstract
A study of U–Pb and Lu–Hf–Yb isotope data in zircons from metamorphosed psammopelite and quartzite from the type area of Archaean Sargur Group, Dharwar Craton, India is carried out. Two age populations are observed: an older population with concordant U–Pb ages between 2.7 and 2.8 Ga, and a younger population with ages in the 2.4–2.6 Ga age range. The εHf values of 0 to +2.0 for the older zircon population suggest that they were derived from juvenile crust formed at 2.7–2.8 Ga. Sub-chondritic εHf values for the younger population indicate metamorphism and/or crustal reworking at ~2.5 Ga. Metasedimentary enclaves in the Sargur type area are therefore part of the gneiss–supracrustal complex of different antiquities and may not have an independent stratigraphic status.Keywords
Detrital Zircon, High- and Low-Grade Metamorphism, Isotope Analysis, Supracrustal Rocks.Full Text
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- Fall Armyworm in Africa:Which ‘Race’ is in the Race, and Why Does it Matter?
Abstract Views :241 |
PDF Views:76
Authors
Affiliations
1 World Vegetable Center, Shanhua, Tainan, TW
2 World Vegetable Center, Eastern and Southern Africa, P.O. Box 10, Duluti, Arusha, TZ
1 World Vegetable Center, Shanhua, Tainan, TW
2 World Vegetable Center, Eastern and Southern Africa, P.O. Box 10, Duluti, Arusha, TZ
Source
Current Science, Vol 114, No 01 (2018), Pagination: 27-28Abstract
Fall armyworm (Spodoptera frugiperda) has already invaded almost half of Africa since its first observation in the continent in January 2016. At its current rate of invasion, the pest may conquer Africa before the end of 2017. Although this polyphagous pest feeds on more than 80 plant species, it is considered to be a ‘pest of grasses’, because of its overwhelming preference for Poaceae (or Gramineae).Full Text
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Abstract Views :235 |
PDF Views:90
Authors
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, IN
2 Vels University, School of Engineering, Electronics and Communication Engineering Department, Pallavaram, Chennai - 600 117, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, IN
2 Vels University, School of Engineering, Electronics and Communication Engineering Department, Pallavaram, Chennai - 600 117, IN
Source
Current Science, Vol 115, No 2 (2018), Pagination: 325-330Abstract
A precise and accurate ocean temperature measurement system is essential for better understanding and knowledge of the spatial and temporal variability of thermal stratification of the upper-ocean layers is fundamental. The National Institute of Ocean Technology, Chennai has indigenously developed a novel negative temperature coefficient (NTC) thermistor based sensor array with RS232 digital output for drifting buoy (Pradyu) (DB) wherein, it is mainly used in ocean observation applications. The DB is built with Indian satellite (INSAT) for real time data telemetry.
The NTC sensing element is used in developing the temperature sensor for the measurement of sea surface layer temperature. The Steinhart–Hart equation and coefficients are applied on each sampling to zero down the error components involved in temperature measurements which corresponds to the nonlinear functionality of the NTC element. In-house developed SST sensor and sensor array are calibrated and extensively tested in laboratory conditions. The results of the SST and sensor array laboratory calibrations and field validations are briefly presented here with significant data sets collected in the Bay of Bengal warm pool regions.
Keywords
Drifting Buoy, NTC Thermistor Sensor, Sensor Array, Steinhart–Hart Coefficients.Full Text
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- Ocean Current Mapping with Indigenous Drifting Buoys
Abstract Views :145 |
PDF Views:83
Authors
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
Source
Current Science, Vol 118, No 11 (2020), Pagination: 1778-1781Abstract
Ocean current transports mass and energy around the world and it is the driving force of climate and it regulates local weather. Drifting buoy plays an important role in mapping world’s ocean water circulations and its study. The National Institute of Ocean Technology (NIOT), MoES, Chennai has indigenized drifting buoy with the Indian Satellite (INSAT) telemetry and global positioning system receiver to acquire geo-positional updates to precisely calculate ocean’s mixed layer surface current. The drifting buoy acquires hourly positional data (24 data/day) compared to ARGOS drifters which has limited pass in Indian tropical regions. The NIOT deployed drifting buoy in the Bay of Bengal and the Arabian Sea during monsoon seasons of 2012–2019 to study the Indian Ocean currents. This article reports about the mixed layer surface currents mapped by the indigenous drifting buoy in the Bay of Bengal.Keywords
Drifting Buoy, GPS Receiver, Mixed Layer Surface Currents, Mesoscale Eddies.Full Text
References
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- Instrumental Lives: An Intimate Biography of an Indian Laboratory
Abstract Views :202 |
PDF Views:84
Authors
Affiliations
1 Res. 143, V Cross, III Main Road, Vijayanagar Extension, Mysuru 570 017, IN
1 Res. 143, V Cross, III Main Road, Vijayanagar Extension, Mysuru 570 017, IN
Source
Current Science, Vol 119, No 10 (2020), Pagination: 1712-1713Abstract
No Abstract.Full Text
- Water Security issues of India
Abstract Views :248 |
PDF Views:73
Authors
Affiliations
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 119, No 9 (2020), Pagination: 1395-1396Abstract
No Abstract.Full Text
- Strengthening Geological Prospecting Capabilities in India to Meet the Aims of The New National Mineral Policy
Abstract Views :186 |
PDF Views:78
Authors
Affiliations
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 120, No 12 (2021), Pagination: 1803-1804Abstract
No Abstract.Keywords
No Keywords.Full Text
- High Uranium Concentration in Groundwater Used for Drinking in Parts of Eastern Karnataka, India
Abstract Views :183 |
PDF Views:73
Authors
R. Srinivasan
1,
S. A. Pandit
1,
N. Karunakara
2,
Deepak Salim
1,
K. Sudeep Kumara
2,
M. Rajesh Kumar
1,
Ganesh Khatei
1,
Kavitha Devi Ramkumar
1
Affiliations
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
2 Centre for Advanced Research in Environmental Radioactivity, Mangalore University, Mangala Gangothri, Mangalore 574 199, IN
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
2 Centre for Advanced Research in Environmental Radioactivity, Mangalore University, Mangala Gangothri, Mangalore 574 199, IN
Source
Current Science, Vol 121, No 11 (2021), Pagination: 1459-1469Abstract
The limits recommended by World Health Organization (WHO) and the Atomic Energy Regulatory Board (AERB) of India for uranium concentration in drinking water are 30 μg/l and 60 μg/l respectively. The present study on uranium concentration in groundwater used for drinking purposes in 73 villages of Karnataka, India, shows that in 57 villages uranium concentration is more than 30 μg/l, including 48 villages where it exceeds 60 μg/l. Thus in 78% and 66% of the villages studied, uranium concentration exceeds permissible limits given by WHO and AERB respectively. It is alarming to note that in one village each in Tumkur and Chitradurga districts, five in Kolar and seven in Chikkaballapura districts, uranium concentration is in thousands of micrograms per litre. None of the borewells from which water has been sampled is anywhere in the vicinity of nuclear facilities or urban waste disposal channels. Thus, the observed uranium contamination is considered to be geogenic. Previous geological studies have shown that the eastern portion of Karnataka is a part of the Neoarchean Eastern Dharwar Craton dominated by large ion lithophile element-rich K-feldspar granites and gneisses with higher abundance of radioactive elements (uranium and thorium) compared to the Mesoarchean tonalite–trondhjemite–gneisses and granitoids widely distributed in the Western Dharwar Craton.Keywords
Dharwar Craton, Geogenic Contamination, Groundwater, Uranium.Full Text
References
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- Reverse osmosis units in groundwater based public water supply system in rural eastern Karnataka, India: an analysis
Abstract Views :161 |
PDF Views:72
Authors
R. Srinivasan
1,
S. A. Pandit
1,
Ganesh Khatei
1,
N. Karunakara
2,
K. Sudeep Kumara
2,
Jean Riotte
3,
Hemant Moger
4,
P. Amala David
1,
Manoj Jindal
1,
G. Gowrisankar
1,
Kavitha Devi Ramkumar
1
Affiliations
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, India, IN
2 Centre for Advanced Research in Environmental Radioactivity, Mangalore University, Mangala Gangothri, Mangaluru 574 199, India, IN
3 Indo-French Cell for Water Sciences, Indian Institute of Science, Bengaluru 560 012, India; Geosciences Environment Toulouse, 31400 Toulouse, France, IN
4 Indo-French Cell for Water Sciences, Indian Institute of Science, Bengaluru 560 012, India, IN
1 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, India, IN
2 Centre for Advanced Research in Environmental Radioactivity, Mangalore University, Mangala Gangothri, Mangaluru 574 199, India, IN
3 Indo-French Cell for Water Sciences, Indian Institute of Science, Bengaluru 560 012, India; Geosciences Environment Toulouse, 31400 Toulouse, France, IN
4 Indo-French Cell for Water Sciences, Indian Institute of Science, Bengaluru 560 012, India, IN
Source
Current Science, Vol 123, No 12 (2022), Pagination: 1493-1498Abstract
Adequacy, eco-friendliness and desirability of continuation of reverse osmosis (RO) purification of groundwater for providing safe drinking water to villages in the groundwater resource-deficient eastern Karnataka, India, have been studied in 15 villages in 4 districts of the state, where high fluoride and uranium contamination has been observed. The results indicate that: (i) except in Chitradurga district, there are an inadequate number of RO facilities; (ii) RO water consumption is far less than the minimum amount recommended for drinking by WHO; (iii) while the benchmark of the best performance for RO membranes is >99%, the RO units in use show an average fluoride and uranium rejection percentage of 92.6 and 95.1 respectively; and (iv) similar to almost all RO units, the installed ones are also wasting water in the water-deficient eastern Karnataka and discharging concentrate with a higher percentage of contaminants into the environment. Better management of RO units and RO concentrate is required.Keywords
Contaminants, environmental friendliness, groundwater, reverse osmosis, sustainable rural water supply.Full Text
References
- CGWB, Groundwater Yearbook of Karnataka, Central Ground Water Board, Bengaluru, 2020–21, pp. 1–190.
- GoI, Uranium occurrence in shallow aquifers in India. Central Ground Water Board, River Development and Ganga Rejuvenation, Department of Water Resources, Ministry of Jal Sakthi, Government of India, 2020, pp. 1–58.
- Coyte, R. M., Jain, R. C., Srivastava, S. K., Sharma, K. C., Khalil, A., Ma, L. and Vengosh, A., Large-scale uranium contamination of groundwater resources in India. Environ. Sci. Technol. Lett., 2018, 5, 341–347; https://doi.org/10.1021/acs.estlett.8b00215.
- Sahoo, S., Jha, S., Jha, V., Patra, A. and Kulkarni, M., Survey of uranium in drinking water sources in India: interim observations. Curr. Sci., 2021, 120(9), 1482–1490; http://dx.doi.org/10.18520/cs/v120/i9/1482-1490.
- Srinivasan, R. et al., High uranium concentration in groundwater used for drinking in parts of eastern Karnataka, India. Curr. Sci., 2021, 121(11), 1459–1469; http://dx.doi.org/10.18520/cs/v121/i11/1459-1469.
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