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Ghosh, Prosenjit
- Carbon and Oxygen Isotopic Compositions of Carbonate Concretions of the Talchir formation and their Palaeo-Environmental Implications
Abstract Views :173 |
PDF Views:129
Authors
Affiliations
1 Plot 283, 17th East Street, Kamraj Nagar, Tiruvenmiyur, Chennai - 600041, IN
2 Physical Research Laboratory, Ahmedabad - 380 009, IN
3 Indian Institute of Technology, Kharagpur - 721 302, IN
1 Plot 283, 17th East Street, Kamraj Nagar, Tiruvenmiyur, Chennai - 600041, IN
2 Physical Research Laboratory, Ahmedabad - 380 009, IN
3 Indian Institute of Technology, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 633-633Abstract
No Abstract.Full Text
- Carbon and Oxygen Isotopic Compositions of Carbonate Concretions of the Talchir formation and their Palaeoenvironmental Implications
Abstract Views :203 |
PDF Views:2
Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad - 380 009, IN
2 Indian Institute of Technology, Kharagpur - 721 302, IN
1 Physical Research Laboratory, Ahmedabad - 380 009, IN
2 Indian Institute of Technology, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 6 (2002), Pagination: 677-686Abstract
Ubiquitous presence of carbonate rich nodules in glaciogene sediments of various Permo-Carboniferous basins (Talchir) in peninsular India offers promise for delineating the climatic condition and environment of deposition at that time. Isotopic composition of carbon and oxygen have been determined in carbonate nodules collected from the basal formation (Talchir) of three Gondwana basins of east-central India along with a few samples from contemporaneous Dwyka tillite of South Africa. Petrographic, cathodoluminescence and sedimentary evidences suggest that many of these nodules contain primary carbonate precipitates and therefore their geochemical signatures can be used for palaeoclimatic inference. The mean δ180 and δ13C values of the calcites in the nodules are 10.8% w.r.t. SMOW and - 9.7%0 w.r.t. PDB respectively, suggesting a freshwater environment (probably lacustrine) for formation of these concretions. The mean oxygen isotopic composition of meteoric water at that time (Early Permian) and location (70° S palaeolatitude) estimated from δ18Oof calcite is -22.7%0 and is depleted by a few per mil from the expected isotopic composition of precipitation at this latitude. This depletion can be interpreted either in terms of an amount effect due to enhanced rainfall or an altitude effect if the precipitation occurred at high altitude (as expected for development of the Talchir glacier).Keywords
Carbon and Oxygen isotopes, Carbonate concretions, Talchir formation, Eastern India.
- Effect of Charring on Rice Grain Morphology and Carbon Isotopic Composition
Abstract Views :245 |
PDF Views:80
Authors
Affiliations
1 Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, IN
2 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, IN
2 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 118, No 7 (2020), Pagination: 1052-1059Abstract
Rice cultivation over Asia has several thousand years of history. Adequate water availability is a prime factor for the cultivation of rice in this region. The remains of rice at the archaeological sites, therefore, provide an indirect clue on rainfall in this region. The stable isotopic compositions in remains of rice grains allow estimation of rainfall condition during rice cultivation. Often, such remains found at the archaeological sites suffer from the process of charring, which is likely to modify the original isotopic signature. Here, we performed charring experiments on rice grains at two different temperatures, i.e. 230°C and 250°C and documented the changes in the morphology and carbon isotopic composition (δ13C). A noticeable morphological shift was registered in the samples with progressive duration and temperature of charring. Further, cellulose was extracted and analysed for δ13C. Our results showed that the shift in δ13C observed for charred rice was relatively lower as compared to that observed in other cereals.Keywords
Charring, Palaeoclimate Proxy, Rice, Stable Carbon Isotope.Full Text
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Abstract Views :229 |
PDF Views:76
Authors
Affiliations
1 Interdisciplinary Centre for Water Research, Indian Institute of Science, Bengaluru 560 012, IN
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Interdisciplinary Centre for Water Research, Indian Institute of Science, Bengaluru 560 012, IN
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 265-272Abstract
Indian Summer Monsoon is an integrated component of the global climate system. The spatial movement of ITCZ at seasonal and orbital time scales is revealed in the ensemble of terrestrial and marine records covering the last 50,000 years. We deduced an evolutionary shift in the precipitation pattern near western North America, Mediterranean and South East Asia based on the estimated water isotopic composition from the δ18Ocarbonate and Δ47 thermometer. Record revealed three stages of climate transition: mid-Holocene optima, Younger Dryas and Last glacial maxima. Estimated mean arid air temperature was 9–21°C and 12–35°C during the glacial and interglacial periods respectively. The June summer solar insolation at 65°N is captured in the temperature record linked with ice volume, atmospheric CO2 levels and sea surface temperature; factors influencing the monsoon precipitation near mid-latitude region worldwide.Keywords
Clumped Isotopes, Monsoon, Orbital Forcing.Full Text