Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis
A carbonate dominated shallow marine Proterozoic Bhima basin consists of carbonates and clastic rocks, and is widely distributed in the northern part of the Karnataka state, south India. Limestones of the Shahabad Formation have been selected for this study and secular variations in C, O, and Sr iso...
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| Format: | Journal Article |
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Universitatea de Nord din Baia Mare
2013
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| Online Access: | http://www.ubm.ro/sites/CJEES/viewTopic.php?topicId=316 http://hdl.handle.net/20.500.11937/18512 |
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| author | Nagarajan, Ramasamy Armstrong-Altrin, John Sial, Alcides Nagendra, Raghavendra Ellam, Rob |
| author_facet | Nagarajan, Ramasamy Armstrong-Altrin, John Sial, Alcides Nagendra, Raghavendra Ellam, Rob |
| author_sort | Nagarajan, Ramasamy |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A carbonate dominated shallow marine Proterozoic Bhima basin consists of carbonates and clastic rocks, and is widely distributed in the northern part of the Karnataka state, south India. Limestones of the Shahabad Formation have been selected for this study and secular variations in C, O, and Sr isotope compositions are reported. δ13C values are varying from +3.50 to -1.38‰PDB. Similarly, the δ18O values recorded a range between -5.76 and -12.93‰PDB 87Sr/86Sr ratio for these limestones is varying between 0.70699 and 0.7117. Higher burial rate of organic matter could have been responsible for the positive δ13C values, which is common in the Proterozoic carbonate rocks. The δ18O values in most of the samples are similar to the average value of the Proterozoic carbonate rocks. Albeit some of the samples are modified in their original isotopic signature, which shows high negative δ18O values < -10‰PDB, Mn/Sr ratios > 1.5 and a negative trend between δ18O and 87Sr/86Sr, suggesting that the δ18O and 87Sr/86Sr isotopic signatures of Bhima carbonates have been altered by diagenesis. The post depositional diagenetic alteration is also supported by the petrographic characters of these carbonates. |
| first_indexed | 2025-11-14T07:26:08Z |
| format | Journal Article |
| id | curtin-20.500.11937-18512 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:26:08Z |
| publishDate | 2013 |
| publisher | Universitatea de Nord din Baia Mare |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-185122017-01-30T12:08:16Z Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis Nagarajan, Ramasamy Armstrong-Altrin, John Sial, Alcides Nagendra, Raghavendra Ellam, Rob southern India Bhima Basin limestones diagenesis Stable isotopes A carbonate dominated shallow marine Proterozoic Bhima basin consists of carbonates and clastic rocks, and is widely distributed in the northern part of the Karnataka state, south India. Limestones of the Shahabad Formation have been selected for this study and secular variations in C, O, and Sr isotope compositions are reported. δ13C values are varying from +3.50 to -1.38‰PDB. Similarly, the δ18O values recorded a range between -5.76 and -12.93‰PDB 87Sr/86Sr ratio for these limestones is varying between 0.70699 and 0.7117. Higher burial rate of organic matter could have been responsible for the positive δ13C values, which is common in the Proterozoic carbonate rocks. The δ18O values in most of the samples are similar to the average value of the Proterozoic carbonate rocks. Albeit some of the samples are modified in their original isotopic signature, which shows high negative δ18O values < -10‰PDB, Mn/Sr ratios > 1.5 and a negative trend between δ18O and 87Sr/86Sr, suggesting that the δ18O and 87Sr/86Sr isotopic signatures of Bhima carbonates have been altered by diagenesis. The post depositional diagenetic alteration is also supported by the petrographic characters of these carbonates. 2013 Journal Article http://hdl.handle.net/20.500.11937/18512 http://www.ubm.ro/sites/CJEES/viewTopic.php?topicId=316 Universitatea de Nord din Baia Mare fulltext |
| spellingShingle | southern India Bhima Basin limestones diagenesis Stable isotopes Nagarajan, Ramasamy Armstrong-Altrin, John Sial, Alcides Nagendra, Raghavendra Ellam, Rob Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title | Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title_full | Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title_fullStr | Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title_full_unstemmed | Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title_short | Carbon, oxygen, and strontium isotope geochemistry of the Proterozoic carbonate rocks, Bhima basin, south India: Implication for diagenesis |
| title_sort | carbon, oxygen, and strontium isotope geochemistry of the proterozoic carbonate rocks, bhima basin, south india: implication for diagenesis |
| topic | southern India Bhima Basin limestones diagenesis Stable isotopes |
| url | http://www.ubm.ro/sites/CJEES/viewTopic.php?topicId=316 http://hdl.handle.net/20.500.11937/18512 |