Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution
The Western Dharwar Craton (WDC) exhibits numerous exposures of NNW–SSE to NW–SE trending mafic dykes. Geochemistry of four 2.21 Ga NNW–NW trending dykes and 21 other similar trending dykes provides new insights into the geochemical behaviour, mantle source characteristics, and tectonic history of m...
Published in: | Geological Journal |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4109 |
id |
crwiley:10.1002/gj.4109 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/gj.4109 2024-03-31T07:53:06+00:00 Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution Yadav, Pooja Sarma, Drona Srinivasa 2021 http://dx.doi.org/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4109 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geological Journal volume 56, issue 7, page 3497-3522 ISSN 0072-1050 1099-1034 Geology journal-article 2021 crwiley https://doi.org/10.1002/gj.4109 2024-03-04T13:01:35Z The Western Dharwar Craton (WDC) exhibits numerous exposures of NNW–SSE to NW–SE trending mafic dykes. Geochemistry of four 2.21 Ga NNW–NW trending dykes and 21 other similar trending dykes provides new insights into the geochemical behaviour, mantle source characteristics, and tectonic history of mafic magmatic event, which have also affected the Eastern Dharwar Craton (EDC). Based on modal mineralogy and texture, these dykes can be classified into dolerite, olivine dolerite, gabbro, and olivine gabbro. They show basaltic to basaltic‐andesitic composition and have sub‐alkaline tholeiitic nature. La N /Lu N ratio classifies the dykes into two groups: Group I, with values close to 2, shows relatively flat REE patterns while, Group II, with values 4–6, has inclined REE patterns. In general, both groups show LREE enrichment and most of the samples exhibit negative Nb–Ta and Ti anomalies, indicating crustal contamination. However, negative Zr–Hf anomaly and low Th/Nb values (0.14–0.73) noticed within the samples preclude significant crustal inputs. Petrogenetic modelling using batch melting equation suggests that the dykes fractionated from two distinct mantle melts and had slightly different sources, both within the spinel–garnet transition zone. The overall composition of these 2.21 Ga dykes is consistent with a mantle plume‐induced heterogeneous source that was previously modified by some ancient subduction event. Coeval dykes from EDC exhibit similar geochemical behaviour, mantle source characteristics, and tectonic history. These and other synchronous dykes from distant cratons, viz. Superior, Slave, Greenland, represent a 2.21 Ga large igneous province event, which is linked with the Sclavia/Superia supercraton. Article in Journal/Newspaper Greenland Wiley Online Library Greenland Geological Journal 56 7 3497 3522 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Geology |
spellingShingle |
Geology Yadav, Pooja Sarma, Drona Srinivasa Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
topic_facet |
Geology |
description |
The Western Dharwar Craton (WDC) exhibits numerous exposures of NNW–SSE to NW–SE trending mafic dykes. Geochemistry of four 2.21 Ga NNW–NW trending dykes and 21 other similar trending dykes provides new insights into the geochemical behaviour, mantle source characteristics, and tectonic history of mafic magmatic event, which have also affected the Eastern Dharwar Craton (EDC). Based on modal mineralogy and texture, these dykes can be classified into dolerite, olivine dolerite, gabbro, and olivine gabbro. They show basaltic to basaltic‐andesitic composition and have sub‐alkaline tholeiitic nature. La N /Lu N ratio classifies the dykes into two groups: Group I, with values close to 2, shows relatively flat REE patterns while, Group II, with values 4–6, has inclined REE patterns. In general, both groups show LREE enrichment and most of the samples exhibit negative Nb–Ta and Ti anomalies, indicating crustal contamination. However, negative Zr–Hf anomaly and low Th/Nb values (0.14–0.73) noticed within the samples preclude significant crustal inputs. Petrogenetic modelling using batch melting equation suggests that the dykes fractionated from two distinct mantle melts and had slightly different sources, both within the spinel–garnet transition zone. The overall composition of these 2.21 Ga dykes is consistent with a mantle plume‐induced heterogeneous source that was previously modified by some ancient subduction event. Coeval dykes from EDC exhibit similar geochemical behaviour, mantle source characteristics, and tectonic history. These and other synchronous dykes from distant cratons, viz. Superior, Slave, Greenland, represent a 2.21 Ga large igneous province event, which is linked with the Sclavia/Superia supercraton. |
format |
Article in Journal/Newspaper |
author |
Yadav, Pooja Sarma, Drona Srinivasa |
author_facet |
Yadav, Pooja Sarma, Drona Srinivasa |
author_sort |
Yadav, Pooja |
title |
Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
title_short |
Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
title_full |
Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
title_fullStr |
Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
title_full_unstemmed |
Geochemistry of 2.21 Ga giant radiating dyke swarm from the Western Dharwar Craton, India: Implications for petrogenesis and tectonic evolution |
title_sort |
geochemistry of 2.21 ga giant radiating dyke swarm from the western dharwar craton, india: implications for petrogenesis and tectonic evolution |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4109 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4109 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geological Journal volume 56, issue 7, page 3497-3522 ISSN 0072-1050 1099-1034 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/gj.4109 |
container_title |
Geological Journal |
container_volume |
56 |
container_issue |
7 |
container_start_page |
3497 |
op_container_end_page |
3522 |
_version_ |
1795032589257408512 |