Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes
Integrated petrological, geochemical, isotopic and thermobarometric study of metasedimentary rocks from the amphibolite- to granulite-facies transition zone of the Eastern Dharwar Craton (EDC), South India, has provided new insight into the evolution of the lower continental crust in this region. Ph...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Wiley
2023
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| _version_ | 1824458577686822912 |
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| author | Maibam, B Palin, RM Gerdes, A White, RW Berndt, J Foley, S Goswami, JN |
| author_facet | Maibam, B Palin, RM Gerdes, A White, RW Berndt, J Foley, S Goswami, JN |
| author_sort | Maibam, B |
| collection | OXFORD |
| description | Integrated petrological, geochemical, isotopic and thermobarometric study of metasedimentary rocks from the amphibolite- to granulite-facies transition zone of the Eastern Dharwar Craton (EDC), South India, has provided new insight into the evolution of the lower continental crust in this region. Phase equilibrium modelling of metapelites and metagreywackes suggests that they reached peak metamorphism at ~800–850°C and 6–7 kbar (corresponding to a paleodepth of ~20 km), with minor retrograde change occurring at ~700°C and 3–5 kbar during exhumation. U–Pb ages of conventionally separated zircon from metapelite samples range from 2.5 to 3.4 Ga, whereas garnet-hosted zircons yield younger ages of 2.5–2.7 Ga. Zircon Th/U ratios and Hf isotopes reveal several significant pulses of zircon growth at 3.0, 2.95 and 2.7 Ga. Hf isotope data suggest the evolution of juvenile magma at around 3.2 Ga, while Hf model ages show that the crust building process also involved the recycling of pre-existing Mesoarchean crust. Our study confirms the presence of a Paleoarchean component in the EDC lower crust, as well as older metamorphic events in the terrain and the gradational distribution of the metamorphic rocks. |
| first_indexed | 2024-09-25T04:01:32Z |
| format | Journal article |
| id | oxford-uuid:43547fef-606b-4e9e-b99c-1cb86b7307de |
| institution | University of Oxford |
| language | English |
| last_indexed | 2025-02-19T04:28:06Z |
| publishDate | 2023 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:43547fef-606b-4e9e-b99c-1cb86b7307de2024-12-12T10:11:35ZCrustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:43547fef-606b-4e9e-b99c-1cb86b7307deEnglishSymplectic ElementsWiley2023Maibam, BPalin, RMGerdes, AWhite, RWBerndt, JFoley, SGoswami, JNIntegrated petrological, geochemical, isotopic and thermobarometric study of metasedimentary rocks from the amphibolite- to granulite-facies transition zone of the Eastern Dharwar Craton (EDC), South India, has provided new insight into the evolution of the lower continental crust in this region. Phase equilibrium modelling of metapelites and metagreywackes suggests that they reached peak metamorphism at ~800–850°C and 6–7 kbar (corresponding to a paleodepth of ~20 km), with minor retrograde change occurring at ~700°C and 3–5 kbar during exhumation. U–Pb ages of conventionally separated zircon from metapelite samples range from 2.5 to 3.4 Ga, whereas garnet-hosted zircons yield younger ages of 2.5–2.7 Ga. Zircon Th/U ratios and Hf isotopes reveal several significant pulses of zircon growth at 3.0, 2.95 and 2.7 Ga. Hf isotope data suggest the evolution of juvenile magma at around 3.2 Ga, while Hf model ages show that the crust building process also involved the recycling of pre-existing Mesoarchean crust. Our study confirms the presence of a Paleoarchean component in the EDC lower crust, as well as older metamorphic events in the terrain and the gradational distribution of the metamorphic rocks. |
| spellingShingle | Maibam, B Palin, RM Gerdes, A White, RW Berndt, J Foley, S Goswami, JN Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title | Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title_full | Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title_fullStr | Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title_full_unstemmed | Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title_short | Crustal evolution of the amphibolite- to granulite-facies transition zone in the eastern Dharwar Craton, southern India: insight from petrological modelling, zircon U–Pb geochronology and Hf isotopes |
| title_sort | crustal evolution of the amphibolite to granulite facies transition zone in the eastern dharwar craton southern india insight from petrological modelling zircon u pb geochronology and hf isotopes |
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