Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India
Phase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt, southern India are presented here. The results suggest that the area attained peak P–T conditions of ~900 °C at 7.5–8 kbar, followed by decompres...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2020-03-01
|
Series: | Geoscience Frontiers |
Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987119301318 |
id |
doaj-3ef060867df44a3780563508d83c13a8 |
---|---|
record_format |
Article |
spelling |
doaj-3ef060867df44a3780563508d83c13a82020-11-25T02:35:55ZengElsevierGeoscience Frontiers1674-98712020-03-01112597611Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, IndiaNilanjana Sorcar0Kumar Batuk Joshi1Elson P. Oliveira2J.K. Tomson3V. Nandakumar4ESSO–National Centre For Earth Science Studies, Thiruvananthapuram, Kerala, IndiaESSO–National Centre For Earth Science Studies, Thiruvananthapuram, Kerala, India; Corresponding author.Department of Geology, Institute of Geosciences, University of Campinas, BrazilESSO–National Centre For Earth Science Studies, Thiruvananthapuram, Kerala, IndiaESSO–National Centre For Earth Science Studies, Thiruvananthapuram, Kerala, IndiaPhase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt, southern India are presented here. The results suggest that the area attained peak P–T conditions of ~900 °C at 7.5–8 kbar, followed by decompression to 3.5–5 kbar and cooling to 450–480 °C, preserving signatures of the partial melting event in the field of high to ultra-high temperature metamorphism. Melt reintegration models suggest that up to 35% granitic melt could have been produced during metamorphism at ~950 °C. The U–Pb age data from zircons (~1.0 – ~0.7 Ga) and chemical ages from monazites (~540 Ma and ~941 Ma) reflect a complex tectonometamorphic evolution of the terrain. The ~941 Ma age reported from these monazites indicate a Tonian ultra-high temperature event, linked to juvenile magmatism/deformation episodes reported from the Southern Granulite Terrane and associated fragments in Rodinia, which were subsequently overprinted by the Cambrian (~540 Ma) tectonothermal episode. Keywords: Kerala khondalite belt (KKB), Garnet-cordierite gneiss, Partial melting, Pseudosection, Monazite-zircon geochronologyhttp://www.sciencedirect.com/science/article/pii/S1674987119301318 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nilanjana Sorcar Kumar Batuk Joshi Elson P. Oliveira J.K. Tomson V. Nandakumar |
spellingShingle |
Nilanjana Sorcar Kumar Batuk Joshi Elson P. Oliveira J.K. Tomson V. Nandakumar Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India Geoscience Frontiers |
author_facet |
Nilanjana Sorcar Kumar Batuk Joshi Elson P. Oliveira J.K. Tomson V. Nandakumar |
author_sort |
Nilanjana Sorcar |
title |
Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India |
title_short |
Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India |
title_full |
Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India |
title_fullStr |
Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India |
title_full_unstemmed |
Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India |
title_sort |
characterization of partial melting events in garnet-cordierite gneiss from the kerala khondalite belt, india |
publisher |
Elsevier |
series |
Geoscience Frontiers |
issn |
1674-9871 |
publishDate |
2020-03-01 |
description |
Phase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt, southern India are presented here. The results suggest that the area attained peak P–T conditions of ~900 °C at 7.5–8 kbar, followed by decompression to 3.5–5 kbar and cooling to 450–480 °C, preserving signatures of the partial melting event in the field of high to ultra-high temperature metamorphism. Melt reintegration models suggest that up to 35% granitic melt could have been produced during metamorphism at ~950 °C. The U–Pb age data from zircons (~1.0 – ~0.7 Ga) and chemical ages from monazites (~540 Ma and ~941 Ma) reflect a complex tectonometamorphic evolution of the terrain. The ~941 Ma age reported from these monazites indicate a Tonian ultra-high temperature event, linked to juvenile magmatism/deformation episodes reported from the Southern Granulite Terrane and associated fragments in Rodinia, which were subsequently overprinted by the Cambrian (~540 Ma) tectonothermal episode. Keywords: Kerala khondalite belt (KKB), Garnet-cordierite gneiss, Partial melting, Pseudosection, Monazite-zircon geochronology |
url |
http://www.sciencedirect.com/science/article/pii/S1674987119301318 |
work_keys_str_mv |
AT nilanjanasorcar characterizationofpartialmeltingeventsingarnetcordieritegneissfromthekeralakhondalitebeltindia AT kumarbatukjoshi characterizationofpartialmeltingeventsingarnetcordieritegneissfromthekeralakhondalitebeltindia AT elsonpoliveira characterizationofpartialmeltingeventsingarnetcordieritegneissfromthekeralakhondalitebeltindia AT jktomson characterizationofpartialmeltingeventsingarnetcordieritegneissfromthekeralakhondalitebeltindia AT vnandakumar characterizationofpartialmeltingeventsingarnetcordieritegneissfromthekeralakhondalitebeltindia |
_version_ |
1724802460671803392 |