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...

Full description

Bibliographic Details
Main Authors: Nilanjana Sorcar, Kumar Batuk Joshi, Elson P. Oliveira, J.K. Tomson, V. Nandakumar
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