The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana

Durgalakshmi; K. Sajeev; Ian S. Williams; D. Harinadha Reddy; M. Satish Kumar; Niels Jons; Sanjeewa P.K. Malaviarachchi; Vinod O. Samuel; P. M. George

doi:10.1093/petrology/egab068

The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana

Durgalakshmi^*, K. Sajeev, Ian S. Williams, D. Harinadha Reddy, M. Satish Kumar, Niels Jons, Sanjeewa P.K. Malaviarachchi, Vinod O. Samuel, P. M. George

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided.

Original language	English
Article number	068
Journal	Journal of Petrology
Volume	62
Issue number	12
DOIs	https://doi.org/10.1093/petrology/egab068
Publication status	Published - 1 Dec 2021

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title = "The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana",

abstract = "Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided.",

keywords = "Eastern Gondwana, Pseudosection modelling, SIMS U Th Pb ages, Sapphirine quartz, ultrahigh-Temperature metamorphism",

author = "Durgalakshmi and K. Sajeev and Williams, {Ian S.} and Reddy, {D. Harinadha} and Kumar, {M. Satish} and Niels Jons and Malaviarachchi, {Sanjeewa P.K.} and Samuel, {Vinod O.} and George, {P. M.}",

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AU - Durgalakshmi,

AU - Sajeev, K.

AU - Williams, Ian S.

AU - Reddy, D. Harinadha

AU - Kumar, M. Satish

AU - Jons, Niels

AU - Malaviarachchi, Sanjeewa P.K.

AU - Samuel, Vinod O.

AU - George, P. M.

PY - 2021/12/1

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N2 - Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided.

AB - Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided.

KW - Eastern Gondwana

KW - Pseudosection modelling

KW - SIMS U Th Pb ages

KW - Sapphirine quartz

KW - ultrahigh-Temperature metamorphism

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U2 - 10.1093/petrology/egab068

DO - 10.1093/petrology/egab068

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SN - 0022-3530

VL - 62

JO - Journal of Petrology

JF - Journal of Petrology

IS - 12

M1 - 068

ER -

The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana

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