Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system

The Mozambique Ocean closed as Gondwana formed. Its suture has been identified in Madagascar (Betsimisaraka suture), but its continuation, into India, is controversial. The Palghat‐Cauvery shear system appears an ideal candidate as it: (i) lies along strike of the Betsimisaraka suture in Gondwana; (...

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Published in:Terra nova (Oxford, England) England), 2007-04, Vol.19 (2), p.141-147
Main Authors: Collins, Alan S., Clark, Chris, Sajeev, K., Santosh, M., Kelsey, David E., Hand, Martin
Format: Article
Language:English
Subjects:
Geological time
Metamorphic rocks
Oceans
Plate tectonics
Pressure
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cited_by cdi_FETCH-LOGICAL-a4669-e90317d7bf2e74b5997a76e87dd48b83c0ebca6dff1575a8955c87951a8868713
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creator Collins, Alan S.
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description The Mozambique Ocean closed as Gondwana formed. Its suture has been identified in Madagascar (Betsimisaraka suture), but its continuation, into India, is controversial. The Palghat‐Cauvery shear system appears an ideal candidate as it: (i) lies along strike of the Betsimisaraka suture in Gondwana; (ii) forms a high‐pressure granulite belt; and (iii) separates crustal domains with different geological histories. However, existing age constraints have been used to suggest that the structure is Archaean/Palaeoproterozoic. Here we date metamorphic zircons using secondary ion mass spectrometry (535.0 ± 4.9 Ma) and monazites using electron probe micro‐analysis (537 ± 9, 532 ± 8, 525 ± 10 Ma). No evidence for an earlier metamorphic event was found. The identification of Palghat‐Cauvery high‐pressure metamorphism as Cambrian, and recognition that it bounds crustal domains of contrasting origin, points to it being the southern continuation of the Betsimisaraka suture and southern margin of Neoproterozoic India.
doi_str_mv 10.1111/j.1365-3121.2007.00729.x
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subjects Geological time
Metamorphic rocks
Oceans
Plate tectonics
Pressure
title Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system
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