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Type: Journal article
Title: Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system
Author: Collins, A.
Clark, C.
Sajeev, K.
Santosh, M.
Kelsey, D.
Hand, M.
Citation: Terra Nova, 2007; 19(2):141-147
Publisher: Blackwell Science Ltd
Issue Date: 2007
ISSN: 0954-4879
Statement of
Alan S. Collins, Chris Clark, K. Sajeev, M. Santosh, David E. Kelsey, Martin Hand
Abstract: 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.
Description: The definitive version is available at
RMID: 0020070433
DOI: 10.1111/j.1365-3121.2007.00729.x
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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