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Wiley InterScience | ||
  Terra NovaVolume 19 Issue 2, Pages 141 - 147 Published Online: 14 Mar 2007 © 2010 Blackwell Publishing Ltd
Abstract | References | Full Text: HTML, PDF (Size: 866K) | Related Articles | Citation Tracking  Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system Copyright 2007 Blackwell Publishing Ltd Terra Nova, 19, 141–147, 2007
ABSTRACTThe 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. Received 19 May 2006; revised version accepted 5 December 2006 |
