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Type: Thesis
Title: Metamorphic and geochronological constraints from a proposed continental suture in southern India
Author: Metz, E. A. S.
Issue Date: 2010
School/Discipline: School of Physical Sciences
Abstract: The Palghat-Cauvery Shear System (PCSS) has been proposed as a major suture in the assembly of Gondwana, delineating the site of closure of the Mozambique Ocean. Evidence of an 830 °C and 14 kbar peak metamorphic event has been identified in the Namakkal area, central PCSS. This event is associated with late Mesoproterozoic to early Neoproterozoic Sm-Nd age constraints recorded in the cores of 3000 and 5000 μm diameter garnets. Further P-T constraints, retrieved from structurally-defined younger mineral assemblages associated with partially reset Sm-Nd ages varying between 870.7±3.9 Ma and 683.3±3.0 Ma and moderately prolonged cooling periods of ~30 Myr, indicate that the central PCSS underwent a long-lived period of high-pressure amphibolite facies metamorphism, eventually heating to granulite facies, consistent with the Gondwana-forming suture hypothesis. This evidence supports the model for an early Neoproterozoic protolith metamorphosed during the Pan-African in a collision event for the Palghat-Cauvery Shear System.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2010
Keywords: Honours; Geology; Palghat Cauvery Shear System; South India; Gondwana; Neoproterozoic; Cambrian; Sm-Nd; thermobarometry 
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