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dc.contributor.authorMansfield, W. H.-
dc.coverage.spatialMercara Shear Zone, Coorg Block, India-
dc.descriptionThis item is only available electronically.en
dc.description.abstractHigh pressure granulite metamorphism has never been recorded during the Mesoarchaean. The Mercara shear zone in the Coorg Block, south west India plays host to kyanite-sillimanite-garnet-bearing felsic granulites that equilibrated at 11-13 kbar and 860 °C and 7.5-9 Kbar at 850-860 °C. LA-ICP-MS of U-Pb zircon and in-situ monazite geochronology reveal that the assemblages were first metamorphosed at ca. 3071 Ma, then again at ca. 676 ± _47 Ma. Pressure-temperature-time studies from the shear zone had not previously described conditions of this nature before, revealing how timing the suturing of the Coorg block will require extensive sampling methods. The conditions described however provide an insight into the thickened crust and low apparent thermal gradients existing during the stagnant-lid to first tectonism transitionary period, a period that usually only records high apparent thermal gradients and weakened crust. The ancient assemblage preserves regimes typical of contractional orogenic events, implying crustal thicknesses 35-40 km deep. Crustal thickening of this nature provides evidence for modern style tectonics operating during the Mesoarchaean.en
dc.subjectHonours; Geology; U-Pb geochronology; phase equilibria modelling; Archaean high pressure metamorphism; Neoproterozoic metamorphism; Mercara shear zone; Coorg Block; Indiaen
dc.titleAge, provenance and metamorphic conditions of the Mercara Shear Zone, Coorg Block, Indiaen
dc.contributor.schoolSchool of Physical Sciencesen
dc.provenanceThis electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the author of this thesis and do not wish it to be made publicly available, or you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
dc.description.dissertationThesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2016-
Appears in Collections:School of Physical Sciences

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