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Type: Thesis
Title: High-P-T early Palaeoproterozoic metamorphism in southern India
Author: Anderson, J. R.
Issue Date: 2010
School/Discipline: School of Physical Sciences
Abstract: Southern India is comprised of granulite facies metamorphosed crustal blocks, separated by crust penetrating shear zones that have experienced a diverse tectonothermal history from the Archaean to Cambrian. The early Palaeoproterozoic metamorphosed Salem Block in southern India preserves felsic and mafic gneisses ideal for investigating the aerial extent of the preserved Archaean-Palaeoproterozoic southern Indian crust and the metamorphic rock record in the Archaean-Palaeoproterozoic transition. U-Pb zircon, in situ monazite geochronology and zircon REE analysis obtained using Laser-Ablation Inductively-Coupled-Plasma Mass-Spectrometry (LA-ICP-MS), and P-T phase equilibria and average P-T conventional thermobarometry calculated using THERMOCALC from the Kanja Malai Hills, demonstrate that the Salem Block extends south to at least the northern Palghat-Cauvery Shear System. Peak P-T estimates of ~800-850 ºC and 14-16 kbar at ca. 2490 Ma were attained in the southern Salem Block and suggest decompression followed peak metamorphism. The P-T-t constraints in the southern Salem Block are anomalously high pressure compared to other Archaean-Palaeoproterozoic metamorphic events and require thermal regimes that are typically generated in convergent plate margin settings.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2010
Where: Southern India
Keywords: Honours; Geology; southern granulite terrane; Salem Block; metamorphism; LA-ICP-MS; U-Pb geochronology; Palaeoproterozoic
Description: This item is only available electronically.
Provenance: This 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:
Appears in Collections:School of Physical Sciences

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