Mafic dykes of the East Antarctic shield : experimental, geochemical and petrological studies focusing on the proterozoic evolution of the crust and mantle ...

• Main Author: Kuehner, SM
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Antarctic; Vestfold; Vestfold Hills; Antarc*
• Online Access: https://dx.doi.org/10.25959/23231741.v1; https://figshare.utas.edu.au/articles/thesis/Mafic_dykes_of_the_East_Antarctic_shield_experimental_geochemical_and_petrological_studies_focusing_on_the_proterozoic_evolution_of_the_crust_and_mantle/23231741/1

The Vestfold Hills block of the East Antarctic Shield is an Archean granulite facies complex crossed by hundreds of mafic dykes. The dykes compose five chemically distinct suites emplaced in three separate magmatic episodes during the Early-Middle Proterozoic. Sampling of Chilled margins coupled with detailed documentation of cross-cutting relationships form the basis for studying the chemical and temporal evolution of each dyke suite as well as providing insight into the chemical evolution of the subcontinental mantle during the Proterozoic. Furthermore, the emplacement of the swarms is bracketed by tectonothermal metamorphic events at ca.2500 Ma and ca.1100 Ma. Previous studies of the metamorphic assemblages which developed during these events have provided constraints on the P,T, time path of the Shield. A principal purpose of the present study has been to determine emplacement depths of the dyke suites in order to further restrict the possible uplift path of the shield during the -1400 Ma interval ...