Geochemical and palaeomagnetic characteristics of the Vestfold Hills mafic dykes in the Prydz Bay region: implications of a Paleoproterozoic connection between East Antarctica and Proto-India
Geological Society, London, Special Publications
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Abstract
The Archean age granite gneiss basement along the Prydz Bay coastline in East Antarctica hosts north–south-, east–west-, NE–SW- and NW–SE-trending mafic dyke swarms in the Vestfold Hills region that intruded between 2420 and 1250 Ma. The dyke trends do not show a direct correlation with the dyke geochemistry but can be broadly discriminated into high-Mg and Fe-rich tholeiites. The former type are more siliceous, are enriched in large ion lithophile elements (LILEs), high field strength elements (HFSEs) and light REEs (LREEs), and crystallized from a fractionated melt with a notable crustal component or fluid enrichment
through the previous subduction process. The Fe-rich tholeiites are less siliceous, have lower abundances of LILEs and REEs, and were derived from an undifferentiated, primitive melt. The geochemical characteristics of both types underline a shallow level and a high degree of melting in the majority of cases, and a broadly island arc basalt (IAB) affinity. Palaeomagnetic analysis of hand samples shows directional groups consistent with geochemical groupings. The Vestfold Hills dykes show a possible linkage with the coeval mafic dykes in the Eastern Dharwar and Bastar cratons of the South Indian Block, based on the similarity in the Paleoproterozoic palaeolatitudes
Suggested Citation
Pandit, M.K., Pivarunas, A.F., Meert, J.G., 2022, Geochemical and palaeomagnetic characteristics of the Vestfold Hills mafic dykes in the Prydz Bay region: implications of a Paleoproterozoic connection between East Antarctica and Proto-India: Geological Society, London, Special Publications, v. 518, p. 149-171, https://doi.org/10.1144/SP518-2021-33.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geochemical and palaeomagnetic characteristics of the Vestfold Hills mafic dykes in the Prydz Bay region: implications of a Paleoproterozoic connection between East Antarctica and Proto-India |
| Series title | Geological Society, London, Special Publications |
| DOI | 10.1144/SP518-2021-33 |
| Volume | 518 |
| Publication Date | October 28, 2021 |
| Year Published | 2022 |
| Language | English |
| Publisher | The Geological Society of London |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | 23 p. |
| First page | 149 |
| Last page | 171 |