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- Title
From pluton intrusion to its exhumation: a case study from Barnard Point Batholith, Livingston Island, South Shetland Archipelago, Antarctica.
- Authors
Georgiev, Stoyan; Balkanska, Eleonora; Velev, Stefan; Metodiev, Stefan; Georgiev, Neven; Guillong, Marcel; Kurylo, Sergiy
- Abstract
Three samples from the main phase of the Barnard Point Batholith of granodiorite from the sea level up to 463 m of Mac Kay Peak -- are analyzed. The U-Pb zircon geochronology reveals magmatic crystallization at 43.89±032 Ma. The Ca-amphibole thermobarometry shows a shallow crustal level emplacement (5-3.5 km and temperatures of 810-750 °C). Two main episodes that correspond to the uplift of the Tangra Mountain and exhumation of the batholith are distinguished using apatite fission-track analysis. The models reveal initial very rapid cooling to ~ 80-90 °C between 40 and 33 Ma and a second episode of uplift and moderate cooling to surface temperatures between 22 and 15 Ma. The obtained positive age-altitude correlation suggests moderate exhumation rate of 340 m/ Ma. The thermal modelling of the hypsometrically lowest sample reveals a later moderate cooling event to surface temperatures from 8 Ma to recent times, which corresponds to the Bransfield Rift initiation.
- Subjects
ANTARCTICA; BATHOLITHS; EXHUMATION; ARCHIPELAGOES; GEOLOGICAL time scales; SURFACE temperature; IGNEOUS intrusions
- Publication
Review of the Bulgarian Geological Society, 2023, Vol 84, Issue 3, p89
- ISSN
0007-3938
- Publication type
Article
- DOI
10.52215/rev.bgs.2023.84.3.89