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We report on the chemo-dynamical analysis of SPLUS J142445.34-254247.1, anextremely metal-poor halo star enhanced in elements formed by the rapidneutron-capture process. This star was first selected as a metal-poor candidatefrom its narrow-band S-PLUS photometry and followed up spectroscopically inmedium-resolution with Gemini South/GMOS, which confirmed its low-metallicitystatus. High-resolution spectroscopy was gathered with GHOST at Gemini South,allowing for the determination of chemical abundances for 36 elements, fromcarbon to thorium. At [Fe/H]=-3.39, SPLUS J1424-2542 is one of the lowestmetallicity stars with measured Th and has the highest logeps(Th/Eu) observedto date, making it part of the "actinide-boost" category of r-process enhancedstars. The analysis presented here suggests that the gas cloud from which SPLUSJ1424-2542 was formed must have been enriched by at least two progenitorpopulations. The light-element (Z<=30) abundance pattern is consistent with theyields from a supernova explosion of metal-free stars with 11.3-13.4 Msun, andthe heavy-element (Z>=38) abundance pattern can be reproduced by the yieldsfrom a neutron star merger (1.66Msun and 1.27Msun) event. A kinematicalanalysis also reveals that SPLUS J1424-2542 is a low-mass, old halo star with alikely in-situ origin, not associated with any known early merger events in theMilky Way.

SPLUS J142445.34-254247.1: An R-Process Enhanced, Actinide-Boost, Extremely Metal-Poor star observed with GHOST