El nivell marí a Mallorca durant el darrer interglacial (MIS-5): estat de la qüestió basat en les datacions d’espeleotemes freàtics

[eng] Among the specialized studies on the Quaternary of Mallorca, the knowledge of the sea paleolevels in the western
Mediterranean basin has a significant body of research, developed during the second half of the last century by authors such
as Karl W. Butzer and Joan Cuerda. The classic paleontological and geomorphological record, based on the study of the
island’s fossil beaches, was supplemented from the 70s with a new register that offered great geochronological possibilities:
the study of the phreatic overgrowths on speleothems (POS) of Mallorcan coastal caves. These crystalline precipitates record
the sea level with extraordinary resolution, and are also capable of being accurately dated using radiometric techniques
based on the Uranium series (mainly U/Th). In the following pages, a review of the available knowledge about the sea level
in Mallorca during the last interglacial stage (MIS-5) is made, starting from the classic vision based on the malacological
study of the “raised beaches”, to the data from numerous recently published radiometric datings of phreatic overgrowths on
speleothems. This peculiar register provided by our littoral caves reliably documents that the sea level remained relatively
stable, at an altitude of 2.15 ± 0.75 m, during the time span from 126.6 to 116 ka BP (MIS-5e), which would correspond
to the Eemian (the very late Eutyrrhenian, according to the terminology used by Joan Cuerda); it is also documented a high
sea level (+1 m approx.) between 82 and 80 ka BP (MIS-5a), which would be equivalent to the Neotyrrhenian stage of the
same author.