Zircon U–Pb geochronology of manganese-rich rocks from the Borborema Province, Northeast Brazil: adding a new piece to the global inventory of Paleoproterozoic manganese mineralization

The Borborema Province hosts several Mn-rich metasedimentary sequences, containing up to 40 wt% MnO(total). These sequences are composed of Mn oxide and Mn silicate lenses that alternate with spessartite quartzite layers. They are also spatially associated with graphite-bearing gneissic and granitic rocks.