In Southeastern Bolivia, the field relations, geochemical and isotopic data collected in the Manomó area, along with the occurrence of apatite-rich lenses, carbonate blocks and the extensive enrichment in U, Th and REE probably point to a complex history: 1. An old BIF-like formation with E-W orientation, formed and metamorphosed during Mesoproterozoic times, cuts an older compressive structure at the border of the Amazonic craton; 2. Probable intrusion and fenitization by carbonatitic magma in (Early, Late?) Cretaceous times; 3. Lateritization processes and formation of a thick duricrust in Tertiary-Quaternary times. A more detailed field sampling, as well as additional systematic and extensive geological, mineralogical, petrographic and geochemical studies are required to obtain a more accurate regional picture.
Iron-rich formations at the Cerro Manomó region, Southeastern Bolivia: remnant of a BIF?
DE MIN, ANGELO;
2011-01-01
Abstract
In Southeastern Bolivia, the field relations, geochemical and isotopic data collected in the Manomó area, along with the occurrence of apatite-rich lenses, carbonate blocks and the extensive enrichment in U, Th and REE probably point to a complex history: 1. An old BIF-like formation with E-W orientation, formed and metamorphosed during Mesoproterozoic times, cuts an older compressive structure at the border of the Amazonic craton; 2. Probable intrusion and fenitization by carbonatitic magma in (Early, Late?) Cretaceous times; 3. Lateritization processes and formation of a thick duricrust in Tertiary-Quaternary times. A more detailed field sampling, as well as additional systematic and extensive geological, mineralogical, petrographic and geochemical studies are required to obtain a more accurate regional picture.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
