Abstract
The Jandaira Formation (Turonian/Maastrichtian - Potiguar Basin, Brazil) presents an anomalous radioactive marker in the upper part of its carbonatic section. This marker of 3-20 m in thickness, comprises an area of about 3500 Km{sup 2} and shows a radioactivity of 470 UAPI, against a background of 20 UAPI on the Gamma Ray Log. In the effort of characterizing this marker, petrological, mineralogical, geological and paleontological, analyses were made in ditch samples of selected 23 wells. This marker is composed by bioclastics packstones to mudstones, mainly constituted of planktonic and bentonic forams, deposited in relatively deep water. Chemical analysis of the P 205 richest samples, the ones show that they are also enriched on U, F, As, Cr, Cu, Mo, Ni, Pb, S, Se, V, Y, Yb and on all rare-earth elements. The origin of the radioactive anomaly is due to the presence of sedimentary phosphates (phosphorite) made-up of uraniferous coloform apatite. (author).
Citation Formats
Matsuda, N S.
Petrographic, mineralogical, geochemical and paleo environmental characterization of radioactive anomaly associated to carbonate rocks from Jandaira formation of high cretaceous from Potiguar basin - Rio Grande do Norte - Brazil; Caracterizacao petrografica, mineralogica, geoquimica e paleoambiental da anomalia radioativa associada a rochas carbonaticas da formacao Jandaira do cretaceo superior da bacia Potiguar - Rio Grande do Norte - Brasil.
Brazil: N. p.,
1988.
Web.
Matsuda, N S.
Petrographic, mineralogical, geochemical and paleo environmental characterization of radioactive anomaly associated to carbonate rocks from Jandaira formation of high cretaceous from Potiguar basin - Rio Grande do Norte - Brazil; Caracterizacao petrografica, mineralogica, geoquimica e paleoambiental da anomalia radioativa associada a rochas carbonaticas da formacao Jandaira do cretaceo superior da bacia Potiguar - Rio Grande do Norte - Brasil.
Brazil.
Matsuda, N S.
1988.
"Petrographic, mineralogical, geochemical and paleo environmental characterization of radioactive anomaly associated to carbonate rocks from Jandaira formation of high cretaceous from Potiguar basin - Rio Grande do Norte - Brazil; Caracterizacao petrografica, mineralogica, geoquimica e paleoambiental da anomalia radioativa associada a rochas carbonaticas da formacao Jandaira do cretaceo superior da bacia Potiguar - Rio Grande do Norte - Brasil."
Brazil.
@misc{etde_10108485,
title = {Petrographic, mineralogical, geochemical and paleo environmental characterization of radioactive anomaly associated to carbonate rocks from Jandaira formation of high cretaceous from Potiguar basin - Rio Grande do Norte - Brazil; Caracterizacao petrografica, mineralogica, geoquimica e paleoambiental da anomalia radioativa associada a rochas carbonaticas da formacao Jandaira do cretaceo superior da bacia Potiguar - Rio Grande do Norte - Brasil}
author = {Matsuda, N S}
abstractNote = {The Jandaira Formation (Turonian/Maastrichtian - Potiguar Basin, Brazil) presents an anomalous radioactive marker in the upper part of its carbonatic section. This marker of 3-20 m in thickness, comprises an area of about 3500 Km{sup 2} and shows a radioactivity of 470 UAPI, against a background of 20 UAPI on the Gamma Ray Log. In the effort of characterizing this marker, petrological, mineralogical, geological and paleontological, analyses were made in ditch samples of selected 23 wells. This marker is composed by bioclastics packstones to mudstones, mainly constituted of planktonic and bentonic forams, deposited in relatively deep water. Chemical analysis of the P 205 richest samples, the ones show that they are also enriched on U, F, As, Cr, Cu, Mo, Ni, Pb, S, Se, V, Y, Yb and on all rare-earth elements. The origin of the radioactive anomaly is due to the presence of sedimentary phosphates (phosphorite) made-up of uraniferous coloform apatite. (author).}
place = {Brazil}
year = {1988}
month = {Dec}
}
title = {Petrographic, mineralogical, geochemical and paleo environmental characterization of radioactive anomaly associated to carbonate rocks from Jandaira formation of high cretaceous from Potiguar basin - Rio Grande do Norte - Brazil; Caracterizacao petrografica, mineralogica, geoquimica e paleoambiental da anomalia radioativa associada a rochas carbonaticas da formacao Jandaira do cretaceo superior da bacia Potiguar - Rio Grande do Norte - Brasil}
author = {Matsuda, N S}
abstractNote = {The Jandaira Formation (Turonian/Maastrichtian - Potiguar Basin, Brazil) presents an anomalous radioactive marker in the upper part of its carbonatic section. This marker of 3-20 m in thickness, comprises an area of about 3500 Km{sup 2} and shows a radioactivity of 470 UAPI, against a background of 20 UAPI on the Gamma Ray Log. In the effort of characterizing this marker, petrological, mineralogical, geological and paleontological, analyses were made in ditch samples of selected 23 wells. This marker is composed by bioclastics packstones to mudstones, mainly constituted of planktonic and bentonic forams, deposited in relatively deep water. Chemical analysis of the P 205 richest samples, the ones show that they are also enriched on U, F, As, Cr, Cu, Mo, Ni, Pb, S, Se, V, Y, Yb and on all rare-earth elements. The origin of the radioactive anomaly is due to the presence of sedimentary phosphates (phosphorite) made-up of uraniferous coloform apatite. (author).}
place = {Brazil}
year = {1988}
month = {Dec}
}