@article{fdi:010084767,
  title = {{P}aragenesis, mineral chemical and microtextural studies of uranium bearing minerals in the brecciated albitites {U}-ores from the {K}itongo shear zone, {P}oli region, northern {C}ameroon},
  author = {{K}ouske, {A}. {P}. and {G}{\'e}rard, {M}artine and {E}tame, {J}. and {K}anouo, {N}. {S}. and {T}chouatcha, {M}. {S}. and {G}hogomu, {T}. {R}. and {C}uney, {M}. and {C}heo, {S}. {E}. and {N}gako, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {K}itongo uranium deposit is located in the northwestern margin of the post-tectonic alkaline batholith of {K}ogue emplaced at ca. 550-530 {M}a. {T}he hydrothermal alteration system that affected the {K}itongo granite is manifested by two albitization events characterized by the development of aegirine-albitites ({N}a-metasomatites). {T}hese albitization events that occurred respectively as pre-ore and ore stages were continuous, spacially bound one another and were accompanied by calcitization ({C}a-metasomatites) and hematitization of various intensity. {T}ectonic breccias that were formed during the reactivation of wrench faults represent the most prevelent {U}-ore morphology types developed along the {K}itongo shear zone ({KSZ}). {T}hese breccias were investigated for their mineral paragenesis, mineral chemical and microtextural features of uranium bearing phases. {T}he results reveal that {U}-ore phases are spherical with a mineral nucleus, massive aggregates or in veinlets with some of these {U}-minerals showing areas of various brightness suggesting a heterogeneous composition of {U}-mineral phases. {R}adiation damage aureoles develop around idiomorphic uraninite crystals as a result of alpha radiations on the enclosing magnetite. {T}he gangue minerals consist of albite, riebeckite, aegirine, amphibole, monazite, magnetite, calcite, zircon, epidote, apatite and titanite. {U}-ore phases are heterogeneous and represent complex {U}-ore mineral assemblage in which both primary and secondary uranium phases were observed. {U}raninite, the primary uranium mineral occurred in the form of isolated euhedral to subhedral grains. {I}t showed low {S}i{O}2, {C}a{O}, {F}e{O}, {P}2{O}5, {Z}r{O}2, {T}h{O}2 and {A}l2{O}3. {T}he low {T}h{O}2 content in this uraninite grains indicated that {U}-primary mineralization formed at a relatively low temperature. {U}raninite grains were progressively converted to coffinite. {T}his progressive conversion was manifested by the occurrence of coffinitised {U}-phase. {C}offinite occurred both as replacement or vein type {U}-phase however with no apparent chemical difference. {T}he other {U}-phases include {U}-{Z}r-{S}i, {U}-{F}e-{S}i and {U}-{T}i. {O}verall, the physical and geochemical characteristics of the {U}-bearing phases in the studied breccias suggest alternating oxidizing and reducing conditions during the formation of uranium ore that occurred during the second albitization phase along the {KSZ}.},
  keywords = {{K}itongo ; {A}lbitization ; {B}reccias ; {U}ranium deposit ; {U}-ore phases ; {CAMEROUN} ; {POLI} {REGION} ; {KITONGO}},
  booktitle = {},
  journal = {{I}nternational {J}ournal of {E}arth {S}ciences},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[24 p.]},
  ISSN = {1437-3254},
  year = {2022},
  DOI = {10.1007/s00531-022-02186-1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084767},
}