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| Description
| - The Otjosondu ferromanganese deposit is located in a condensed stratigraphic sequence that indicates a basin-margin setting on the northern flank of the Khomas Trough. Association with the Chuos Formation of the Damara Sequence is equivocal as only sediments atypical of this formation are present. Three rock types, hematitic itabirite, braunite-rich gondite and coticule (spessartine–quartz rock), dominate the succession. Barite is a major component of some gonditic ores, whereas barite and hyalophane form important minor constituents of all rock types. Two broad metal associations are present in the ferromanganese rocks (gondite and coticule): Mn–Fe–Ag–As–P–Cu–Co–Bi–B and Ba–Sr–Mo–W–Ni. The three rock types, gondite, coticule and itabirite, represent variable mixtures of hydrothermal and detrital components. Values of barite δ34S are inversely correlated with whole-rock Fe contents and indicate mixing of hydrothermal and sea-water S sources. Cerium anomalies implicate oxic oceanic conditions during deposition of the ferromanganese formations. The Otjosondu ferromanganese deposit is comparable to distal oxidised sediment-hosted exhalative deposits. It may loosely be related to the Rosh Pinah and Tsongoari deposits that occur in roughly similar stratigraphic positions towards the base of the Damara Sequence. The highly oxidised, sulfate-rich nature of the Otjosondu deposit, as opposed to the deep-water, anoxic, sulfate-poor conditions required for the development of glacially associated iron and manganese formations, argues against an association with a snowball-Earth episode.
- The Otjosondu ferromanganese deposit is located in a condensed stratigraphic sequence that indicates a basin-margin setting on the northern flank of the Khomas Trough. Association with the Chuos Formation of the Damara Sequence is equivocal as only sediments atypical of this formation are present. Three rock types, hematitic itabirite, braunite-rich gondite and coticule (spessartine–quartz rock), dominate the succession. Barite is a major component of some gonditic ores, whereas barite and hyalophane form important minor constituents of all rock types. Two broad metal associations are present in the ferromanganese rocks (gondite and coticule): Mn–Fe–Ag–As–P–Cu–Co–Bi–B and Ba–Sr–Mo–W–Ni. The three rock types, gondite, coticule and itabirite, represent variable mixtures of hydrothermal and detrital components. Values of barite δ34S are inversely correlated with whole-rock Fe contents and indicate mixing of hydrothermal and sea-water S sources. Cerium anomalies implicate oxic oceanic conditions during deposition of the ferromanganese formations. The Otjosondu ferromanganese deposit is comparable to distal oxidised sediment-hosted exhalative deposits. It may loosely be related to the Rosh Pinah and Tsongoari deposits that occur in roughly similar stratigraphic positions towards the base of the Damara Sequence. The highly oxidised, sulfate-rich nature of the Otjosondu deposit, as opposed to the deep-water, anoxic, sulfate-poor conditions required for the development of glacially associated iron and manganese formations, argues against an association with a snowball-Earth episode. (en)
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| Title
| - GEOCHEMICAL AND MINERALOGICAL CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS HYDROGENETIC (INCLUDING SNOWBALL-EARTH) ORIGINS
- GEOCHEMICAL AND MINERALOGICAL CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS HYDROGENETIC (INCLUDING SNOWBALL-EARTH) ORIGINS (en)
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| skos:prefLabel
| - GEOCHEMICAL AND MINERALOGICAL CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS HYDROGENETIC (INCLUDING SNOWBALL-EARTH) ORIGINS
- GEOCHEMICAL AND MINERALOGICAL CONSTRAINTS ON THE GENESIS OF THE OTJOSONDU FERROMANGANESE DEPOSIT, NAMIBIA: HYDROTHERMAL EXHALATIVE VERSUS HYDROGENETIC (INCLUDING SNOWBALL-EARTH) ORIGINS (en)
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| skos:notation
| - RIV/00025798:_____/11:00000540!RIV12-MZP-00025798
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| http://linked.open...avai/predkladatel
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/00025798:_____/11:00000540
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - ferromanganese deposit, hematitic iron formation, trace element associations of Ag–As–Cu–Co–Bi–B–P–REE with Mn and Sr–Mo–W with Ba, hyalophane, spessartine, barite (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - ZA - Jihoafrická republika
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - South African Journal of Geology
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - CABRAL, A.
- Koubová, Magdaléna
- MAPANI, B.
- MOORE, J.
- SATTLER, C.-
|
| http://linked.open...n/vavai/riv/zamer
| |
| issn
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| number of pages
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| http://bibframe.org/vocab/doi
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| is http://linked.open...avai/riv/vysledek
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