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| 005 | 20231030042151.0 | ||
| 035 | _a(RuTPU)RU\TPU\network\39763 | ||
| 035 | _aRU\TPU\network\39459 | ||
| 090 | _a668536 | ||
| 100 | _a20221223a2022 k y0engy50 ba | ||
| 101 | 0 | _aeng | |
| 102 | _aNL | ||
| 135 | _adrcn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aA study of iron carbonates and clay minerals for understanding the origin of marine ooidal ironstone deposits _fM. A. Rudmin, S. Banerjee, E. A. Sinkina [et al.] |
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| 203 |
_aText _celectronic |
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| 300 | _aTitle screen | ||
| 320 | _a[References: 77 tit.] | ||
| 330 | _aA detailed study of cement and matrix of ooidal ironstones of the Bakchar deposit (Western Siberia) was carried out to assess the factors influencing ore-forming processes. This research focusses on a debated issue about iron sources for Phanerozoic ooidal ironstone. Siderite, the main cementing mineral in the ironstones, is of two varieties that differ in morphology, chemical and isotopic composition, and types of fluid inclusions. The first variety of siderite occurs either as veinlet or as anhedral cement, consisting of isotopically light carbon and oxygen (δ13C from −39.5 to −29.7‰ and δ18O from −15.2 to −5.1‰). Fluid inclusions show a relatively high homogenization temperature (170-320 °C) and methane in the gas phase, corresponding to methane-bearing hydrothermal fluids. The second variety of siderite occurs as aggregates of small crystals in the ironstone matrix and is relatively enriched in heavier stable carbon and oxygen isotopes (δ13C from −28.1 to −12.2‰ and δ18O from −28.4 to −2.1‰), suggesting its formation on the seafloor under the combined influence of methane flux and seawater. The zone of the ooidal ironstone most proximal to the most intense ore-mineralization, an area of intense diffusion of metals and methane through marine sediments, is marked by the first variety of siderite, with rare authigenic minerals, a low clay content (kaolinite, chlorite, nontronite) and a high Fe content of the smectites. The authigenic mineral associations reflect the transition from methanic (sulfate-methane transition zone) to ferruginous (iron reduction zone) through sulfidic environment. | ||
| 330 | _aThe intermediate zone is dominated by montmorillonite-illite-saponite-nontronite and the second variety of siderite. The distal zone of the ore deposit is relatively unaltered, and is marked by illite-montmorillonite (illite-smectite), with rare second variety of siderite. The ratio of 1 M phyllosilicates (kaolinite) to the main swelling 2 M phyllosilicates in the clay fraction (K/M mineral index) decreases from the proximal zone of the intense iron-mineralization to the distal zone. The trend of clay mineral changes reflects the decreasing alteration of sediment matrix away from the main iron-rich and/or carbonate-bearing fluid influx. This study shows the expected lateral and vertical variation in authigenic minerals associated with marine Phanerozoic ironstone deposits, related to variable flux of metal- and methane-bearing fluids. | ||
| 333 | _aРежим доступа: по договору с организацией-держателем ресурса | ||
| 461 | _tMarine and Petroleum Geology | ||
| 463 |
_tVol. 142 _v[105777, 13 p.] _d2022 |
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| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _asiderite | |
| 610 | 1 | _aclay minerals | |
| 610 | 1 | _aooidal ironstone | |
| 610 | 1 | _acarbon source | |
| 610 | 1 | _airon source | |
| 610 | 1 | _aupper cretaceous and paleogene | |
| 610 | 1 | _awestern siberia | |
| 701 | 1 |
_aRudmin _bM. A. _cgeologist _cAssociate Professor of Tomsk Polytechnic University, Candidate of Geological and Mineralogical Sciences _f1989- _gMaksim Andreevich _2stltpush _3(RuTPU)RU\TPU\pers\33254 |
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| 701 | 1 |
_aBanerjee _bS. _gSantanu |
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| 701 | 1 |
_aSinkina _bE. A. _cgeologist _cAssociate Professor of Tomsk Polytechnic University, Candidate of geological and mineralogical sciences _f1986- _gEkaterina Andreevna _2stltpush _3(RuTPU)RU\TPU\pers\37111 |
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| 701 | 1 |
_aRuban _bA. S. _cgeologist _cengineer of Tomsk Polytechnic University _f1991- _gAleksey Sergeevich _2stltpush _3(RuTPU)RU\TPU\pers\34023 |
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| 701 | 1 |
_aKalinina _bN. A. _cMining engineer _cTechnician of Tomsk Polytechnic University _f1998- _gNatalya Andreevna _2stltpush _3(RuTPU)RU\TPU\pers\47286 |
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| 701 | 1 |
_aSmirnov _bP. V. |
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| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет _bИнженерная школа природных ресурсов _bОтделение геологии _h8083 _2stltpush _3(RuTPU)RU\TPU\col\23542 |
| 801 | 2 |
_aRU _b63413507 _c20221223 _gRCR |
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| 856 | 4 | _uhttps://doi.org/10.1016/j.marpetgeo.2022.105777 | |
| 942 | _cCF | ||