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| 001 | 658829 | ||
| 005 | 20231030041608.0 | ||
| 035 | _a(RuTPU)RU\TPU\network\26953 | ||
| 090 | _a658829 | ||
| 100 | _a20181129a2019 k y0engy50 ba | ||
| 101 | 0 | _aeng | |
| 102 | _aNL | ||
| 135 | _adrcn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aOrigin of ooidal ironstones in relation to warming events: Cretaceous-Eocene Bakchar deposit, south-east Western Siberia _fM. A. Rudmin, A. K. Mazurov, S. Banerjee |
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| 203 |
_aText _celectronic |
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| 300 | _aTitle screen | ||
| 320 | _a[References: 109 tit.] | ||
| 330 | _aAn integrated study involving petrographical, mineralogical and geochemical investigations proposes the origin of the Bakchar ironstone deposit by upward migration of a mixture of Fe-rich brine and hydrothermal fluid through marine sediments. Trace element concentrations of the ironstone deposits rule out continental derivation of Fe, while high REE concentrations indicate mixed hydrogeneous and hydrothermal source. Three main types of ironstone within the Bakchar deposit are characterized by distinct mineralogical assemblage of authigenic minerals corresponding to oxic, methanic and weakly sulfidic dysoxic conditions. Changing redox conditions of the depositional environment, methane seepage in warm seawater and availability of iron influx possibly determined the final mineralogy of three varieties of ironstones. The association of siderite with ferrimagnetic sulfides like greigite and pyrrhotite in type-1 ore indicate anaerobic oxidation of methane with limited bacterial sulfate reduction. The ironstone deposits of Narym, Kolpashevo and Bakchar are contemporaneous with geological events like ocean anoxic event 3 (OAE-3), Cretaceous-Paleogene (K-Pg) boundary and Palaeocene-Eocene Thermal Maximum (PETM), respectively, all corresponding to warm seawater conditions. | ||
| 333 | _aРежим доступа: по договору с организацией-держателем ресурса | ||
| 461 | _tMarine and Petroleum Geology | ||
| 463 |
_tVol. 100 _v[P. 309-325] _d2019 |
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| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _aБакчар | |
| 610 | 1 | _aгеохимия | |
| 610 | 1 | _aминералогия | |
| 610 | 1 | _aЗападная Сибирь | |
| 701 | 1 |
_aRudmin _bM. A. _cgeologist _cEngineer-researcher of Tomsk Polytechnic University _f1989- _gMaksim Andreevich _2stltpush _3(RuTPU)RU\TPU\pers\33254 |
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| 701 | 1 |
_aMazurov _bA. K. _cDoctor of Geological and Mineralogical Sciences _cProfessor of Tomsk Polytechnic University (TPU) _f1951- _gAleksey Karpovich _2stltpush _3(RuTPU)RU\TPU\pers\30165 |
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| 701 | 1 |
_aBanerjee _bS. _gSantanu |
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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 _c20210412 _gRCR |
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| 856 | 4 | _uhttps://doi.org/10.1016/j.marpetgeo.2018.11.023 | |
| 942 | _cCF | ||