First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology
Direct dating of petroleum systems by hydrocarbon or associated authigenic minerals is crucial for petroleum system analysis and hydrocarbon exploration. The precipitation of authigenic pyrite in petroliferous basins is commonly genetically associated with hydrocarbon generation, migration, accumula...
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/7/606 |
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| author | Shaojie Li Xuan-Ce Wang Chao-Feng Li Keyu Liu Simon A. Wilde Si-Yu Hu Lili Gui Jianliang Liu Luya Wu |
| author_facet | Shaojie Li Xuan-Ce Wang Chao-Feng Li Keyu Liu Simon A. Wilde Si-Yu Hu Lili Gui Jianliang Liu Luya Wu |
| author_sort | Shaojie Li |
| collection | DOAJ |
| description | Direct dating of petroleum systems by hydrocarbon or associated authigenic minerals is crucial for petroleum system analysis and hydrocarbon exploration. The precipitation of authigenic pyrite in petroliferous basins is commonly genetically associated with hydrocarbon generation, migration, accumulation, or destruction. Pyrite rubidium-strontium (Rb-Sr) isotope dilution thermal ionization mass spectrometry (ID-TIMS) is a well-developed technique, and its successful application for high-temperature ore systems suggests that this dating method has the potential to directly date key processes in the low-temperature petroleum systems. Rb-Sr data for pyrites in two Ordovician carbonate rock specimens collected from ~4952 m in the YD-2 well in the Yudong region, northern Tarim Basin (NW China), yield two identical isochron ages within analytical uncertainties: 206 ± 13 (2σ) and 224 ± 28 Ma (2σ). SEM investigations demonstrate that Rb and Sr atoms mainly reside in the crystal lattice of the pyrites due to the absence of fluid and mineral inclusions. The rigorous Rb-Sr isochron relations documented in the samples indicate that such residency can result in sufficient Rb/Sr fractionation and initial Sr isotopic homogenization for geochronology. In addition, the closure temperature (227–320 °C) for the Rb-Sr isotope system in pyrite is higher than the precipitation temperature for pyrite in petroleum-related environments (below 200 °C), suggesting that the Rb-Sr age of pyrite was not overprinted by post-precipitation alteration. Integrating the lead-strontium-sulfur isotopes of the pyrites with burial history analysis, the ages are interpreted as the timing of alteration of the paleo-oil pool by a hydrothermally-triggered thermochemical sulfate reduction process. This study, for the first time, demonstrates that Rb-Sr pyrite geochronology, combined with radiogenic and stable isotopic analyses, can be a useful tool to evaluate the temporal evolution of oil pools. This approach bears great potential for dating of petroleum systems anywhere else in the world. |
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| id | doaj.art-14679524624847d5aea1c97ec32dc692 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T18:40:16Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
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| series | Minerals |
| spelling | doaj.art-14679524624847d5aea1c97ec32dc6922023-11-20T05:52:18ZengMDPI AGMinerals2075-163X2020-07-0110760610.3390/min10070606First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite GeochronologyShaojie Li0Xuan-Ce Wang1Chao-Feng Li2Keyu Liu3Simon A. Wilde4Si-Yu Hu5Lili Gui6Jianliang Liu7Luya Wu8School of Earth Sciences, Yunnan University, Kunming 650500, ChinaSchool of Earth Sciences, Yunnan University, Kunming 650500, ChinaState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Geosciences, China University of Petroleum, Qingdao 266555, ChinaThe Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, AustraliaCSIRO Mineral Resources, Kensington, Western Australia 6151, AustraliaResearch Institute of Petroleum Exploration and development, PetroChina, Beijing 100083, ChinaSchool of Geosciences, China University of Petroleum, Qingdao 266555, ChinaSchool of Geosciences, China University of Petroleum, Qingdao 266555, ChinaDirect dating of petroleum systems by hydrocarbon or associated authigenic minerals is crucial for petroleum system analysis and hydrocarbon exploration. The precipitation of authigenic pyrite in petroliferous basins is commonly genetically associated with hydrocarbon generation, migration, accumulation, or destruction. Pyrite rubidium-strontium (Rb-Sr) isotope dilution thermal ionization mass spectrometry (ID-TIMS) is a well-developed technique, and its successful application for high-temperature ore systems suggests that this dating method has the potential to directly date key processes in the low-temperature petroleum systems. Rb-Sr data for pyrites in two Ordovician carbonate rock specimens collected from ~4952 m in the YD-2 well in the Yudong region, northern Tarim Basin (NW China), yield two identical isochron ages within analytical uncertainties: 206 ± 13 (2σ) and 224 ± 28 Ma (2σ). SEM investigations demonstrate that Rb and Sr atoms mainly reside in the crystal lattice of the pyrites due to the absence of fluid and mineral inclusions. The rigorous Rb-Sr isochron relations documented in the samples indicate that such residency can result in sufficient Rb/Sr fractionation and initial Sr isotopic homogenization for geochronology. In addition, the closure temperature (227–320 °C) for the Rb-Sr isotope system in pyrite is higher than the precipitation temperature for pyrite in petroleum-related environments (below 200 °C), suggesting that the Rb-Sr age of pyrite was not overprinted by post-precipitation alteration. Integrating the lead-strontium-sulfur isotopes of the pyrites with burial history analysis, the ages are interpreted as the timing of alteration of the paleo-oil pool by a hydrothermally-triggered thermochemical sulfate reduction process. This study, for the first time, demonstrates that Rb-Sr pyrite geochronology, combined with radiogenic and stable isotopic analyses, can be a useful tool to evaluate the temporal evolution of oil pools. This approach bears great potential for dating of petroleum systems anywhere else in the world.https://www.mdpi.com/2075-163X/10/7/606Rb-Sr pyrite geochronologypyrite Pb-Sr-S isotopeOrdovician paleo-oil poolKuqa DepressionTarim Basin |
| spellingShingle | Shaojie Li Xuan-Ce Wang Chao-Feng Li Keyu Liu Simon A. Wilde Si-Yu Hu Lili Gui Jianliang Liu Luya Wu First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology Minerals Rb-Sr pyrite geochronology pyrite Pb-Sr-S isotope Ordovician paleo-oil pool Kuqa Depression Tarim Basin |
| title | First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology |
| title_full | First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology |
| title_fullStr | First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology |
| title_full_unstemmed | First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology |
| title_short | First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology |
| title_sort | first direct dating of alteration of paleo oil pools using rubidium strontium pyrite geochronology |
| topic | Rb-Sr pyrite geochronology pyrite Pb-Sr-S isotope Ordovician paleo-oil pool Kuqa Depression Tarim Basin |
| url | https://www.mdpi.com/2075-163X/10/7/606 |
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