Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3
In depth of the Simao Basin (2390 to 2650 m depth interval), many gray mudstone or carbonate rocks are developed in the red salt-related strata, and pyrite crystals are found in the fissure and matrix. In this study, petrology, mineralogy, element geochemistry, and LA-MC-ICP-MS in situ sulfur isotop...
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MDPI AG
2023-07-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/7/949 |
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| author | Zhongying Miao Mianping Zheng Pengcheng Lou Qihui Xu Yuanying Liu |
| author_facet | Zhongying Miao Mianping Zheng Pengcheng Lou Qihui Xu Yuanying Liu |
| author_sort | Zhongying Miao |
| collection | DOAJ |
| description | In depth of the Simao Basin (2390 to 2650 m depth interval), many gray mudstone or carbonate rocks are developed in the red salt-related strata, and pyrite crystals are found in the fissure and matrix. In this study, petrology, mineralogy, element geochemistry, and LA-MC-ICP-MS in situ sulfur isotope analysis were used to constrain the genesis of pyrite, and the influence of relevant geological activities on potash mineralization was discussed. The results show that: (1) In the upper part of the salt layer, particle size of the pyrite ranges from 50 to 300 μm. The crystal morphology is mainly pentagonal-dodecahedral and irregularly granular, with a small amount of cuboidal pyrite. In the interlayer between rock salt, particle size of the pyrite is from 50 to 100 μm, and the crystals are mainly octahedral. (2) The S/Fe value of pentagonal-dodecahedral pyrite is significantly greater than 2; the S/Fe value of octahedral and cubic pyrite is less than 2; and the S/Fe value of irregular granular pyrite is close to 2. (3) The δ<sup>34</sup>S<sub>V-CDT</sub> values of pyrite in the upper salt-related strata range from −15.65‰ to 11.81‰, and the average δ<sup>34</sup>S<sub>V-CDT</sub> values of all samples range from 0.79‰ to 8.20‰. The δ<sup>34</sup>S<sub>V-CDT</sub> values of pyrite interlayer between rock salt range from −15.02‰ to −6.36‰, with an average value of −10.66‰. The above results indicate that the pyrite in the upper part of the rock salt layer was formed in a medium-low temperature hydrothermal environment, and the ore-forming sulfur elements have hydrothermal sources, bacterial sulfate reduction (BSR) sources, and thermochemical sulfate reduction (TSR) contributions. The pyrite between the rock salt layers is of sedimentary origin, and the ore-forming sulfur element comes from BSR. At present, there is no evidence of the influence of hydrothermal activities on deep potash-rich salt bodies, and the influence on the Mengyejing potash deposit has continued since the metallogenic period. |
| first_indexed | 2024-03-11T00:48:24Z |
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| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
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| spelling | doaj.art-e7cfde724239496ab271688c231d4a5e2023-11-18T20:39:18ZengMDPI AGMinerals2075-163X2023-07-0113794910.3390/min13070949Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3Zhongying Miao0Mianping Zheng1Pengcheng Lou2Qihui Xu3Yuanying Liu4MNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaMNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaMNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaSchool of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, ChinaIn depth of the Simao Basin (2390 to 2650 m depth interval), many gray mudstone or carbonate rocks are developed in the red salt-related strata, and pyrite crystals are found in the fissure and matrix. In this study, petrology, mineralogy, element geochemistry, and LA-MC-ICP-MS in situ sulfur isotope analysis were used to constrain the genesis of pyrite, and the influence of relevant geological activities on potash mineralization was discussed. The results show that: (1) In the upper part of the salt layer, particle size of the pyrite ranges from 50 to 300 μm. The crystal morphology is mainly pentagonal-dodecahedral and irregularly granular, with a small amount of cuboidal pyrite. In the interlayer between rock salt, particle size of the pyrite is from 50 to 100 μm, and the crystals are mainly octahedral. (2) The S/Fe value of pentagonal-dodecahedral pyrite is significantly greater than 2; the S/Fe value of octahedral and cubic pyrite is less than 2; and the S/Fe value of irregular granular pyrite is close to 2. (3) The δ<sup>34</sup>S<sub>V-CDT</sub> values of pyrite in the upper salt-related strata range from −15.65‰ to 11.81‰, and the average δ<sup>34</sup>S<sub>V-CDT</sub> values of all samples range from 0.79‰ to 8.20‰. The δ<sup>34</sup>S<sub>V-CDT</sub> values of pyrite interlayer between rock salt range from −15.02‰ to −6.36‰, with an average value of −10.66‰. The above results indicate that the pyrite in the upper part of the rock salt layer was formed in a medium-low temperature hydrothermal environment, and the ore-forming sulfur elements have hydrothermal sources, bacterial sulfate reduction (BSR) sources, and thermochemical sulfate reduction (TSR) contributions. The pyrite between the rock salt layers is of sedimentary origin, and the ore-forming sulfur element comes from BSR. At present, there is no evidence of the influence of hydrothermal activities on deep potash-rich salt bodies, and the influence on the Mengyejing potash deposit has continued since the metallogenic period.https://www.mdpi.com/2075-163X/13/7/949Simao Basinpotashpyritesulfur isotopein situ analysishydrothermal activity |
| spellingShingle | Zhongying Miao Mianping Zheng Pengcheng Lou Qihui Xu Yuanying Liu Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 Minerals Simao Basin potash pyrite sulfur isotope in situ analysis hydrothermal activity |
| title | Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 |
| title_full | Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 |
| title_fullStr | Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 |
| title_full_unstemmed | Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 |
| title_short | Genesis of Pyrite in Clastic Rocks of Deep Salt-Related Strata in the Simao Basin and Its Implication for Potash Mineralization: A Case Study of the Well MK-3 |
| title_sort | genesis of pyrite in clastic rocks of deep salt related strata in the simao basin and its implication for potash mineralization a case study of the well mk 3 |
| topic | Simao Basin potash pyrite sulfur isotope in situ analysis hydrothermal activity |
| url | https://www.mdpi.com/2075-163X/13/7/949 |
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