Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China
The Guanwushan Formation (GWSF) of Devonian dolomite are extensively developed in the northwest of Sichuan Basin in the Upper Yangtze region, but the properties of dolomitization fluid and the geneses are still unclear. Three types of dolomites can be divided by petrological characteristics: the fin...
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MDPI AG
2022-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/3/317 |
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| author | Shuguang Huang Mingcai Hou Anqing Chen Shenglin Xu Benjian Zhang Yuwei Deng Yu Yu |
| author_facet | Shuguang Huang Mingcai Hou Anqing Chen Shenglin Xu Benjian Zhang Yuwei Deng Yu Yu |
| author_sort | Shuguang Huang |
| collection | DOAJ |
| description | The Guanwushan Formation (GWSF) of Devonian dolomite are extensively developed in the northwest of Sichuan Basin in the Upper Yangtze region, but the properties of dolomitization fluid and the geneses are still unclear. Three types of dolomites can be divided by petrological characteristics: the fine-microcrystalline dolomites (FMD), the fine crystalline dolomites (FCD) and the medium crystalline dolomites (MCD). The order degree of these three types of dolomites increased in turn, and they all showed dark cathodoluminescence (CL) luminescence. The total amount of Rare Earth Elements (∑REE) of the dolomite was low, while the dolomite enriched with light REE and lacking heavy REE presented a distribution pattern consistent with that of limestone. The weak negative anomalies of the Ce and Eu indicated that the dolomites were formed in a weak redox environment with relatively low temperature. The dolomitization fluids were inherited from the original seawater. The respective δ<sup>13</sup>C<sub>PDB</sub> values of the three types of dolomites varied a little, indicating that they were not affected by the biological effects. Specifically, the δ<sup>18</sup>O<sub>PDB</sub> values of the FMD and FCD dolomites were higher than that of the limestone, indicating that the dolomitization fluid was influenced by evaporation at the penecontemporaneous stage. The interpretations were also supported by the <sup>87</sup>Sr/<sup>86</sup>Sr ratios, as the <sup>87</sup>Sr/<sup>86</sup>Sr ratios of FMD comparable to the Middle Devonian seawater. The δ<sup>18</sup>O<sub>PDB</sub> value of the MCD dolomite was lower than that of the limestone. It also showed poor automorphic extent, which clarified that the dolomite experienced more intense dolomitization in greater burial depth and at higher temperatures. |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T13:13:54Z |
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| spelling | doaj.art-6ffbc6d7cf8a4877a41e8a52403f4e5f2023-11-30T21:38:26ZengMDPI AGMinerals2075-163X2022-03-0112331710.3390/min12030317Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW ChinaShuguang Huang0Mingcai Hou1Anqing Chen2Shenglin Xu3Benjian Zhang4Yuwei Deng5Yu Yu6State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaExploration and Development Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, ChinaSichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610091, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaThe Guanwushan Formation (GWSF) of Devonian dolomite are extensively developed in the northwest of Sichuan Basin in the Upper Yangtze region, but the properties of dolomitization fluid and the geneses are still unclear. Three types of dolomites can be divided by petrological characteristics: the fine-microcrystalline dolomites (FMD), the fine crystalline dolomites (FCD) and the medium crystalline dolomites (MCD). The order degree of these three types of dolomites increased in turn, and they all showed dark cathodoluminescence (CL) luminescence. The total amount of Rare Earth Elements (∑REE) of the dolomite was low, while the dolomite enriched with light REE and lacking heavy REE presented a distribution pattern consistent with that of limestone. The weak negative anomalies of the Ce and Eu indicated that the dolomites were formed in a weak redox environment with relatively low temperature. The dolomitization fluids were inherited from the original seawater. The respective δ<sup>13</sup>C<sub>PDB</sub> values of the three types of dolomites varied a little, indicating that they were not affected by the biological effects. Specifically, the δ<sup>18</sup>O<sub>PDB</sub> values of the FMD and FCD dolomites were higher than that of the limestone, indicating that the dolomitization fluid was influenced by evaporation at the penecontemporaneous stage. The interpretations were also supported by the <sup>87</sup>Sr/<sup>86</sup>Sr ratios, as the <sup>87</sup>Sr/<sup>86</sup>Sr ratios of FMD comparable to the Middle Devonian seawater. The δ<sup>18</sup>O<sub>PDB</sub> value of the MCD dolomite was lower than that of the limestone. It also showed poor automorphic extent, which clarified that the dolomite experienced more intense dolomitization in greater burial depth and at higher temperatures.https://www.mdpi.com/2075-163X/12/3/317carbonate platformmineralogygeochemistrydolomitization fluid |
| spellingShingle | Shuguang Huang Mingcai Hou Anqing Chen Shenglin Xu Benjian Zhang Yuwei Deng Yu Yu Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China Minerals carbonate platform mineralogy geochemistry dolomitization fluid |
| title | Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China |
| title_full | Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China |
| title_fullStr | Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China |
| title_full_unstemmed | Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China |
| title_short | Fluid Properties and Genesis of Dolomites in the Devonian Guanwushan Formation of Upper Yangtze Platform, SW China |
| title_sort | fluid properties and genesis of dolomites in the devonian guanwushan formation of upper yangtze platform sw china |
| topic | carbonate platform mineralogy geochemistry dolomitization fluid |
| url | https://www.mdpi.com/2075-163X/12/3/317 |
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