| 突泉盆地下侏罗统红旗组孢粉组合及其古气候意义 |
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| 关键词:Tuquan Basin well TD-1 Early Jurassic Late Triassic Hongqi Formation sporopollen assemblage |
| 基金项目:本文由东北地区地层古生物地质调查项目(编号: DD20230220)和国家自然科学基金项目(编号: 42293280; 42172024)联合资助。 |
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| Sporopollen Assemblage of the Lower Jurassic Hongqi Formation in the Tuquan Basin and Its Paleoclimatic Significance |
| The Tuquan Basin is a Mesozoic basin overlying the Late Paleozoic basement in the middle section of the Daxing’an Mountains. To explore the stratigraphic development and hydrocarbon geology within the basin, the China Geological Survey implemented “Well TD-1” inside the basin, obtaining complete core physical data for the entire well section, as well as oil showings at the oil spot and immersion levels. However, there remains a lack of definite chronostratigraphic and biostratigraphic evidence for the geological age of the hydrocarbon-bearing horizons in Well TD-1. In this study, the sporopollen in the 879.2–890.7 m well section of Well TD-1 was analyzed, and the Alisporites-Cyclogranisporites-Piceaepollenites sporopollen assemblage was established. In this assemblage, gymnosperm pollen was dominant, with coniferous pollen being the main component and monosulcate pollen occasionally appearing. Fern spores were second, and no angiosperm pollen was found. Additionally, a number of Late Triassic relict elements are present in the current assemblage. Through analysis of the sporopollen components in this well section, its age was determined to be Early Jurassic, corresponding to the Hongqi Formation. Combined with sporopollen vegetation analysis, the results reflect a warm-temperate humid climate. |
| DONG Xinwei,ZHANG Dejun,YANG Tao,SHANG Yuliang,ZHANG Yujin.2026.Sporopollen Assemblage of the Lower Jurassic Hongqi Formation in the Tuquan Basin and Its Paleoclimatic Significance[J].Acta Geoscientica Sinica,47(3):469-479. |
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