| 温室背景下陆相抚顺盆地始新世西露天组古气候演化 |
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| 引用本文：白悦悦,王灼,孙平昌,李元吉.2022.温室背景下陆相抚顺盆地始新世西露天组古气候演化[J].地球学报,43(6):917-924. |
| DOI：10.3975/cagsb.2022.101901 |
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| 基金项目:中国地质调查局地质调查二级项目(编号: DD20221643);中国地质科学院基本科研业务费项目(编号: JKY202012; YWFBC201801) |
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| 中文摘要:古近纪古新世—始新世极热事件和始新世后期变冷的古气候事件是目前沉积学和古气候学研究的热点, 但相关研究在陆相地层中较少涉及。前人对抚顺盆地始新世一系列极热事件进行了识别和成因研究, 但针对始新世后期开始变冷的古气候波动状况尚未进行系统分析。本文采用了古气候参数磁化率和色度对抚顺盆地始新世西露天组(晚始新世)古气候的波动和演化特征进行研究。通过对高精度磁化率和色度数据进行聚类分析和垂向演化规律对比发现, 西露天组沉积记录具有高的频率磁化率(12.58%~39.63%)、中高色度a*值(5.6%左右)和中高色度b*值(9.1%左右), 且这些数值均与古气温具有很好的对应性, 鉴于此, 这两种参数可以作为始新世陆相古气候演化研究的有效手段。抚顺盆地西露天组自底部到顶部, 频率磁化率呈由高值到低值缓慢下降的趋势, 色度a*值和b*值总体呈现先增加后减少的趋势, 这些均显示了抚顺盆地始新世整体温室气候背景下的降温过程。本次对晚始新世古气候变化趋势研究的认识, 联合前人在早始新世古气候演化的研究成果, 可以共同为东亚地区完整的始新世古气候演化研究提供可靠素材。 |
| 中文关键词:抚顺盆地 西露天组 热事件 始新世古气候 |
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| Paleoclimate Evolution of the Eocene Xiloutian Formation in the Continental Fushun Basin in the Warm House Background |
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| Abstract:Paleogene Palaeocene to Early and Middle Eocene Extreme Hot events and Late Eocene Cooling paleoclimate events are current research hotspots in the fields of sedimentology and paleoclimatology, but there are few studies about it in continental strata. Most research on the Paleogene hyperthermal events were mainly conducted in the marine strata. Predecessors have identified and studied the origins of the Eocene Extreme Hot events in Fushun Basin, but the fluctuations about the late Eocene cooling-trend paleoclimate have not been systematically analyzed. In this study, we first carried out the paleoclimate parameters of magnetic susceptibility and chromaticity data to study the fluctuations and evolution of the paleoclimate of the Eocene Xiloutian Formation (Late Eocene) in the Fushun Basin. Through cluster analysis and vertical evolution comparison of high-precision magnetic susceptibility and chromaticity data, it was found that the sedimentary records of the Xiloutian Formation have high-frequency magnetic susceptibility (12.58%–39.63%), medium-high chromaticity a* value (5.6%) and medium-high chromaticity b* value (9.1%), and these values have good correspondence with paleo-temperature. Given this, these two parameters can be used as effective means to study the evolution of the continental Eocene paleoclimate. From bottom to top in the Eocene Xiloutian Formation of the Fushun Basin, the frequency magnetic susceptibility shows a slow downward trend from high value to low value, and the chroma a* value and b* value generally both show first a increasing and then a decreasing trend. These all show the cooling process in the late Eocene Fushun Basin. This research understanding of the late Eocene paleoclimate evolution, combined with previous research results about the early Eocene paleoclimate evolution, can jointly provide reliable materials for the Eocene complete paleoclimate evolution in East Asia. |
| keywords:Fushun Basin Xiloutian Formation Extreme Hot events Eocene paleoclimate |
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