Quantitative geochemical reconstruction of Eocene paleoenvironment in Fushun Basin, northeast China

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Acta Geochimica Pub Date : 2024-02-01 DOI:10.1007/s11631-024-00674-6
Yuanji Li, Pingchang Sun, Qiang Zhang, Junxian Wang
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Abstract

The quantitative estimation of key parameters of paleotemperature and paleoprecipitation is crucial for paleoclimate reconstruction. Geochemical data from modern sediments are highly consistent with climate data, and their relationship can provide an important reference for the quantitative reconstruction of the paleoclimate. In this study, detailed inorganic geochemical analysis was carried out using high-precision sampling of the Paleogene (LFD-1 well) Guchengzi, Jijuntun and Xiloutian Formations in the Fushun Basin located in the mid-latitudes of the Northern Hemisphere. The Eocene Guchengzi Formation (54.51–47.8 Ma) and Jijuntun Formation (47.8–41.2 Ma) in the Fushun Basin were found to have been deposited under a humid climate. The lower (41.2–40.1 Ma) and upper (40.1–37.8 Ma) parts of the Xiloutian Formation were characterized by semiarid and semihumid–semiarid climates, respectively, which is very similar to the paleoclimatic information reflected by organic carbon isotopes. The Eocene Thermal Maximum 2 (ETM2, ~ 53.7 Ma), Early Eocene Climatic Optimum (EECO, ~ 53.1–46.5 Ma, Eocene Thermal Maximum 3 (ETM 3, ~ 52.8 Ma), and Middle Eocene Climatic Optimum (MECO, ~ 40.7–40.1 Ma) events significantly enhanced chemical weathering during these periods. The rapid increase in pCO2 concentration leads to an increase in temperature, precipitation, and surface runoff, exhibiting strong chemical weathering. The mean annual temperature (MATa) and mean annual precipitation (MAPa, MAPb, and MAPc) were estimated using parameters, such as the corrosion index without potassium (CIA-K), CaO/Al2O3, and (Na2O + K2O)/Al2O3. Comparing MAPa, MAPb, and MAPc with the MAP estimated using pollen data, MAPa and MAPb were found to be more sensitive to the climate during high precipitation periods (precipitation > 1000 mm, Guchengzi Formation), and the recovered average precipitation was similar to MAP. In contrast, MAPc was more sensitive to the climate during low precipitation periods (precipitation < 1000 mm, Jijuntun, and Xiloutian Formations), with higher accuracy. To fully consider the influence of soluble inorganic salts Ca2+ and Na+, multivariate linear equations of CIA-K and CaO/Al2O3 with CIA, and CIA-K and CaO/Al2O3 with MAP were constructed, namely MAPd and MAPe. The results show that MAPe has the highest performance and can be effectively used to estimate the change of paleoprecipitation in Northeast Asia.

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中国东北抚顺盆地始新世古环境的定量地球化学重建
古温度和古沉积关键参数的定量估算对于古气候重建至关重要。现代沉积物的地球化学数据与气候数据高度一致,它们之间的关系可以为古气候的定量重建提供重要参考。本研究对位于北半球中纬度地区的抚顺盆地古城子地层、吉屯地层和西楼田地层的古近纪(LFD-1井)沉积物进行了高精度取样,并进行了详细的无机地球化学分析。抚顺盆地的始新世古城子地层(54.51-47.8Ma)和吉军屯地层(47.8-41.2Ma)是在潮湿气候下沉积的。西楼田地层下部(41.2-40.1 Ma)和上部(40.1-37.8 Ma)分别具有半干旱气候和半湿润半干旱气候特征,这与有机碳同位素反映的古气候信息非常相似。在这些时期,始新世热极盛期 2(ETM2,约 53.7 Ma)、早始新世气候最适宜期(EECO,约 53.1-46.5 Ma)、始新世热极盛期 3(ETM3,约 52.8 Ma)和中始新世气候最适宜期(MECO,约 40.7-40.1 Ma)事件显著加剧了化学风化作用。pCO2 浓度的快速增加导致温度、降水和地表径流的增加,表现出强烈的化学风化作用。利用不含钾的腐蚀指数(CIA-K)、CaO/Al2O3 和 (Na2O + K2O)/Al2O3 等参数估算了年平均温度(MATa)和年平均降水量(MAPa、MAPb 和 MAPc)。将 MAPa、MAPb 和 MAPc 与利用花粉数据估算的 MAP 相比较,发现 MAPa 和 MAPb 对高降水期(降水量 > 1000 毫米,古城子地层)的气候更为敏感,恢复的平均降水量与 MAP 相似。相比之下,MAPc 对低降水期(降水量 < 1000 毫米,吉军屯和西楼田地层)的气候更为敏感,精度更高。为充分考虑可溶性无机盐 Ca2+ 和 Na+ 的影响,构建了 CIA-K 和 CaO/Al2O3 与 CIA 的多元线性方程,以及 CIA-K 和 CaO/Al2O3 与 MAP 的多元线性方程,即 MAPd 和 MAPe。结果表明,MAPe 的性能最高,可以有效地用于估算东北亚地区古沉积的变化。
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来源期刊
Acta Geochimica
Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
2.80
自引率
6.20%
发文量
1134
期刊介绍: Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.
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