| 莱阳盆地Albian阶林家庄—辛格庄组古环境演变沉积地球化学记录 |
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| 关键词:Jiaolai Basin Cretaceous Albian stage Linjiazhuang–Xingezhuang Formations paleoenvironment |
| 基金项目:山东省地勘项目“胶莱盆地中部白垩纪古生物化石调查研究及保护”(编号: 鲁勘字(2019)54号) |
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| 摘要点击次数: 1967 |
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| 摘要: |
| Sediment and Geochemical Records of Paleoenvironmental Change during Linjiazhuang and Xingezhuang Formations at Albian Stage in the Laiyang Depression |
| Jiaolai Basin is a Cretaceous terrestrial sediment basin with complete strata from the early to late period and includes magmatites among the sediment layers. Lots of dinosaur bone fossils and egg fossils, and even other animal bone and plant fossils were buried in the Cretaceous sediment layers. It is a key region to research the terrestrial paleoenvironmental change during the Cretaceous period. In this study, we surveyed the PM301 section of Linjiazhuang and Xingezhuang Formations in the Laiyang depression, which belongs to the Jiaolai Basin at Albian Stage in the field. Carbon and oxygen isotopes of carbonates (δ13C, δ18O), chromaticness (L*, a*, b*), carbonate content, TOC, and chemical index of alteration (CIA), paleoclimate index (C) had been done for the sediment samples collected from these two Formations. Based on these geochemical proxies, paleoclimate was reconstructed from the cold and dry early Albian Stage to semi-dry and semi-wet gradually, but on the whole, paleoclimate at Albian Stage was warm and wet with several climate oscillation. From the PM301 section, we can find that the heavier carbon isotope at Albian stage had a high correlation with ocean OAEs events, indicating a similarity between the terrestrial and ocean sediment environments. High atmospheric CO2 from volcano emissions may be a linkage between the terrestrial and ocean teleconnection. Based on the heavier carbon isotope excursion, OAE 1c can be divided into at least three sub-cycle stages, and it is inferred that the paleoclimate at Albian stage was unstable and complex. |
| TAO You-bing,REN Tian-long,HUNAG Yong-bo,WANG Li-juan,YAO Jin-jiao,ZHANG Cheng-jun.2022.Sediment and Geochemical Records of Paleoenvironmental Change during Linjiazhuang and Xingezhuang Formations at Albian Stage in the Laiyang Depression[J].Acta Geoscientica Sinica,43(1):38-48. |
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