| 江汉盆地SKD1深钻记录的古新世—始新世极热事件时期的古气候 |
| |
| 关键词:Jiangling depression hyperthermal event carbonate carbon/oxygen isotope |
| 基金项目:国家自然科学基金项目(编号: D41907262; U20A2092; 41502089; 42002106);中国地质调查局地质矿产调查评价专项项目(编号: DD20190606);枣庄学院“青檀学者”人才项目 |
|
| 摘要点击次数: 2426 |
| 全文下载次数: 1600 |
| 摘要: |
| Paleoclimate during the Paleocene–Eocene Extreme Thermal Event Recorded by the Deep Drill Core SKD1 in the Jianghan Basin |
| he Paleocene–Eocene thermal extreme event (PETM, ~56 Ma) was a transient episode of global warming near the Paleocene–Eocene boundary. The study of the climate change and driving mechanism of the Paleocene–Eocene thermal extreme event (PETM) is very important for dealing with the impact of global warming on climate and ecosystem. However, the current PETM records are few and its climate effects are still very controversial. Here, based on the materials of the SKD1 core in the Jianghan Basin, we analyzed the indication significance of the carbonate oxygen isotope (δ18Ocarbonate) in the core and further discussed the paleoclimate in the Jianghan Basin during the PETM, using lake authigenic carbonates and their isotopic compositions, combined with lithology characteristics. The results clearly show a significant increase in precipitation (P) in the Jianghan Basin during the PETM event. Before the PETM event (pre-PETM), the δ18Ocarbonate values were relatively high, and the carbonate minerals are mainly dolomite, with anhydrite being widely distributed, indicating a low mean annual precipitation in the Jianghan Basin. During the PETM event, δ18Ocarbonate values show a large negative excursion and calcite is the main deposit, which indicates a significant increase in precipitation and a relatively humid climate. After the PETM event (post-PETM), the increase in both the δ18Ocarbonate values and the dolomite content, along with the deposition of thick layers of anhydrite, glauberite, and halite indicate that the climate became extremely arid again. As a result of rapid global warming in the future, there may be a significant increase in precipitation in subtropical to mid-latitude regions. |
| TENG Xiao-hua,WANG Chun-lian,SHEN Li-jian,WANG Jiu-yi,YU Xiao-can,LIU Xue.2022.Paleoclimate during the Paleocene–Eocene Extreme Thermal Event Recorded by the Deep Drill Core SKD1 in the Jianghan Basin[J].Acta Geoscientica Sinica,43(1):65-72. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|