早期三叠纪的地球年代学基于贝叶斯石爆发年龄和贝叶斯年龄深度模型的结合
Xu Dai1,2,3, Maria Ovtcharova4, Joshua H F L Davies5
1State Key Laboratory of Geomicrobiology and Environmental Changes, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
概括
这项研究通过使用子U-Pb约会和贝叶斯建模来完善早期三叠纪地质年代学. 新时代的估计提高了我们对地球的理解.
科学领域:
- 地质时间学 (Geochronology)
- 古气候学 古气候学
- 古生物学的古生物学
背景情况:
- 在米-米大灭绝之后的三叠纪早期,对于理解生物和环境变化至关重要.
- 这一时期的精确地质年代是有限的和高度辩论,阻碍了详细的重建.
- 现有的年龄模型缺乏与生物反应相关的快速环境事件所需的精度.
研究的目的:
- 建立一个高精度的地质年代框架,用于纪早期使用新的石U-Pb日期.
- 重新评估和完善多个中国南部地区现有的年龄深度模型.
- 校准早期三亚纪碳同位素记录,评估环境和生物变化的节奏.
主要方法:
- 在中国南方的印第安阶段的四个灰中,高精度的子U-Pb测年.
- 结合贝叶斯喷发年龄和贝叶斯年龄深度建模来估计年龄并构建新的模型.
- 整合新时代模型与生物层级图形数据和碳同位素记录.
主要成果:
- 新的年龄估计为关键的早期三叠纪边界,包括珀米亚-三叠纪 (约251.867万年前) 和印第安-奥伦尼克 (约250.626万年前).
- 完善了中国南方五个区域的年龄深度模型,提高了时间分辨率.
- 证明碳同位素外流的速度非常变化,珀米亚-三叠纪边界外流的速度明显比其他更快.
结论:
- 精细的地质时代学框架为早期三叠纪提供了强大的时间基线.
- 这项研究强调了快速的环境变化,由可变的碳同位素外出率证明,灭绝后.
- 这种改进的约会增强了我们评估二叠纪-三叠纪大灭绝后生物恢复和进化的节奏的能力.
相关概念视频
Speciation Rates
22.6K
Overview
22.6K
The Fossil Record
27.0K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
27.0K
Radioactive Decay and Radiometric Dating
36.8K
Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
36.8K
What is Evolutionary History?
42.9K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
42.9K
Conditions on Early Earth
100.4K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
100.4K
Isothermal Processes
4.8K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
4.8K


