在米-三叠纪超毒性事件期间的光热区域 euxinia
Kliti Grice1, Changqun Cao, Gordon D Love
1Curtin University of Technology, Perth, Australia. K.Grice@curtin.edu.au
Science (New York, N.Y.)
|January 22, 2005
概括
珀米亚-特里亚斯纪的灭绝是由海洋中广泛的eocinic (无毒和硫化) 条件驱动的.
科学领域:
- 古海洋学是古海洋学.
- 地质化学 地质化学
- 生物地质化学生物地质化学
背景情况:
- 珀米亚-特里亚斯纪的边界标志着一个主要的大规模灭绝事件.
- 了解这个时期的环境条件对于解释灭绝的严重程度和恢复至关重要.
- 之前的研究表明无氧条件,但 euxinia 的程度是有争议的.
研究的目的:
- 调查珀斯盆地的古海洋学条件在米-三叠纪超毒事件期间.
- 为了确定 euxinic 条件和硫化物毒性在灭绝和恢复中的作用.
- 为了比较珀斯盆地与其他当代盆地的条件.
主要方法:
- 对碳和硫同位素的分析.
- 生物标志物分析,特别针对Chlorobiaceae的无氧光合作用.
- 铁的物种化分析.
主要成果:
- 在珀斯盆地的古水柱中,在米-三叠纪超毒性事件期间,尤克辛状况普遍存在.
- 生物标志物表明,在克罗罗罗比亚科的边界和早期的三亚纪中,有显著的无氧光合作用.
- 类似的eocinic条件被发现在南中国附近的当代海域.
结论:
- 广泛的光热带 euxinic 条件表明硫化物毒性在推动波斯-三叠纪灭绝中发挥了关键作用.
- 硫化物毒性也导致了灭绝事件后的长期恢复.
- 这些发现突出了海洋无氧和 euxinia 对海洋生态系统的影响.
更多相关视频
12:15Quantification of three DNA Lesions by Mass Spectrometry and Assessment of Their Levels in Tissues of Mice Exposed to Ambient Fine Particulate Matter
Published on: May 29, 2019
16:11Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
相关概念视频
01:23Mass Spectrum
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
01:12Electrospray Ionization (ESI) Mass Spectrometry
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...