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【Coshare Science】南京大学鲍惠铭教授:地质历史中的同位素异常大镜像

  • 2026-04-10 04:06:03
【Coshare Science】南京大学鲍惠铭教授:地质历史中的同位素异常大镜像

地质历史中的同位素异常大镜像

Nanjing University | Huiming Bao

--Coshare Science

在地球复杂且不可逆的演化过程中,大气中氧气浓度存在一个阈值(因而大气臭氧柱总厚度也存在一个阈值)。低于该阈值时,深紫外线可以到达地面或对流层,非质量依赖性(NMD)硫同位素分馏可以通过地表火山二氧化硫的光解作用产生,并且其特征(即非零的Δ33S值)会被保存在岩石记录中。高于该阈值时,对流层中不再产生NMD硫同位素特征,并且由于微生物硫氧化还原循环强度的增加,即使有少量产生也难将其保存在岩石记录中。取而代之的是,大气中会出现NMD氧同位素特征。这是因为低于该阈值时,大气中的CO2-O2-O3反应网络强度微乎其微。当大气氧分压(pO2)高于阈值时,大气中的O2表现出非质量依赖性的17O亏损,而O3则表现出相应的17O盈余,即两者都具有Δ17O非零值。根据大气化学模型,该pO2阈值可能相当于目前大气水平的10-5Pavlov and Kasting, 2002; Wogan et al., 2022)。这一转变被称为大氧化事件(GOE),发生在约23亿年前,之后大气中的CO2-O2-O3反应网络强度变得更显著。因此,大气化合物的Δ33S和Δ17O应该在地球近46亿年的历史轴上互为镜像,分界点约为23亿年前。

这就是我在最近的一篇“文章”中提出的一个概念:地质历史中的同位素异常大镜像(The Grand Mirror of Isotope Anomalies or GMIA)。早期的一个版本我2013年夏天在意大利佛罗伦萨的Goldschmidt Conference上做过报告 (“Direct Atmospheric O3 and OSignatures from the Deep Past and Their First-Order Pattern”)。

“同位素异常大镜像”很简洁地概括了整个地球演化历史的一个框架。这个词好记。我推荐各位教地史的老师多用(包括文章引用:H. Bao, The grand mirror of isotope anomalies, Coshare Science 04, 04 (2026). DOI: https://doi.org/10.61109/cs.202603.162)。

📢我的推荐如此别致,以至于我第一次采用了盼望已久的视频“文章“(2013年在佛罗伦萨的精彩没有被录像的遗憾终于被填补了些)。

😄我的推荐如此真诚,以至于我翻出了30多年前买的西装(这里有多层意义的凡尔赛,比如依旧合身)。

🎥我的推荐如此急切,以至于我在面容消瘦时便兴致勃勃地走到绿幕前。

视频:https://www.cosharescience.com/videos/cs.202603.162

扫码观看

👀要看趁早看

这次可是真人上场

下次你就分不清是真人还是数字人了😄

参考文献:

• Pavlov, A. A., and J. F. Kasting. Mass-independent fractionation of sulfur isotopes in Archean sediments: strong evidence for an anoxic Archean atmosphere. Astrobiology 2.1 (2002): 27-41. DOI: https://doi.org/10.1089/153110702753621321

• Wogan, Nicholas F., et al. Rapid timescale for an oxic transition during the Great Oxidation Event and the instability of low atmospheric O2. Proceedings of the National Academy of Sciences 119.37 (2022): e2205618119. DOI: https://doi.org/10.1073/pnas.2205618119

• H. Bao, Direct Atmospheric O and O Signatures from the Deep Past and their First-Order Pattern. Mineralogical Magazine (2013) 77 (5): 650. DOI: https://doi.org/10.1180/minmag.2013.077.5.2

• H. Bao, The grand mirror of isotope anomalies, Coshare Science 04, 04 (2026). DOI: https://doi.org/10.61109/cs.202603.162

声明:文章内部分内容来源于互联网,微信公众号等公开渠道,我们对文中观点持中立态度,本文仅供参考、交流。转载的稿件及其文字、图片版权归原作者和机构所有,如有侵权,请联系我们删除。

往期精彩回顾

海南省地质地理学会2025年学术年会

地质科技前沿论坛第2期:“地球物理探测技术”专题

第二十一届全国数学地质与地学信息学术研讨会

南极的地质学家——企鹅

【视频回放】第十二届全国工程地质大会

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  1. CONNECT:[ UseTime:0.000430s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000598s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000273s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000538s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000618s ]
  8. SELECT * FROM `article` WHERE `id` = 519289 LIMIT 1 [ RunTime:0.006826s ]
  9. UPDATE `article` SET `lasttime` = 1777202827 WHERE `id` = 519289 [ RunTime:0.005709s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 519289 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000483s ]
  12. SELECT * FROM `article` WHERE `id` > 519289 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001041s ]
  13. SELECT * FROM `article` WHERE `id` < 519289 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000811s ]
  14. SELECT * FROM `article` WHERE `id` < 519289 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003125s ]
  15. SELECT * FROM `article` WHERE `id` < 519289 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004279s ]
0.126728s