Linking carbon cycle perturbations to the Late Ordovician glaciation and mass extinction: A modeling approach
文献类型：期刊论文
| 作者 | Zhang, Junpeng2,11,12,13; Li, Chao12,13; Zhong, Yangyang10; Wu, Xuejin9,12,13; Fang, Xiang12,13; Liu, Mu8; Chen, Daizhao8; Gill, Benjamin C.7; Algeo, Thomas J.1,4,5,6; Lyons, Timothy W. |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2024-04-01 |
| 卷号 | 631页码:9 |
| 关键词 | Carbon isotopes Hirnantian glaciation Weathering Volcanism LOME HICE |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2024.118635 |
| 英文摘要 | The Hirnantian Stage of the Late Ordovician coincides with a positive carbon isotope excursion (HICE, similar to+6 parts per thousand), a major glaciation, increased volcanic activity, expanded marine anoxia, and one of the largest mass extinctions of the Phanerozoic. The origin of the HICE is debated, with proposed mechanisms favoring enhanced low-latitude carbonate weathering and/or increased efficiency of organic carbon burial. To test those hypotheses, we assembled new and published delta C-13(carb) and delta C-13(org) data and shale phosphorus and carbonate-associated phosphate concentrations from diverse depositional settings on several continents. We then evaluated these results using an integrated carbon cycle model derived from GEOCARB, and a coupled oceanic carbon and phosphorus cycle model. This approach yielded quantitative tests of the response of the global carbon cycle to changes in volcanic degassing, silicate and carbonate weathering rates, and organic carbon burial, individually and in combination, to determine which forcings yield signals most aligned with observed delta C-13(carb) and delta C-13(org) records. On this basis, the most plausible scenario for the HICE involves a similar to 50 % decrease in weathering of silicates and organic carbon at higher latitudes combined with enhanced carbonate weathering (f(wcarb) = 88 %) at lower latitudes. Synchronous, globally enhanced burial of organic carbon was due to more efficient nutrient cycling caused by stronger thermohaline circulation and increased volcanism that further enriched oceanic dissolved inorganic carbon (DIC) in C-13. The influence of increased input of C-13-depleted carbon from volcanism and metamorphism may have been overwhelmed by these drivers of the positive delta C-13 shift. The Hirnantian Glaciation was likely initiated by secular enhancement of continental weathering due to the expansion of early plants but was terminated by increased volcanism and decreased CO2 consumption by silicate weathering during the cooling. This scenario is consistent with the timeline of known geological events and offers insights into the mechanisms responsible for the associated biotic crisis. Specifically, the onset of the Hirnantian Glaciation induced lower global temperatures, resulting in sea-level fall and a loss of habitat space, while its termination led to enhanced organic carbon export and deep-water anoxia, all of which likely contributed to the Late Ordovician mass extinction. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001206339000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77087]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Zhang, Junpeng |
| 作者单位 | 1.Univ Cincinnati, Dept Geosci, Cincinnati, OH 45221 USA 2.Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA 92521 USA 3.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 5.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China 6.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 7.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA 8.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China 9.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 10.East China Univ Technol, Sch Earth Sci, Nanchang 330013, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Junpeng,Li, Chao,Zhong, Yangyang,et al. Linking carbon cycle perturbations to the Late Ordovician glaciation and mass extinction: A modeling approach[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,631:9. |
| APA | Zhang, Junpeng.,Li, Chao.,Zhong, Yangyang.,Wu, Xuejin.,Fang, Xiang.,...&Tian, Hui.(2024).Linking carbon cycle perturbations to the Late Ordovician glaciation and mass extinction: A modeling approach.EARTH AND PLANETARY SCIENCE LETTERS,631,9. |
| MLA | Zhang, Junpeng,et al."Linking carbon cycle perturbations to the Late Ordovician glaciation and mass extinction: A modeling approach".EARTH AND PLANETARY SCIENCE LETTERS 631(2024):9. |
入库方式： OAI收割
来源：广州地球化学研究所
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