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Zinc isotope evidence for intensive magmatism immediately before the end-Permian mass extinction
Sheng-Ao Liu; Huaichun Wu; Shu-zhong Shen (沈树忠); Ganqing Jiang; Shihong Zhang; Yiwen Lv; Hua Zhang (张华); Shuguang Li
2017
Source PublicationGeology
ISSN0091-7613
Volume45Issue:4Pages:343-346
AbstractThe end-Permian extinction is typically ascribed to massive volcanic eruptions, but direct geochemical evidence linking the two independent events is generally lacking. Zinc is an important micronutrient of marine phytoplanktons, and Zn isotope (delta Zn-66) ratios of seawater are markedly higher than those of volcanic rocks and riverine waters. We conducted high-resolution Zn concentration and Zn isotope analyses on carbonate rocks across the Permian-Triassic boundary (PTB) in the Meishan section of south China. An abrupt increase of Zn concentration and a concomitant 0.5 parts per thousand decrease in delta Zn-66 occur similar to 35 k.y. before the mass extinction and carbon isotope (delta C-13) minima. Mass balance calculation demonstrates that a 0.5 parts per thousand negative shift in delta Zn-66 within thousands of years requires rapid and massive input of isotopically light Zn from volcanic ashes, hydrothermal inputs, and/or extremely fast weathering of large igneous provinces. A positive delta Zn-66 shift of as much as 1.0 parts per thousand following the mass extinction demonstrates that primary productivity recovered and reached a maximum in fewer than 360 k.y. Our finding provides insights into the marine Zn cycling across the PTB and clarifies the temporal relationship and duration of events, including intensive volcanism, carbon isotope excursion, mass extinction, and widespread ocean anoxia.
DOI10.1130/G38644.1
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000396125700016
PublisherGEOLOGICAL SOC AMER, INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13128
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorSheng-Ao Liu
Recommended Citation
GB/T 7714
Sheng-Ao Liu,Huaichun Wu,Shu-zhong Shen ,et al. Zinc isotope evidence for intensive magmatism immediately before the end-Permian mass extinction[J]. Geology,2017,45(4):343-346.
APA Sheng-Ao Liu.,Huaichun Wu.,Shu-zhong Shen .,Ganqing Jiang.,Shihong Zhang.,...&Shuguang Li.(2017).Zinc isotope evidence for intensive magmatism immediately before the end-Permian mass extinction.Geology,45(4),343-346.
MLA Sheng-Ao Liu,et al."Zinc isotope evidence for intensive magmatism immediately before the end-Permian mass extinction".Geology 45.4(2017):343-346.
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