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Environmental changes during Frasnian-Famennian transition in south China: A multiproxy approach
Xu, Bing1; Gu, Zhaoyan1; Han, Jingtai1; Wang, Chengyuan (王成源)2

This study presents high-resolution multiproxy analyses on two Late Devonian sequences for characterizing the environmental changes during the Frasnian-Famennian (F-F) transition in south China. Carbon isotope signatures of the carbonate and organic matter consistently show two positive excursions in the late rhenana zone and around the F-F boundary, implying two increased organic carbon burial events. These observations are consistent with the records from other continents, providing further support for the documented perturbations of the global carbon cycle. Redox indices, mainly of the Cu/Al and U/Al ratios, and hydrothermal-volcanic proxies, Al/(Al + Fe) and Zr/Al, indicate reducing conditions and increased hydrothermal-volcanic activities during these carbon isotope excursions. High-resolution investigations revealed that the reducing conditions predate the onset of the carbon isotope excursions, suggesting that the two positive carbon isotope shifts are likely caused by the expansion of anoxic conditions. The low Al/(Al + Fe) ratio around the F-F boundary leads the U/Al and Cu/Al anomalies in timing, implying that this anoxic event might have resulted from a long-term cumulative effect of intense hydrothermal-volcanic activities. In the late rhenana zone, enhanced hydrothermal activity also seems responsible for the reducing conditions.

WOS KeywordCarbon-isotope Stratigraphy ; Frasnian/famennian Boundary Interval ; Devonian Mass Extinction ; Global Carbon ; Great-basin ; Sea-level ; Sequence Stratigraphy ; Geochemical Records ; Strontium Isotopes ; Western-australia
Funding ProjectNational Natural Science Foundation[40672118] ; National Key Project for basic research[G2000077708]
WOS Research AreaEnvironmental Sciences & Ecology ; Geology
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000262042500001
Funding OrganizationNational Natural Science Foundation ; National Key Project for basic research
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Document Type期刊论文
Corresponding AuthorXu, Bing
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Xu, Bing,Gu, Zhaoyan,Han, Jingtai,et al. Environmental changes during Frasnian-Famennian transition in south China: A multiproxy approach[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2008,113(G4):11.
APA Xu, Bing,Gu, Zhaoyan,Han, Jingtai,&Wang, Chengyuan .(2008).Environmental changes during Frasnian-Famennian transition in south China: A multiproxy approach.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,113(G4),11.
MLA Xu, Bing,et al."Environmental changes during Frasnian-Famennian transition in south China: A multiproxy approach".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 113.G4(2008):11.
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