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iron speciation(2)
trace elements(2)
anoxia(1)
clay mineralogy(1)
end-permian mass extinction(1)
euxinia(1)
illite-smectite(1)
neodymium(1)
nitrogen isotope of kerogen(1)
permian-triassic boundary(1)
pyroclastic(1)
rees(1)
shangsi(1)
strontium(1)