3806 Ma Isua rhyolites and dacites affected by low temperature Eoarchaean surficial alteration: Earth's earliest weathering
Precambrian Research(2015)
摘要
•Isua 3806Ma felsic schists are derived from arc-related volcanic rocks.•Their whole rock chemistry shows K↔Na exchange with plagioclase destruction.•Zircon O and Hf isotopic ratios are mantle-like, but whole rock δ18OVSMOW is >+14‰.•The felsic schist unit preserves evidence for the oldest weathering (∼3800Ma).
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关键词
Eoarchaean weathering,Oxygen isotopes,Eoarchaean felsic volcanic rocks,CO2 drawdown,Biomediation
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