Acid Character of Archean Ocean Waters Revealed by 3.3 Ga-old Ferruginous Chert Compositions, Western Australia.
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概要
- 論文の詳細を見る
Comparative inspection of Archean ferruginous cherts with Phanerozoic cherts shows that the former precipitated from acid-water hydrothermally supplied during intensive early Precambrian volcanism. The pH of the water is inferred to have been around 4 where Al dissolves, and Ti and Zr do not. The peculiar geochemical environment seems to have been widespread in Archean to early Proterozoic greenstone basins when tremendous volume of banded iron formation (BIF) formed. This suggests that the acid seas were neutralized after the BIF deposition probably during the middle to late Proterozoic; this change of pH in sea water may have promoted the deposition of carbonate rocks.
- 日本学士院の論文
著者
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Sugitani Kenichiro
Department Of Environmental Engineering And Architecture Graduate School Of Environmental Studies Na
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Adachi Mamoru
Department Of Anesthesiology Fukushima Medical College
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Sugisaki Ryuichi
Deparment of Earh Sciences, School of Science, Nagoya University
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SUGITANI Kenichiro
Department of Natural Science and Informatics, Nagoya University
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HORIUCHI Yoshikuni
Nihon Cement Co. Ltd.
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