Norcholestane in Miocene Onnagawa siliceous sediments, Japan

Details Norcholestane in Miocene Onnagawa siliceous sediments, Japan Norcholestane in Miocene Onnagawa siliceous sediments, Japan

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4539s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 18, pp.4539-4545

Mathematics

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3

Scientific paper

A significant amount of 24-norcholestane with 20R, 5 (H), 14 (H), 17 (H) stereochemistry is often found in marine siliceous sediments of the Middle Miocene Onnagawa Formation, Japan. Some Onnagawa siliceous sediments are abnormally abundant in 24-norcholestane. The primary production in the northeastern Japan Sea during the Middle Miocene was markedly increased due to the invasion of nutrient-rich cold seawater from the north accompanied by the tectonic opening of the Japan Sea. 24-norcholestane in high relative abundance is derived mainly from the marine diatoms which were enhanced during this event. The drastic ecological change caused by rapid tectonic opening of the Japan Sea and global climatic deterioration during Middle Miocene time is suggested to be influential in the formation of 24-norcholestane-rich Onnagawa siliceous sediments.

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