Orbital-scale changes in redox condition and biogenic silica/detrital fluxes of the Middle Jurassic Radiolarite in Tethys (Sogno, Lombardy, N-Italy): Possible link with glaciation?
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- 作者：Masayuki Ikedaa ; ikeda.masayuki@shizuoka.ac.jp" class="auth_mail" title="E-mail the corresponding author ; Maximilien Bô ; leb ; Peter O. Baumgartnerb
- 关键词：Radiolarite ; Milankovitch cycle ; Transgression-regression ; Middle Jurassic oceanic anoxic events
- 刊名：Palaeogeography, Palaeoclimatology, Palaeoecology
- 出版年：2016
- 出版时间：1 September 2016
- 年：2016
- 卷：457
- 期：Complete
- 页码：247-257
- 全文大小：3956 K
文摘
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Cyclostratigraphy of the Middle Jurassic Basal Radiolarites spans ~ 4 Myr.
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Chert abundance (chert/shale thickness ratio) and darkness show orbital-scale cycles.
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Black cherts in high chert abundance intervals reflected productivity induced anoxia.
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Black cherts in low chert abundance intervals reflected stratification induced anoxia during low stand.
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405 kyr cycles might correspond glacial eustatic cycles.