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Nonmonotonic Postdeglacial Relative Sea Level Changes at the Aftermath of Marinoan (635 Ma) Snowball Earth Meltdown
Yoshiya Irie;  Masao Nakada;  Jun'ichi Okuno;  Huiming Bao
2019
Source PublicationJournal of Geophysical Research: Solid Earth
Volume124Issue:8Pages:9373-9394
Abstract

Marinoan snowball Earth offers us a set of sedimentary and geochemical records for exploring glacial isostatic adjustment (GIA) associated with one of the most severe glaciations in Earth history. An accurate prediction of GIA‐based relative sea level (RSL) change associated with a snowball Earth meltdown will help to explore sedimentary records for RSL changes and to place independent constraints on mantle viscosity and on the durations of syndeglaciation (Td) and cap carbonate deposition. Here we mainly examine postdeglacial RSL change characterized by an RSL drop and a resumed transgression inferred from the cap dolostones on the continental shelf in south China. Such a nonmonotonic RSL behavior may be a diagnostic GIA signal for the Marinoan deglaciation resulting from a significantly longer postdeglacial GIA response than that for the last deglaciation. A postdeglacial RSL drop followed by transgression in south China, which is significantly affected by Earth's rotation, is predicted over the continental shelf for models with Td ≤ 20 kyr and a deep mantle viscosity of ~5 × 1022 Pa s regardless of the upper mantle viscosity. The inferred GIA model also explains the postdeglacial RSL changes such as sedimentary‐inferred RSL drops on the continental shelf in northwestern Canada and California at low‐latitude regions insignificantly affected by Earth's rotation. Furthermore, the good match between the predicted and observed RSL changes in south China suggests an approximate duration of ~50 kyr for the Marinoan 17O depletion event, an atmospheric event linked to the post‐Marinoan drawdown of CO2 and the concurrent rise of O2.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10856
Collection矿床地球化学国家重点实验室
Affiliation1.Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, Fukuoka, Japan
2.Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka, Japan
3.National Instituteof Polar Research, Tachikawa, Japan
4.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
5.Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, USA
Recommended Citation
GB/T 7714
Yoshiya Irie;Masao Nakada;Jun'ichi Okuno;Huiming Bao. Nonmonotonic Postdeglacial Relative Sea Level Changes at the Aftermath of Marinoan (635 Ma) Snowball Earth Meltdown[J]. Journal of Geophysical Research: Solid Earth,2019,124(8):9373-9394.
APA Yoshiya Irie;Masao Nakada;Jun'ichi Okuno;Huiming Bao.(2019).Nonmonotonic Postdeglacial Relative Sea Level Changes at the Aftermath of Marinoan (635 Ma) Snowball Earth Meltdown.Journal of Geophysical Research: Solid Earth,124(8),9373-9394.
MLA Yoshiya Irie;Masao Nakada;Jun'ichi Okuno;Huiming Bao."Nonmonotonic Postdeglacial Relative Sea Level Changes at the Aftermath of Marinoan (635 Ma) Snowball Earth Meltdown".Journal of Geophysical Research: Solid Earth 124.8(2019):9373-9394.
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