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Seminars
GIA-based sea level change due to Marinoan snowball Earth deglaciation
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speaker: Yoshiya Irie
place: 物理楼北547
time: 2019年12月18日,周三,16:10—17:00

摘要:

Marinoan snowball Earth, which ended at ~635 Ma, 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 sea level change associated with a snowball Earth deglaciation will help to explore sedimentary records for sea level changes and to place independent constraints on mantle viscosity and on the deglaciation duration. I mainly examine post-deglacial sea level change characterized by a sea level drop and a resumed sea level rise inferred from the sedimentary records in South China. Such a non-monotonic sea level behavior may be a diagnostic GIA-signal for the Marinoan deglaciation. GIA-model with high deep mantle viscosity and rapid deglaciation explains sedimentary-inferred sea level records.