Chronostratigraphy of CRP-2/2A, Victoria Land Basin, Antarctica

摘要: The 624.15 m glaciomarine sedimentary succession recovered in the CRP-2/2A drillcore comprises lower Oligocene (< c. 31 Ma) to Miocene (18.5 strata that are overlain by a thin of Pliocene and Pleistocene strata. age model for drillhole, as presented this paper, is based on combined microfossil biostratigraphy, 40Ar/39Ar ages volcanic material, 87Sr/86Sr analyses mollusc shells, correlation magnetic polarity zonation time scale (MPTS). Between 25.92 109.05 metres below sea floor (mbsf), several alternative correlations MPTS possible, all which suggest sediment accumulation rates averaged ~180 m/m.y. between unconformities, although actual sedimentation may have been higher. 306.65 mbsf, straightforward average were much higher (≥1000 m/m.y.). mbsf bottom (624.15 mbsf), fewer datums available constrain unique with not high likely. A significant unconformity identified at represent 5 m.y. missing time. Additional unconformities 130.27 account 16 2.5 time, respectively. interval documented spans about 13 million years, however, it possible more sequence-bounding than represented stratigraphic record drillcore.