Porosity and density of the AND-1B sediment core ...

• Main Authors: Niessen, Frank, Gebhardt, Catalina, Kuhn, Gerhard, Magens, Diana, Monien, Donata
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: Drilling/drill rig; MIS; McMurdo Station; Antarctic Geological Drilling ANDRILL; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Catalina; McMurdo Sound; The Antarctic; Antarc*; Antarctica; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.834619; https://doi.pangaea.de/10.1594/PANGAEA.834619

A study of density and porosity is presented for the 1285-m-long AND-1B core recovered from a flexural moat in the McMurdo Sound (Antarctica) in order to interpret sediment consolidation in an ice-proximal location on the Antarctic shelf. Various lithologies imply environmental changes from open marine to subglacial, and are numerically expressed in high-resolution whole-core wet-bulk density (WBD). Grain density data interpolated from discrete samples range from 2.14 to 3.85 g/cm3 and are used to calculate porosity from WBD in order to avoid the 5%-15% overestimation and underestimation of porosities obtained by standard methods. The trend of porosity extends from 0.5 near the top (Pleistocene) to 0.2 at the bottom (Miocene). Porosity fluctuations in different lithologies are superimposed with 0.2-0.3 in sequences younger than ca. 1 Ma and 0.5-0.8 in Pliocene diatomites. The AND-1B porosities and void ratios of Pliocene diatomites and Pleistocene mudstones exhibit a large negative offset compared to modern ... : Supplement to: Niessen, Frank; Gebhardt, Catalina; Kuhn, Gerhard; Magens, Diana; Monien, Donata (2013): Porosity and density of the AND-1B sediment core, McMurdo Sound region, Antarctica: Field consolidation enhanced by grounded ice. Geosphere, 9(3), 489-509 ...