GRAPE density of ODP Site 145-883

• Main Authors: Novak, Joseph B, Caballero-Gill, Rocio P, Rose, Rebecca, Herbert, Timothy D, Dowsett, Harry J
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: 145-883B; 145-883C; AGE; Age model; Alkenones; Benthic foraminifera assemblages; Benthic foraminiferal stable isotopes; Calcium Carbonate content; Composite splice; Density; wet bulk; Depth; composite; sediment/rock; diatoms; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Gamma-ray attenuation porosity evaluator (GRAPE); Joides Resolution; Leg145; North Pacific Ocean; Ocean Drilling Program; ODP; ODP 883; ODP 887; Sample code/label; stable carbon isotopes δ13C; stable oxygen isotopes; Subarctic North Pacific; Uk'37 sst and C37total; Pacific; Subarctic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.967367; https://doi.org/10.1594/PANGAEA.967367

New composite GRAPE WBD profile from our new splice at ODP site 883. The composite depth scale was created by visual correlation of the shipboard gamma ray attenuation and porosity evaluator (GRAPE) wet bulk density (WBD) measurements between 883B and 883C starting at core 10H and ending at 18H. 883B 11H-1 0–57 cm, 883B 12H-1 0–10 cm, 883B 15H-1 0–20 cm, 883C 15H-1 0–5 cm were not considered in the correlation exercise because the recovered sediments had sidewall cave-in characterized by pebbles typical of the overlying Pleistocene sediments. In almost all cores, recovery was > 100%. To account for this in terms of depth, cores with > 100% recovery were compressed uniformly and fixed to the top drill log depth (depth mbsf) assigned to that core. Subsequent correlation of cores between holes B and C revealed apparent gaps in recovery. Cores were further uniformly compressed to account for the unrecovered sediments and a composite stratigraphic section was stitched together by switching between the two holes. On average, cores were compressed 17% and at most by 28% of their drilled depth (9.5 m). The result of this exercise is a composite section of comparable depth to the driller's shipboard depth scale (109.4 meters below sea floor vs. 108.3 meters common depth) that accounts for all the major stratigraphic features present in the GRAPE WBD profiles of 883B and 883C.