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This paper presents an overview of the physical properties and sedimentologic results from six Ocean Drilling Program Leg 151 sites cored on the Iceland Plateau (Hole 907A), in the Fram Strait region (Sites 908 and 909), and on the Yermak Plateau (Sites 910-912). The primary objective of this paper is to determine to what extent wet bulk density measured using the gamma-ray attenuation porosity evaluator (GRAPE) can be used to interpret textural and compositional changes in sediment accumulation at the various sites around the Nordic Seas and Arctic Ocean. To accomplish this objective, we have first established quantitative relationships between discrete measurements of bulk density and GRAPE bulk density at nine holes and have evaluated the frequency distribution of GRAPE bulk density data at the same holes to detect significant differences between sites. We have also evaluated the frequency distribution of magnetic susceptibility data at these holes because this rock magnetic parameter is most often used in combination with GRAPE measurements for correlation purposes. These two parameters are also used for evaluating compositional and textural changes in sedimentary inputs. Composite depth profiles have been developed for three sites (Sites 908, 909, and 911) using both GRAPE bulk density and magnetic susceptibility measurements made on cores from multiple, adjacent holes at these sites. The composite depth profiles provide a more continuous record of property variations in the upper 100 meters below seafloor at a given site than is provided by the data collected at a single hole. The composites also provide the framework for more detailed paleoceanographic and paleoclimatic analyses of the records from these sites (i.e., spectral analysis of time series, astronomic tuning of records, etc.). These activities will be pursued in future contributions related to these data.

proceedings of the ocean drilling program

Development of Physical Properties Relationships, Interhole Composite Depth Profiles, and Sedimentologic Ground Truthing of Multi-Sensor Core Measurements: A Synthesis of Results