Color Reflectance and Seismic Reflection of West Carolina Basin, Result from IODP (2006)



Geophisical measurement and four piston core drillings have conducted at West Carolina Basin, north Irian Island. This research have done by research cruise R/V Kairei 05-15 owned by Japan Agency for Marine-Earth Science and Technology. Another objective of this cruise is to conduct a site survey for the IODP (Integrated Ocean Drilling Program) proposal 612. From sub-bottom profiles, it is recognized that the survey areas are covered with well-stratified thick sedimentary layers except for small seamounts. A characteristic feature of the survey areas is the gently undulating seafloor. From sub-bottom profiles, it is revealed that the undulation is caused by occurrence of numerous faulted blocks All four sites show similar seismic characteristics. Acoustic basements, which correspond to oceanic crusts of Oligocene age, are covered with thick transparent sedimentary layers. The numerous faults observed on the topography and sub-bottom profiles can also be recognized on the seismic reflection profiles Color reflectance was measured using the Minolta Photospectrometer CM-2002. The split surface of archive halves was measured on every 2 cm through crystal clear polyethylene wrap. The color reflectance data are displayed as color parameters L*, a*, and b* (L*: black and white, a*: red and green, b*: yellow and blue). For all cores, the several tens of centimeters from the top are generally characterized by high a* and b*. The L* values fluctuate throughout the cores. The variation patterns in L*, a*, and b* between PL01 and PC01, PL02 and PC02, PL04 and PC04 show consistency, which suggests the good recovery of surface sediments by the piston corer


Author : Eddy Z. Gaffar, Doddy R Galih, Toshitsugu Yamazaki, Toshitya Kanamatsu, Hirokuni Oda, Yusuke Suganuma