McGuire, Jennifer C. and Acton, Gary D. (2003): Composite depth scales for the Japan Trench, ODP Leg 186

ODP 186
ODP 186 1150
ODP 186 1151


McGuire, Jennifer C.
Texas A&M University, Ocean Drilling Program, College Station, TX, United States

Acton, Gary D.
Carnegie Institution of Washington, United States

Composite depth scales for the Japan Trench, ODP Leg 186
In: Suyehiro, Kiyoshi, Sacks, I. Selwyn, Acton, Gary D., Acierno, Michael J., Araki, Eiichiro, Ask, Maria V. S., Ikeda, Akihiro, Kanamatsu, Toshiya, Kim, Gil Young, Li, Jingfen, Linde, Alan T., McWhorter, Paul N., Mora, German, Najman, Yanina M. R., Niitsuma, Nobuaki, Pandit, Benoy K., Roller, Sybille, Saito, Saneatsu, Sakamoto, Tatsuhiko, Shinohara, Masanao, Sun, Yue-Feng, Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
We present composite depth scales for the multiply cored intervals from Sites 1150 and 1151. These new depth scales place coeval strata recovered in cores from different holes at a single site into a common stratigraphic framework. At Site 1150, double coring between Holes 1150A and 1150B occurred over only a short interval between approximately 703 and 713 meters below seafloor (mbsf), but this is sufficient to tie the upper portion of the stratigraphic section cored in Hole 1150A to the lower portion cored in Hole 1150B. The upper 100 m of the sedimentary section at Site 1151 was double cored with the advanced piston corer and partially cored with the rotary core barrel, resulting in the complete recovery of this interval. The composite depth scales were constructed using Splicer software to vertically adjust the relative depths of various cores from one hole to the depths from another hole so as to align distinct physical properties measured on cores. The magnetic susceptibility data was the physical property most easily correlated between holes, and therefore primarily used to create a composite depth scale and spliced stratigraphic section. The spliced section is a continuous stratigraphic section constructed from representative cored intervals from the holes at a site. Both the splice and the composite depth scale can be applied to other data sets from Site 1151 to provide a stratigraphically continuous and laterally consistent basis for interpreting lithologic features or data sets. The resulting composite scale showed a 30% improvement in correlation of the magnetic susceptibility data relative to the original mbsf depth scale, and comparable improvement when applied to the other data sets.
Coverage:Geographic coordinates:
West:143.2000East: 143.2000

Stratigraphy; Brunhes Chron; Cenozoic; depth; Japan Trench; Leg 186; lithostratigraphy; magnetic susceptibility; magnetostratigraphy; marine sediments; Miocene; Neogene; North Pacific; Northwest Pacific; Ocean Drilling Program; ocean floors; ODP Site 1150; ODP Site 1151; Pacific Ocean; paleomagnetism; Quaternary; sedimentation; sedimentation rates; sediments; Tertiary; upper Quaternary; West Pacific;