Evans, Helen F. et al. (2006): Late Miocene-Holocene magnetic polarity stratigraphy and astrochronology, ODP Leg 198, Shatsky Rise

ODP 198


Evans, Helen F.
University of Florida, Department of Geological Sciences, Gainesville, FL, United States

Channell, James E. T.
Universita di Milano, Italy

Sager, William W.
Ocean Drilling Program, United States

Late Miocene-Holocene magnetic polarity stratigraphy and astrochronology, ODP Leg 198, Shatsky Rise
In: Bralower, Timothy J., Premoli Silva, Isabella, Malone, Mitchell J., Arthur, Michael A., Averyt, Kristen B., Bown, Paul R., Brassell, Simon C., Channell, James E. T., Clarke, Leon J., Dutton, Andrea, Eleson, Jason W., Frank, Tracy D., Gylesjo, Susanne, Hancock, Haidi J. L., Kano, Harumasa, Leckie, R. Mark, Marsaglia, Kathleen M., McGuire, Jennifer, Moe, K. T., Petrizzo, Maria Rose, Robinson, Stuart A., Roehl, Ursula, Sager, William W., Takeda, Kotaro, Thomas, Deborah, Williams, Trevor, Zachos, James C., Proceedings of the Ocean Drilling Program; scientific results; extreme warmth in the Cretaceous and Paleogene; a depth transect on Shatsky Rise, Central Pacific; covering Leg 198 of the cruises of the drilling vessel JOIDES Resolution; Yokohama, Japan, to Honolulu, Hawaii; Sites 1207-1214; 27 August-23 October 2001
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Shatsky Rise, a medium-sized large igneous province in the west Central Pacific Ocean, has three main topographic highs that preserve a thick sedimentary record from Cretaceous through Cenozoic. During Ocean Drilling Program (ODP) Leg 198 to Shatsky Rise, a total of approximately 768 m of late Miocene-Holocene sediments was recovered from six sites. Sites 1207 and 1208 were drilled on the Northern and Central Highs, respectively, and yielded expanded late Miocene-Holocene sequences. Sites 1209, 1210, 1211, and 1212 were drilled on the Southern High and yielded shorter sequences of similar age. Clearly interpretable magnetic stratigraphies were obtained from all sites using the shipboard passthrough magnetometer. These results were augmented using discrete sample cubes (7 cm (super 3) ) collected shipboard and measured postcruise. Miocene age sediments are separated by a hiatus from Oligocene, Eocene, and Cretaceous age sediments beneath. An astrochronological age model was developed for the six sites based on cycles observed in reflectance data, measured shipboard. This age model is in good agreement with published astrochronological polarity chron ages in the 1- to 6-Ma interval.
Coverage:Geographic coordinates:
West:157.1500East: 162.4600

Stratigraphy; alternating field demagnetization; astrochronology; Cenozoic; demagnetization; Holocene; Leg 198; magnetization; magnetostratigraphy; marine sediments; Miocene; natural remanent magnetization; Neogene; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; paleomagnetism; Pliocene; Quaternary; remanent magnetization; sediments; Shatsky Rise; Tertiary; upper Miocene; West Pacific;