(Table 1) Ages and depths of magnetostratigraphic boundaries in ODP Hole 132-810C

DOI

A magnetic stratigraphy study was undertaken on Hole 810C cores to provide age constraints and to characterize sedimentation on the summit of Shatsky Rise. Sediments from this hole are mostly nannofossil oozes recovered by the advanced hydraulic piston corer which gave virtually complete recovery to 136 m below seafloor. High-resolution magnetic measurements were made aboard ship with a pass-through cryogenic magnetometer, and these results were confirmed with discrete samples also measured with a cryogenic magnetometer. The sediments give clearly defined magnetic polarity zones within the upper 100 m below seafloor. It was possible to make a convincing match with the polarity reversal time scale from the surface to 76.8 m below seafloor, through the base of the Gilbert Chron near the Pliocene/Miocene boundary. Because of slow sedimentation and hiatuses punctuating the middle to upper Miocene section, the match with the time scale is less certain below this depth. For core recovered beneath 100 m below seafloor, it was mostly impossible to define clear polarity zones, except for a section of reversed polarity in Maastrichtian sediments, from 113.1 to 116.4 m below seafloor, that is tentatively correlated with Chron 31r. The magnetic stratigraphy shows that sediment accumulation was slow (about 2.5 m/m.y.) during the late Miocene, but increased to 15.0 to 18.5 m/m.y. during the late Pliocene and Pleistocene. Missing sections within the Matuyama Chron and an extended Brunhes Chron suggest that actual sediment accumulation rates were at times higher and lower than these averages. Furthermore, differences in sediment accumulation between Site 810 and nearby Site 577 suggest that the normal pelagic sedimentation regime atop Shatsky Rise is perturbed by bottom currents resulting in locally patchy sediment accumulation.

Supplement to: Sager, William W; Polgreen, Evelyn L; Rack, Frank R (1993): Magnetic polarity reversal stratigraphy of Hole 810C, Shatsky Rise, western Pacific Ocean. In: Natland, JH; Storms, MA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 132, 47-55

Identifier
DOI https://doi.org/10.1594/PANGAEA.785422
Related Identifier https://doi.org/10.2973/odp.proc.sr.132.304.1993
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.785422
Provenance
Creator Sager, William W; Polgreen, Evelyn L; Rack, Frank R
Publisher PANGAEA
Publication Year 1993
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 102 data points
Discipline Earth System Research
Spatial Coverage (157.846 LON, 32.423 LAT); North Pacific Ocean
Temporal Coverage Begin 1990-07-23T02:00:00Z
Temporal Coverage End 1990-07-28T08:00:00Z