Magnetostratigraphic age-depth tie points of ODP Leg 208 sites

We report the paleomagnetic and rock magnetic results from discrete sample analysis of sediments from Walvis Ridge, Leg 208 of the Ocean Drilling Program. In an effort to refine the shipboard magnetostratigraphy, alternating field and thermal demagnetization of discrete samples were carried out, pre...

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Bibliographic Details
Main Author: Bowles, Julie
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2006
Subjects:
208-1262
208-1263
208-1264
208-1265
208-1266
208-1267
COMPCORE
Composite Core
Joides Resolution
Leg208
Ocean Drilling Program
ODP
South Atlantic Ocean
Walvis Ridge
Southeast Atlantic Ocean
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.776196
https://doi.org/10.1594/PANGAEA.776196
Description
Summary:We report the paleomagnetic and rock magnetic results from discrete sample analysis of sediments from Walvis Ridge, Leg 208 of the Ocean Drilling Program. In an effort to refine the shipboard magnetostratigraphy, alternating field and thermal demagnetization of discrete samples were carried out, predominantly on samples from Sites 1262 and 1267. Results are generally consistent with the shipboard pass-through cryomagnetometer data, though in some cases the discrete samples resolved ambiguities in the reversal record. Significantly, the C24r/C24n reversal boundary was identified at Sites 1262 and 1267, and most boundaries in the Paleocene and Upper Cretaceous sections are now identified to within 10-30 cm. Magnetic mineralogy results show that prior to the late Miocene, the predominant detrital magnetic component was coarse-grained magnetite and that after the late Miocene, titanomagnetite has also been present. This suggests a possible change in detrital source at that time.

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