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      Data report: paleomagnetic direction measurements on Oligocene sediments from Hole U1439A, Izu-Bonin-Mariana fore arc

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          Abstract

          Oligocene basal sediment samples from Hole U1439A, located on the Izu-Bonin-Mariana fore arc, were measured to determine paleomagnetic polarity and paleoinclination. A total of 57 samples from Cores 352-U1439A-16X through 19X were measured using thermal demagnetization to isolate the characteristic remanent magnetization (ChRM). The samples were relatively strongly magnetized, with about half having natural remanent magnetization intensities >100 mA/m. Most samples produced demagnetization results consistent enough to calculate a ChRM direction using principal component analysis, but the intrasample demagnetization consistency ranged from good to poor, indicating variable sample-recording fidelity. Paleoinclination values indicate at least two polarity zones, with a zone of normal polarity in Cores 16X and 17X overlying a reversed polarity zone in Core 18X. Unfortunately, normal paleoinclination values are significantly higher than reversed values, indicating that a downward-pointing overprint, probably caused by the drill string, was not completely removed by the demagnetization procedure. Thus, the paleoinclination values appear biased.

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          The least-squares line and plane and the analysis of palaeomagnetic data

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            A. C. Demagnetization of Rocks: Analysis of Results

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                Author and article information

                Journal
                10.14379/iodp.proc.352.2015
                Proceedings of the International Ocean Discovery Program
                International Ocean Discovery Program
                2377-3189
                08 May 2018
                Article
                10.14379/iodp.proc.352.203.2018
                ba8b1daa-5cb7-4678-98d4-b085e6dfaa5c

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

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