Dataset of characteristic remanent magnetization and magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform)

This data article describes data of magnetic stratigraphy and anisotropy of isothermal remanent magnetization (AIRM) from “Magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform) reveal changes in the monsoon system” [1]. Acquisition of isothermal magnetization on pilot samples and anisotropy of isothermal remanent magnetization are reported as raw data; magnetostratigraphic data are reported as characteristic magnetization (ChRM).

This data article describes data of magnetic stratigraphy and anisotropy of isothermal remanent magnetization (AIRM) from "Magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform) reveal changes in the monsoon system" [1]. Acquisition of isothermal magnetization on pilot samples and anisotropy of isothermal remanent magnetization are reported as raw data; magnetostratigraphic data are reported as characteristic magnetization (ChRM).
© 2019 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons. org/licenses/by/4.0/).

Data
This dataset describes the acquisition of IRM, the median destructive field, the magnetostratigraphy and the anisotropy of IRM of the Pliocene sediments from IODP Site U1467.
IRM acquisition and the median destructive field describe the magnetic mineralogy of the sediments (see Ref. [1], Figure 2). Magnetostratigraphic data describes the direction of geomagnetic pole and are reported as characteristic remanent magnetization (ChRM) and as latitude of virtual geomagnetic pole (see Ref. [1] Figure 5). The intensity of natural remanent magnetization, the number of demagnetization steps and the maximum angular deviation are included to access the quality of the data. The age model data describe the magnetostratigraphic age of the sediments (see Ref. [1] Figure 6).
Anisotropy data describes the statistical orientation of elongated magnetic particles. They are reported as magnitude and direction of the main anisotropy axis (I 1 , I 2 , and I 3 ). The descriptive parameters P 0 and T (see Ref. [1], Figure 4) are also reported for practical purpose although they can be calculated from the anisotropy axis.
Data are reported in a table format as Excel data sheet. Values are described in Table 1.

Experimental design, materials, and methods
Standard paleomagnetic specimens (plastic cubes, with a volume of 7 cm 3 ) were collected in the upper part of Site U1467 from to 84 me302 m core depth below sea floor (CSF-A). Specimens were collected from azimuthally-oriented APC cores.
Specifications Table   Subject Earth

Value of the Data
Raw and analysed dataset present anisotropy of isothermal remanent magnetization (IRM) of sediments from IODP Site U1467 dated with geomagnetic polarity reversal sequence, which support the interpretation of the related research article [1] and could be useful to other researchers to understand the paleo-oceanography and the monsoon dynamics during the early Pliocene. IRM was acquired in a set of pilot specimens with 12 stepwise increasing fields from 0.03 T to 1 T, induced using a ASC pulse magnetizer and measured with a 2G-Enterprise, superconducting DC-SQUID magnetometer.
Natural remanent magnetization was measured using a 2G-enterprise DC-SQUID magnetometer at the and progressively demagnetized in alternating field up to the maximum field of 100 mT according to a standard paleomagnetic procedure. Characteristic magnetization were calculated using the principal component analysis [2] and the PuffinPlot software [3]. Median destructive field was computed from the alternating field demagnetization of NRM.
Anisotropy of IRM was induced in a field of 20 mT. IRM was measured and then AF demagnetized using a tumbling 2G AF-demagnetizer at a maximum field of 80 mT, before inducing the magnetization in the next axes. IRM was induced along 6 different axes and each axis was measured twice along opposite directions for a total of 12 measurements in each specimen. The intensity IRM was measured with a JR-6 spinner magnetometer. The anisotropy tensor and the directions of the principal IRM axis I i (i.e., the eigenvectors of the AIRM tensor) were computed from the remanent magnetization using the AGICO software Anisoft42.
Flow directions is inferred after recognising the pattern of each specimen by comparing the angle q between the direction of the magnetic lineation I 1 and the plunge of foliation plane. If the q < 35 the pattern is considered flow-aligned and the flow is taken equal to declination of the I 1 axis in the direction of the foliation imbrication. If q 55 the pattern is consider flow-transverse and the flow is the declination of I 1 e 90 in the direction of the foliation imbrication. The intermediate case (35 < q 55 ) is handled by taking directly the imbrication direction of the foliation plane as the flow direction.