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Paleomagnetic standards were provided by Lisa Tauxe to confirm instrument measurements are correct. The standards were prepared specifically for the SRM although they can be used in the other instruments as well. These standards were prepared and measured at S10 Sripps Institute for Oceanography in California. Standards are kept in a cardboard box (figure 1) and stored in the Pmag lab in the smaller MU metal shielding chamber (figure 2).
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The Samples are oriented as if they were taken from an archive half. This means that the arrow etched into the cube points in the negative Z (i.e. towards the top of the core) on the ARCHIVE HALF SPLIT FACE (not the working half split face as a cube normally collected onboard would be). This can be confusing as most of the time, discrete samples would be collected from the working half. Be sure to keep this orientation in mind when loading into the instruments. See Figure 3 for sample orientation arrows
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When measuring the standards in the SRM, install the discrete sample tray and set up your measurement preset to reflect a discrete J-Cube collected from the archive half. For sample shape select Discrete J-Cube. Face orientation should be Top and the Arrow Orientation (-Z) should be set to Away. Be sure to select Archive Half under From Section. In Dimensions, set the sample area to 71.0 cm2. Although this says sample area and the unit is an area unit, we are telling IMS what the volume of the J-cube is (i.e. 71.0 cm3). Name your measurement preset something useful such as Discrete Archive. More information on setting up a sample preset can be found in the SRM user guide.
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