Knowledge graph centered on Anisotropy of Magnetic Susceptibility (AMS) with 11 nodes and 20 connections. Top connected: SEM-EDS microanalysis, Post-Depositional Fluid Flow in Jurassic Sandstone, Escalante Canyon, Dominguez Canyon, Magnetic hysteresis measurement.
Method synopsis
Oriented rock cubes are measured for directional magnetic susceptibility to determine fabric orientation and strength. Principal axes and confidence ellipses calculated using Jelinek statistics.
Synthesized from method descriptions across 1 paper using this protocol.
Procedure from a recent peer-reviewed implementation
Hand samples with average dimension of 15 × 12 × 8 cm were collected from the Entrada Sandstone, Wanakah Formation, and Tidwell Member of the Morrison Formation using a rock hammer to obtain fresh surfaces and avoid supergene alteration overprints
Quantities: Hand samples from two sites located 12 km apartDuration: Not specifiedConditions: Outcrop conditions in western Colorado
Equipment: rock hammer, GPS units, magnetic compass
Sample georeferencing and orientation
Geographic orientation of samples was determined using a magnetic compass after correction of magnetic declination (11°E)
Quantities: All hand samples orientedDuration: Not specifiedConditions: Field conditions
Equipment: magnetic compass, GPS units
Specimen preparation for AMS
Several serial 2 cm-thick slabs were cut from hand samples, then 2 cm AMS cubes were cut side-by-side from these slabs to yield about 15 cubic specimen per hand sample. These oriented cubes were measured using the AGICO KLY-4S Kappabridge susceptibility meter
Quantities: About 15 cubic specimens per hand sampleDuration: Not specifiedConditions: Room temperature with applied magnetic field of 300 A/m and frequency of 875 Hz
Equipment: AGICO KLY-4S Kappabridge susceptibility meter