NRM

{
  "id": "MLC-T-OAG-002572",
  "term": "NRM",
  "field": "Oil and gas",
  "definition": "The total permanent magnetization present in a rock or sediment sample as collected, made up of a primary component locked in at formation and often one or more later overprints. The primary part is acquired as a rock cools through its blocking temperatures or as magnetic grains settle and align in sediment. Paleomagnetists isolate it by progressive demagnetization to recover ancient field directions.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/nrm/"
}