IGPP is pleased to invite you to join its Spring 2022 Seminar Series presentation featuring Norwegian University of Science and Technology (NTNU)'s Suzanne McEnroe.
IGPP is pleased to invite you to join its Spring 2022 Seminar Series presentation featuring Norwegian University of Science and Technology (NTNU)'s Suzanne McEnroe. Dr. McEnroe's talk, "Microstructures in Minerals and Magnetic Anomalies" will be available via Zoom on Tuesday, June 7, 2022, starting at 12:00pm. Zoom: https://ucsd.zoom.us/j/91939223532?pwd=ZWtadCtZZnZBam1TQWhlK0dXeXh6Zz09 Password: SMM
Time: 12:00 pm, Pacific Time
Location: Munk Conference Room and Zoom
Note: This meeting will be recorded. Please make sure that you are comfortable with this before registering.
Abstract: Magnetic anomalies provide a primary source of information on magnetic oxides at all length scales. In magnetic surveys the amount and type of information obtained is related to the distance from the source to the magnetometer. Today satellites are used to map the Earth's magnetic field and explore lithospheric magnetic anomalies. To understand better the magnetic signal from deep-seated rocks, we need to explore the sources and nature of the magnetic mineralogy from these rock bodies that are now exposure at the surface. Here a major challenge is to infer the temperature and pressure conditions when the oxides acquired (locked in) their magnetization. At a closer scale aeromagnetic surveys map crustal structures and rock bodies with highresolution surveys, and with the development of drone magnetic surveys the resolution is increasingly close to that of a ground magnetic survey.
Until recently we relied on bulk magnetic properties to estimate the magnetization of a rock body. Now with the advent of scanning magnetic microscopy (SMM) we can evaluate the contribution of individual magnetic minerals to the anomaly, and further estimate the stability of magnetization. Using SMM also allows for evaluating how different microstructures affect the magnetic response of these minerals. This talk aims to explore what we have learned at the mineral scale, and how this helps us interpret magnetic anomalies at multiple scales.