One of our sites was located in the Serra della Fastuca fall deposit, produced by the first explosive event of the eruptive cycle.
The mineralisation is hosted in a Variscan thrust sheet by strata of the Late Carboniferous (~309 ± 3 Ma) Picos de Europa limestone–shale formation.
These rocks represent the main stage of the rift-related magmatism.
All younger sedimentary and igneous suites exposed on the Keweenaw peninsula (the Copper Harbor conglomerate, LST, etc) have normal polarity magnetization.
The record of the strength and direction of Earth’s magnetic field (paleomagnetism, or fossil magnetism) is an important source of our knowledge about the Earth’s evolution throughout the entire geological history.
This record is preserved by many rocks from the time of their formation.