ERSC 3P12 Lecture Notes - Lecture 9: Complement Component 5A, North Pole, Outer Core
22 May 2016
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Document Summary
A fundamentally important means of global correlation on land and in the oceans; but polarity change essentially a binary signal so best used in conjunction with other chronostratigraphic indicators. If sedimentation is known to be continuous and of even rate, magnetostratigraphic record reads as a. Bar code each polarity chron is of a unique duration. Four youngest polarity zones are named for scientists important in founding the field: The reversal process takes only about 5000 years or less, so very precise at least at boundaries. Magnetostratigraphic, and geochronologic terms apply as for other time-dependent rock properties. Polarity reversals are marked by zones of transitional declination often several kyr duration. Excursions ( events ) may also occur, 3 6 kyr duration: good for detailed correlation, but difficult to detect. 5. 3 ma, nomenclature uses names and alphanumerical code. 5. 3 ma, nomenclature is exclusively alphanumerical, hierarchical, and infinitely expandable. Initially based on magnetic anomaly numbers on the sea floor!
