Archaeomagnetic dating limitations of internal control,
Now this volume presents the first book-length treatment of its theory and methodology in North American archaeology. Geologists collect paleomagnetic samples by drilling and removing a core from bedrock, a lava flow, or lake and ocean bottom sediments.
Inquire Requests The University of Arizona Press is proud to share our books with booksellers, media, librarians, scholars, and instructors. Magnetism occurs whenever electrically charged particles are in motion. Once the paleodirections of enough independently dated archaeological features are determined, they can be used to compile a secular variation record for a particular region, known as an SVC.
Robert Dubois introduced this new absolute dating technique to archaeology as archaeomagnetic dating. In addition, the feature needs to be in an area for which a secular variation curve SVC exists. The magnetic declination at any given time can be frozen into a clay formation that contains magnetite and is heated above the Curie point.
Archaeologists collect archaeomagnetic samples by carefully removing samples of baked clay from a firepit using a saw.
Eight to twelve samples are collected and sent to a laboratory for processing. A nonmagnetic, cube-shaped mold aluminum is placed over the sample, and it is filled with plaster. However, each time the firepit is reheated above the Curie point while being used to cook something, or provide heat, the magnetization is reset.
Each of the samples is measured in a spinner magnetometer to determine the thermal remanent magnetism of each sample. Additional data points from archaeomagnetic samples with corresponding dating techniques such as tree ring dating or carbon dates, help refine the regional curves.
Any changes that occur in the magnetic field will occur all over the world; they can be used to correlate stratigraphic columns in different locations. This core is taken back to a laboratory, and a magnetometer is used to measure the orientation of the iron particles in the core.
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