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Remanent magnetization of rocks of latest Cretaceous and earliest Tertiary age from drill core at York Canyon, New Mexico

By
Eugene M. Shoemaker
Eugene M. Shoemaker
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Charles L. Pillmore
Charles L. Pillmore
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Edward W. Peacock
Edward W. Peacock
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Published:
January 01, 1987

At the end of 1980, seven complete cores were recovered from a 30-m (100-ft) interval in the Raton Formation at York Canyon, New Mexico. The interval cored spans the palynologically defined Cretaceous-Tertiary boundary, which is marked by a distinctive noble metal–bearing claystone in the Raton basin. Azimuthal orientation of the cores can be recovered both from the average directions of the most stable components of the remanent magnetization, with a root mean square error of 28°, and from the average direction of secondary components of magnetization removed by thermal and alternating field demagnetization, with a root mean square error of 33°. The natural remanent magnetization of about 95 percent of the core is dominated by a secondary normal polarity component. Polarity of the characteristic magnetization of each core, interpreted from 12 to 14 samples per core run, is reversed. No evidence of normal polarity characteristic magnetization was found in the 30-m (100-ft) interval sampled. The characteristic magnetization probably is a depositional remanent magnetization acquired during chron 29r. The noble metal–bearing boundary claystone in the Raton basin is interpreted to be part of a synchronous global deposit laid down at the end of the Cretaceous period.

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Contents

GSA Special Papers

The Cretaceous-Tertiary Boundary in the San Juan and Raton Basins, New Mexico and Colorado

James E. Fassett
James E. Fassett
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J. Keith Rigby, Jr.
J. Keith Rigby, Jr.
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Geological Society of America
Volume
209
ISBN print:
9780813722092
Publication date:
January 01, 1987

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