Paleomagnetism of Eocene plutonic rocks, Matanuska Valley, Alaska

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1988)016<0618:POEPRM>2.3.CO;2· OSTI ID:6821850

Stamatakos, J A; Kodama, K P; Pavlis, T L

Paleomagnetic analysis of 88 samples from 14 sites in four Eocene sills in the Matanuska Valley, south-central Alaska, yields a paleomagnetic pole at lat 72.9/sup 0/N, long 281.1/sup 0/E, precision parameter (k) = 15.4. The paleolatitude of this result suggests that this part of the Alaskan crust was at or near its present position relative to North America in the middle Tertiary. This pole also indicates that the region has been rotated clockwise by approximately 50/sup 0/. These results can be explained by local block rotations of fault-bounded blocks in response to regional right-lateral shear along both the Castle Mountain and Border Ranges faults.

• Research Organization: Lehigh Univ., Bethlehem, PA (USA)
• OSTI ID: 6821850
• Journal Information: Geology; (United States), Journal Name: Geology; (United States) Vol. 16:7; ISSN GLGYB
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580100* -- Geology &amp; Hydrology-- (-1989)
ALASKA
CENOZOIC ERA
CONTINENTAL CRUST
EARTH CRUST
EOCENE EPOCH
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
IGNEOUS ROCKS
MAGNETISM
MOTION
NORTH AMERICA
PALEOMAGNETISM
PLUTONIC ROCKS
ROCKS
ROTATION
SAMPLING
SEDIMENTARY BASINS
TERTIARY PERIOD
USA
VALLEYS