Chron C33r paleomagnetic pole for the Pacific plate - art. no. 1873

摘要

1] A Pacific plate paleomagnetic pole was calculated for chron C33r ( 79 - 83 Ma) using data from Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) basalt and sediment cores. Six colatitude data were combined with four declination data, one from basalt samples oriented by magnetic overprint direction and three from seamount magnetic anomaly inversions corrected for induced field bias. The resulting pole is located at 72.3degreesN, 341.7degreesE (95% confidence ellipse: major semi-axis, 10.1degrees; minor semi-axis, 5.6degrees; major semi-axis azimuth, 91degrees) and is indistinguishable from a published pole calculated using basalt samples from ODP Site 884. The C33r pole implies that prior poles of this age, based on seamount anomaly inversion data, are inaccurate. It changes the shape of the Pacific apparent polar wander path (APWP) and implies rapid polar motion before C33r followed by a polar standstill. [References: 19