Data report: temporal variation in natural remanent magnetization observed for Pacific plate basement rocks: compilation from legacy data and new paleomagnetism and rock magnetism data from seafloor basalts cored during Expedition 320/321
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Previous rock magnetism data compilations from oceanic basement rocks show that intensity
of natural remanent magnetization (NRM) decays with age from 0 to 30 Ma and then increases
prior to 40 Ma. This temporal trend in NRM is regarded as tentative. One of the problems
seems to be that these compilations were made from NRM data without regard to the
oceanic plates where the samples were collected. As a case study, we have compiled
basement rock NRM data from Deep Sea Drilling Project and Ocean Drilling Program sites
on the Pacific plate only. The present compilation results in 103 NRM data points
for the 0–50 and 110–170 Ma intervals. We also conducted rock magnetism and paleomagnetism
studies on basement rocks recovered from five sites drilled during Integrated Ocean
Drilling Program Expedition 320/321 in order to provide new data. These samples yield
13 new NRM data points for the 24–50 Ma interval.