TIMING OF QUATERNARY GEOMAGNETIC REVERSALS AND EXCURSIONS IN VOLCANIC AND SEDIMENTARY ARCHIVES

We review the ages of Quaternary magnetic polarity reversals and magnetic excursions. Radioisotopic ⁴⁰Ar/³⁹Ar dating of reversals and excursions using multi-collector mass spectrometers, ultra-low background, laser-based incremental heating methods, and using an ACs standard age of 1.1864 Ma (Jicha et al., 2016) or FCs standard age of 28.201 Ma (Kuiper et al., 2008) have brought ⁴⁰Ar/³⁹Ar ages of reversals and excursions into close correspondence with astrochronological ages based on the correlation of d¹⁸O data to LR04 (Lisiecki and Raymo, 2005) and, in a few cases, correlation to ice-core chronologies. Ages of two polarity reversals, the Matuyama-Brunhes boundary and base Olduvai, are at odds with ages given in popular geomagnetic polarity timescales. Sedimentary records of the Laschamp and Iceland Basin excursion are numerous and widespread, and attest to global manifestation and global synchronicity of these excursions. Records of other Quaternary excursions are less numerous. The Blake excursion (~115 ka) has been recorded in North Atlantic sediments, Chinese loess, Indian Ocean volcanics, and Spanish speleothems. The Santa Rosa excursion (~930 ka) has been recorded in North Atlantic and Phillipine Basin sediments, as well as in volcanic rocks from New Mexico and Galapagos. The Punaruu excursion (~1100 ka) has been observed in sediments from the North Atlantic and California Margin as well as in volcanic rocks on Tahiti. Uniformity of individual excursion ages, using astrochronological, ⁴⁰Ar/³⁹Ar and U-Th methods, argues for synchronous global manifestation of excursions, strengthening the usefulness of magnetic excursions (and reversals) in Quaternary stratigraphy.