The Kamikatsura event and the Matuyama–Brunhes reversal recorded in lavas from Tjörnes Peninsula, northern Iceland

Demise of the rapid-field-change hypothesis at Steens Mountain: The crucial role of continuous thermal demagnetization

“…By 'low-temperature' they simply meant low enough that oxy-exsolution of grains to form alternating lamellae of magnetite and ilmenite is suppressed, but still occurring during cooling of the flow in their interpretation. In addition, as reported by Heller and Petersen (1982) in the Olby flow and Camps et al (2011) in some Icelandic basalts, we have also observed a few instances of grains in flow B51 with lamellae indicating minor oxy-exsolution coexisting with both pristine and modestly low-temperature oxidized titanomagnetite grains.…”

“…The same appears to be true for all the samples except for the two closest to the base and to the top of the flow, as shown by Ms-T cycles performed in the VFTB on eleven samples spanning flow B51 (Supplemental Figure S-1). They again reveal varying amounts of phases with Curie temperatures around 100-150 • C, 400-500 • C, 500-580 • C and show distinct irreversibility beginning between 300 and 400 • C. Similar two-and sometimes three-Curie temperature assemblages have been reported in other studies of basalt flows (e.g., Camps et al, 2011).…”

Archeointensities in Greece during the Neolithic period: New insights into material selection and secular variation curve

“…8b). A quantitative estimate of this process can be done by means of the z parameter (Camps et al, 2011). Moreover, several samples yielded an important secondary component (Fig.…”

Authigenic 10Be/9Be ratio signatures of the cosmogenic nuclide production linked to geomagnetic dipole moment variation since the Brunhes/Matuyama boundary

“…Interval XXII corresponds to a 10 Be overproduction episode (1.4‐fold increase) covering a long‐lasting interval in core MD90‐0961, peaking at 839 ka. This episode is associated with GDL u in the SINT‐2000 and PISO‐1500 records and might be related to a geomagnetic instability dated at 822.2 ± 8.7 ka at La Palma (Canary Islands) [ Singer et al , ] or to the Kamikastura excursion recorded in Icelandic lavas and dated at 862 ± 51 ka [ Camps et al , ].…”