Palaeomagnetism of the British carboniferous system

Thermal Demagnetization of some Carboniferous Lavas for Palaeomagnetic Purposes

“…The axis of magnetization also agrees well with those from the British Carboniferous exposures at Clee Hill (200" East and North, 15" down) and at Tideswelldale (218", 36" down) where baked contact materials were available as corroborating evidence (Everitt, 1959 and1960). Other British Carboniferous rocks agree less well (Clegg et al 1954, Blundell 1957, Everitt 1960, BelshC 1957, Everitt and BelshC 1960.…”

“…The mean direction of 15.9 "E, and 28.5" up agrees well with the Carboniferous direction of 20 "E,27' up arrived at by Everitt and BelshC (1960). Reference should be made to that paper for a discussion of field tests for stability and also for an analysis of certain other apparently conflicting results in rocks of Carboniferous age.…”

“…L. Wilson and C. W. F. Everitt and BelshC (1960) that the normal magnetizations in the neighbouring lavas were stable.…”

“…Along this axis both normal and reversed directions occurred; the normal and reversed lavas lying in successive groups. Most of these results, together with preliminary thermal cleaning measurements on a few lavas, were published by Everitt and BelshC (1960). In that paper several arguments were put forward mainly based on field evidence which suggested that the mean direction of 20" east, 27" up was the original field direction first recorded by these lavas.…”

On the Magnetic Age of some Devonian Lavas from Devonshire

“…Anderson and Dunham (1953) suggested that the alteration is due to the in situ oxidation of pyrite and chalybite and to the introduction of iron oxides along joints and pore spaces. Palaeomagnetic evidence for the remagnetization of older rocks due to oxidation during the Permo-Triassic periods has been described by Everitt and Belshe (1960). These authors found that many of the Carboniferous sediments from the Pennine area exhibited anomalous directions of magnetization which are best explained as the result of oxidation and remagnetization during the Triassic.…”