Les Volcans Dôméens du Néogène de la Région de Qom (Iran Central). Essai de Classification de l’Activité Volcanique Dôméenne

Some domean volcanoes built by acidic to intermediate lavas are described. They were intruded, probably in Pliocene, into the neogenic volcano-sedimentary formations of the volcanic Tabriz — Bazman Zone (Central Iran). Some of them are intrusive domes which certainly did not reach the existing topographical surface when emplaced; others are extrusive domes which exhibit some interesting featuresviz.: hypogenous emplacement of the Suleghan dome, typical ring shape of the Dastjerd dome, etc. A provisional classification of domean volcanism in proposed in conclusion.     

Active regions and the large scale flow in the solar photosphere

Summary Statistics on sunspot leaders and followers in active regions are derived from the 50 years of Greenwich records 1905–1954. The results are combined with the probable structure of large scale solar eddies as synthesized from various relevant pieces of information. It is found that active regions tend to be located in anticyclonic ridges of the large disturbances. The statistical leader and follower populations are further subdivided, each into new and old spot classifications. The new leaders, especially, show motions different from those of other spots, suggesting the presence of a life cycle for the large disturbances. It is found that the divergence and vorticity are positive and anticyclonic, respectively, for the new active regions, the former quantity being numerically larger than the latter in this case. Various possible implications of the material are discussed.     

Tectonic interpretation of paleomagnetic results from the Upper Devonian griotte of the Montagne Noire, southern France

The Devonian (Famennian) griotte acquired its magnetization during and subsequent to emplacement during the Late Carboniferous-Early Permian. The absence of normal secondary components suggests that tectonic emplacement postdates the period of frequent Carboniferous reversals, that is post-Westphalian A and presumably after the onset of the Kiamian quiet period. A remanence attributed to the Permian, as found in the south of France, has been isolated in a few samples; the remainder of the samples show a stable magnetization with a great circle distribution which passes through the zone of Permian directions.