Géologie de la région de Saveh (Iran) : contribution à l'étude du volcanisme et du plutonisme tertiaires de la zone de l'Iran central .

The Saveh region covers an area of 15000sq. kms. west of Great Salt Desert of Central Iran, and is situated 130 kms S-E of Tehran. It belongs to the mountain-range stretching NW-SE through Iran; running parallel to the Zagros range, and forms part of the Zone of Central Iran. It is limited to the North by the folded belt of Alborz, whereas in the South it shows certain features which have been shown by us to have close affinity to the Zone of Sanandaj-Sirjan. Structurally, the region finds itself in a zone where structural directions of the Central Iran range change from N 130° E o N l00°E. Over a poorly exposed anty-tertiary basement rocks, (that are metamorphic in the S-W and sedimentary in the West & N-W), are exposed the important volcanic and sedimentary series of tertiary age, that have their lower layers cut by the intrusive plutonic rocks. The igneous rocks, with which we are here particularly concerned, characterize five successive volcanic and plutonic events. Like eIsewhere in Iran, the most important volcanic activities have been during Eocene times.La région de Saveh appartient dans sa presque totalité à la Zone de l'Iran Centra!. Nous y avons toutefois distingué, dans la partie sud-ouest, une zone présentant les caractères de la Zone de Sanandaj-Sirjan que nous appelons Zone de Saman. La Zone de Saman, prolongement oriental de la Zone de Razan ( Thèse de M. Bolourchi 1975), vient former un coin dans la Zone de l'Iran Central, limité au Nord par la faille d'Avaj (Bolourchi 1975) et au Sud par la faille de Pavan, encore appelée "Indes Fault" plus au Sud. La Zone de l'Iran Central est caractérisée par son magmatisme tertiaire, et surtout par son volcanisme éocène. Amidi ( thése 1975), lui attribue le nom de Zone de Tabriz-Torbat-JaZ Murian, provinces situées à ses extrémités. La tectonique cassante y est la règle et la carte de l'Iran au 1/2 500 000 montre une mosaïque de blocs séparés par des failles. La Zone de Sanandaj-Sirjan, au contraire des précédentes, montre une série métamorphique épaisse. Les différences essentielles avec les zones précédentes sont les suivantes: - existence d'une phase plutonique importante à la fin du Mésozoïque; - plusieurs phases de métamorphisme anté-tertiaires (paléocimmérienne, Sabzehei 1974 - laramienne, Berberian 1972); - faible importance des formations tertiaires

Trichodysplasia spinulosa polyomavirus infection occurs during early childhood with intra-familial transmission, especially from mother to child

International audienceTo get new insights into the distribution and modes of acquisition of trichodysplasia spinulosa polyomavirus (TSPyV) infection, we performed a seroepidemiological study in two populations from Cameroon. Our results suggest that TSPyV infection occurs, through close contacts, during early childhood with intra-familial transmission, especially from mother to child

Merkel cell polyomavirus infection occurs during early childhood and is transmitted between siblings

International audienceMerkel cell polyomavirus (MCPyV) is thought to be the etiological agent of Merkel cell carcinoma, but little is known about its distribution and modes of transmission. We conducted seroepidemiological surveys in more than 1000 individuals, from two populations from Cameroon. Overall MCPyV seroprevalence was high in both populations (>75% in adults). Data from the first population, comprising mainly children, indicated that MCPyV infections mostly occurred during early childhood, after the disappearance of specific maternal antibodies. Results from the second family-based population provided evidence for familial aggregation of MCPyV infection status. We observed significant sib-sib correlation (odds ratio=3.42 [95% CI 1.27-9.19], p=0.014), particularly for siblings close together in age, and a trend for mother-child correlation (OR=2.71 [0.86-8.44], p=0.08). Overall, our results suggest that MCPyV infection is acquired through close contact, possibly involving saliva and/or the skin, especially between young siblings and between mothers and their children