34 research outputs found
Recherches sur L' origine, la Distribution, les Cractères Cytologiques et les Propriétés Biologiques des Histiocytes et des Macrophages par la Méth
492 tr. ; 24 cm
Histoautoradiographie et métabolisme cellulaire des acides nucléiques (ADN et ARN)
info:eu-repo/semantics/publishe
contribution to the study of nuclear total proteins and DNA during the mitotic cycle in fibroblasts cultivated in vitro and in Ehrlich ascites cells
Histochemischer Nachweis reduzierender Substanzen durch die Berliner-Blau-Reaktion in metall- und chinongesch�digten Pilzsporen
Beobachtung der Bildung einer zweikernigen Zelle bei der Wirkung von Adrenalin auf in vitro gez�chtete Fibroblasten
Relationships between granitoids and mineral deposits: three-dimensional modelling of the Variscan Limousin Province (NW French Massif Central)
International audienceMultidisciplinary three-dimensional modelling, involving geophysical, structural and geochemical data, has been used to study the relationships between magmatism, tectonics, fluid circulation and mineralisation in the northern Limousin, and to provide P–T–Z–t paths constrained by the available dating. The ore deposit occurrence displays little spatial relationship with granites emplaced in the 360–320 Ma period, probably because the low global permeability and tectonic regime did not allowed vertical fluid exchanges to be established. In contrast, the change in the tectonic regime induced by the delamination of the lower lithosphere (320–300 Ma), and characterised by the passage to general extension, has played a major metallogenic role. However, the ore deposit processes appear to be specific to each metal. Most of the W-Sn deposits appear to be synchronous with rare metal granites emplacement, at c. 310 Ma, that allowed the focus of fluids of different origins towards the apex of plutons. In contrast, for Au and U, the whole mineralisation process covers several tens of millions of years. It is controlled by the regional tectonic evolution of the Limousin area during the same period, and especially by a rapid exhumation of the ductile crust which occurred in the 310–300 Ma period