Supposed or potential Devonian igneous rocks in the accretionary complex of southern Chile were investigated using sensitive high-resolution ion microprobe U-Pb dating of zircon, with Hf- and O-isotope analyses of selected grains. Ages of 384 +/- 3 and 382 +/- 2 Ma are confirmed for two igneous bodies (another having been previously dated at 397 +/- 1 Ma). Detrital zircon ages in the host rocks, some associated with Devonian marine fossils, indicate maximum possible sedimentation ages of c. 330 - 385 Ma. Devonian ages of 391 +/- 10 and 374 +/- 3 Ma for plutonic rocks at the western edge of the North Patagonian Massif are somewhat older than those of orthogneisses in the western flank of the Andes near Chaiten (361 +/- 7 and 364 +/- 2 Ma). O and Hf isotopes indicate that the Devonian intrusions in the accretionary complex crystallized from mantle-derived magmas, whereas those in the North Patagonian Massif show a strong crustal influence, corresponding to oceanic and continental margin subduction environments of magma genesis, respectively. Devonian zircon provenance in the accretionary complex was from the North Patagonian Massif and not from the mantle-derived intrusions, suggesting that the accretionary complex formed an integral part of the Gondwana margin during Devonian-Carboniferous timesProject Fondecyt 113022

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Resumen Se determinaron las poblaciones linfocitarias B y T mediante las técnicas de roseta EAC y E respectivamente, en sangre periférica de bovinos normales, positivos serológicos y hematológicos a la leucosis enzootica bovina y en animales que sólo presentaron anticuerpos circulantes contra el virus BLV. El diagnóstico hematológico se realizó en base a la presencia de linfocitosis persistente y el serológico por la prueba de inmunodifusión en gel de agar. Los bovinos linfocitóticos y con anticuerpos circulantes presentaron un aumento significativo de linfocitos B (61,51%) y una disminución de linfocitos T (10,93%) en relación a los normales (24,97% de linfocitos B y 16,52% de LT). Los bovinos sólo positivos serológicos a la leucosis enzoótica, presentaron poblaciones de linfocitos B (28,13%) y T (11,01%) cuantitativamente normales, concluyéndose que estos animales no tendrían la misma susceptibilidad al virus en cuanto a la proliferación de linfocitos. Zusammenfassung Lymphozytenpopulationen im peripherischen Blut von normalen Rindern und anderen mit enzootischer lymphatischer Leukose Im peripheren Blut von normalen Rindern, serologisch und hämatologisch positiven Tieren auf die enzootische Rinderleukose und bei Tieren die lediglich zirkulierende Antikörper gegen das BLV aufwiesen wurden die Lymphozytenpopulationen B und T mittels den Rosettentechniken EAC bzw. E ermittelt. Die hämatologische Diagnose wurde aufgrund der Präsenz von persistierender Lymphozytose und die serologische Diagnose mit der Immundiffusion in Agargel erstellt. Die lymphozytischen Rinder und diejenigen mit zirkulierenden Antikörpern wiesen eine signifikante Zunahme der B‐Lymphozyten (61,51%) sowie eine Verringerung der T‐Lymphozyten (10,93%) mit Bezug auf die normalen (24,97% B‐Lymphozyten und 16,52% T‐Lymphozyten) auf. Die nur serologisch positiven Rinder auf die enzootische Leukose zeigten Populationen von quantitativ normalen B‐Lymphozyten (28,13%) und T‐Lymphozyten (11,01%). Dabei kommt man zu dem Schluß, daß diese Tiere nicht die gleiche Suszeptibilität auf das Virus bezüglich der Lymphozytenproliferation hätten. Summary Lymphocyte populations in peripheral blood of normal cattle and cattle with enzootic lymphatic leucosis In the peripheral blood of normal cattle, cattle that were positive serologically and haematologically for enzootic leucosis, and cattle which were merely shown to have circulating antibodies against EBL, the lymphocyte populations B and T were determined by the EAC and E techniques. The haematological diagnosis was based on the presence of a persistent lymphocytosis and serological diagnosis was by immunodiffusion in agar gel. Lymphocytotic cattle and cattle with circulating antibodies showed a significant increase in B‐lymphocytes (61.51%) and a reduction in T‐lymphocytes (10.93%), compared to normal cattle which had 24.97% B‐lymphocytes and 16.52% T‐lymphocytes. The cattle that were merely positive serologically for EBL had quantitatively normal B‐lymphocyte (28.13%) and T‐lymphocyte (16.52%) values. The conclusi...