REPORTS Fission-Track Ages and Track-Annealing Behavior of Some Micas: R. L. Fleischer et al. 349 Geomagneti Polarity Epochs: A . Cox, R. R. Doell, G. . Dalrymple . .. G.ib 35 High-Pressure Metallic Indium Telluride: Preparation and Crystal Structure: C. B. Sclazr, L. C. Carri.son, C. M. Schwartz .................352 Cretaceous Fossils Collected at Johnson Nunatak, Antarctica: i. C. B ehrendt a...

It is known that high-energy fission products create serious damage in the crystal structure of nuclear fuel ceramics (UO2), leading to swelling and degradation of thermal properties. The damage process, being particularly important in the high-energy region, is investigated in this study. Cerium dioxide, CeO2, is one of the ceramics that have the same (fluorite) structure as UO2 and also a sim...

The age of breakup which formed the Central-North Atlantic has been debated for many decades and is still subject to debate: from ca. 150 Ma 110 Ma. To address this issue, we have carried out a thermochronological study eastern margin rifted Iberia-Newfoundland sector. New apatite fission-track (AFT) data acquired on samples footwall (Variscan basement) one sample (Triassic Lusitanian Basin) ha...

Thermochronology studies carried out in crystalline rocks on the South America passive margin reveal distinct cooling patterns along coast. While most of presents syn-to post-rift final exhumation, region between parallels 29° and 35° S primarily pre-rift exhumation. This stretch coast corresponds to Uruguay southern Brazil, where Rio de La Plata Craton Dom Feliciano Belt occur. Previous area s...