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• W2000711084 abstract "Thermal histories on seven Brazilian apatites were obtained by fission track analysis using Monte Carlo simulations. The apatites were collected from two distinct geotectonic provinces. One group, originated from São Francisco craton, represents a typical cratonic domain with Proterozoic and Eopaleozoic rocks and yielded Permo-Triassic ages (counted since the instant when temperature was low enough so that the damage produced by fission tracks in apatite started to be preserved). The common thermal history accepted by all samples of this group is a linear cooling from ~90 to ~25 °C for the last 240 Ma, in agreement with present day thermal gradient and denudation rates. The other group, from Mesozoic alkaline-carbonatite complexes, in central and southeastern Brazil, yielded Cretaceous ages, close to those of the intrusions. For the samples of central Brazil, fission track analysis suggests a slow cooling from ~95 ° to ~85 °C between 90 and 60 Ma ago, followed by a faster cooling from ~85 ° to ~27 °C for the last 60 Ma. Otherwise, two trends exist for the samples of southeastern Brazil. The primary one is an increase in temperature from ~75 ° to ~95 °C, which occurred between 140 and 60 Ma ago. In this period, there is also another trend: a cooling from ~100 ° to ~80 °C. However, both trends are followed by a common thermal history during the last 60 Ma: a cooling from approximately ~80 ° to ~25 °C. Histórias térmicas de siete apatitas Brasileras fueron obtenidas por analisis te trazas de fision, usando simulaciones de Monte Carlo. Las apatitas fueron colectadas de dos provincias geotectónicas diferentes. Un grupo originado en el Craton de San Francisco, representa un típico dominio cratónico con rocas Proterozoicas y Eopaleozoicas producidas en edades Permo-Triásicas (contados desde el instante en que la temperatura fue suficientemente baja para que los daños produzidos por fision en apatita comenzaran a ser preservados). La história térmica comun aceptada por todas las muestras de este grupo es un enfriamiento lineal de ~90 a ~25 °C para los Ultimos 240 Ma., en concordancia con el gradiente térmico y velocidades de denudacion actuales. El otro grupo de complejos Mesozoicos alcalino-carbonatito, en el centro y sudeste de Brasil produzidas en edades Cretácicas, que encierran estas intrusiones. Para las muestras del centro de Brasil, el análisis de trazas de fision sugieren un enfriamiento lento de ~95 a ~85 °C entre 90 y 60 Ma. atras, seguido por un enfriamiento rápido de ~85 a ~27 dgC en los últimos 60 Ma. Por otro lado existen dos tendencias para las muestras del sud-este de Brasil. La primera es un incremento en temperatura de ~75 a ~95 °C, la cual ocurrio entre 140 y 60 Ma. atras. En este período tambien existe otra tendencia: un enfriamiento de ~100 a ~80 °C. No obstante ambas tendencias siguen una história térmica comun durante los últimos 60 Ma.: un enfriamiento de aproximadamente ~80 a ~25 °C." @default.
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• W2000711084 date "1997-05-01" @default.
• W2000711084 modified "2023-10-03" @default.
• W2000711084 title "Fission track analysis of apatites from São Francisco craton and Mesozoic alcaline-carbonatite complexes from central and southeastern Brazil" @default.
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• W2000711084 doi "https://doi.org/10.1016/s0895-9811(97)00020-5" @default.
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