【摘要】 取自华北临清拗陷深钻井中的磷灰石,其裂变径迹年龄从井浅部到底部递减,年龄由80Ma 减到1Ma。径迹发生退火的温度范围在75—127℃,比从实验室的退火结果并外推到距今10—30Ma 时对应的温度范围要窄得多。磷灰石中古裂变径迹的长度也随井温升高而减小,而磷灰石古径迹退火的各向异性却随井温升高而增大。更多还原

【Abstract】 Fission track ages of apatite from a deep drill-hole in Linqing Basin decrease from about 80 Ma to 1 Ma near the bottom of the hole. Track fading occurs between 75-127℃, a narrower temperature interval than predicted from laboratory annealing studies for the estimated heating time of 10-30 Ma.With increasing down-hole temperature, average track lengths also decrease, however, annealing anisotropy of fission tracks in apatite increases.更多还原