根据砾石钙膜纹层的明暗度测年是沉积物年代测定的一种新的思路.本文阐述了用扫描仪对砾石钙膜切面直接进行高分辨率扫描,继而通过......

城门山铜矿中，侵入到花岗闪长岩中的石英斑岩，其中Ｒｅ－Ｏｓｉ法同位素测年结果为１４０×１０＾６ａ，进而确定了该区二次岩浆侵入活动时间相隔约１０×１０＾６ａ在这期......

Accurately measuring inspection time (IT) with computers requires several considerations. They are: 1) Screen redraw per......